technical committee on multiple burner boilers · pdf file · 2016-04-06technical...

Technical Committee on Multiple Burner Boilers

AGENDA

Salt River Project PERA Club 1 Continential Drive

Tempe, AZ January 14-15, 2014

1. Chair’s welcome, call to order, and opening remarks at 8:00 a.m. CST.

2. Self-Introduction of Committee Members and Guests

3. Approval of Minutes from the February 2013 First Draft meeting in New Orleans, LA. See www.nfpa.org/85next.

4. Staff Liaison Report

A. Committee membership update (For the period Feb. 5, 2013 – Dec 10, 2013)

Name Category Change Date

Thomas J. Murphy M (Alt to B. Basile) Appoint 07/29/2013

Sanda Brumaru SE (Alt to G. Keller) Resign 04/05/2013

George Keller SE (Principal) Resign 04/05/2013

Farshad Hendi SE (Alt to G. Raney) Resign 04/10/2013

Glenn Raney SE (Principal) Resign 04/10/2013

Gary Norman M (Alt to J. O’Rourke) Resign 05/20/2013

(Total Voting Members – 27; M=33%, SE=30%, U=30%; I=7%)

B. Revision Cycle Review and timeline (Attachment A)

5. Old Business (See Also Pre-FD Actions in Attachment C.)

A. Referenced Documents in Fundamentals Chapters. Mr. Switzer will review the documents referenced in mandatory text in subsection 6.6.2

B. Design Pressures Task Group. The scope of the task group is to review section 6.5 and its subparagraphs to determine how the head developed by booster fans in series with ID fans should be addressed. The task group looked at how the various combinations of fans affect boiler/furnace design and considered how NFPA 85 should respond to that. Task group chairman B. Smith submitted several public inputs for consideration by the committee.

http://www.nfpa.org/85next

The task group also came up with other questions, including the following:

i. Current applications have fan capabilities up to 80 in., but the duct work is addressed only in the annex as a consideration. Is it time to establish structural requirements for the duct work?

ii. Does the committee need to review 35 in. limitation to reflect current designs/practices?

iii. The fan requirement is based on “cold, dense air”. Is that a realistic requirement, or should the code reflect typical ambient conditions.

The task group will continue to discuss these new questions for further consideration in the Second Draft meeting. The task group members are B. Smith (chair); D. Evely; J. Frazier; K. Gamble; D. King; J. Lehman; H. Wong; and A. Zadiraka.

C. Annexes B and C (Supervised Manual Systems). A task group was established to discuss this issue further. The task group members are: D. Dressel (chair); J. Eibl ; S. Yates; and A. Zadiraka. In the First Draft meeting, the committee discussed the use and continued need for these annexes, which are not actively maintained by the committee. The annexes address interlocks that are designed to operate with operator supervision. The material is still in use by some chemical and petrochemical companies, and is not covered by any other NFPA document.

6. New Business

A. Review Public Comments on Chapter 6 and Related Annex Material. Review the Public Comments (Attachment B) and revise chapter 6 of NFPA 85 as appropriate.

B. Review BCS-FUN Second Revisions. The committee members are asked to review the actions of the Fundamentals committee (Attachment C) and bring forward any items warranting further discussion.

C. Boiler Enclosure Definition/Purge Times. It has been reported that some boilers are being purged for much longer than 5 minutes because of the volume calculation and the requirement for 5 air changes. This issue was referred to the BCS-MBB committee for further discussion by the Correlating Committee. (NFPA85/AAC Minutes Item 7B)

7. Plasma Arc Igniter. The committee briefly discussed the use of plasma arc igniters, indicating awareness of some installations or planned installations outside of the US. A representative from SmartBurn LLC will make a presentation on this new technology.

8. Other Items?

9. Date/Location of Next Meeting. This concludes the committee work for the Fall 2014 revision cycle. The next meeting will be scheduled as needed.

10. Adjournment.

Attachment A: Fall 2014 Revision Cycle

Process

StageProcess Step Dates for TC

Dates for TC

with CC

Public Input Closing Date* 1/4/2013 1/4/2013

Final date for TC First Draft Meeting 6/14/2013 3/15/2013

Posting of First Draft and TC Ballot 8/2/2013 4/26/2013

Final date for Receipt of TC First Draft ballot 8/23/2013 5/17/2013

Final date for Receipt of TC First Draft ballot ‐ recirc 8/30/2013 5/24/2013

Posting of First Draft for CC Meeting 5/31/2013

Final date for CC First Draft Meeting 7/12/2013

Posting of First Draft and CC Ballot 8/2/2013

Final date for Receipt of CC First Draft ballot 8/23/2013

Final date for Receipt of CC First Draft ballot ‐ recirc 8/30/2013

Post Final First Draft for Public Comment 9/6/2013 9/6/2013

Public Comment closing date 11/15/2013 11/15/2013

Final Date to Publish Notice of Consent Documents (Documents

That Received No Comments)11/22/2013 11/22/2013

Appeal Closing Date for Consent Documents (15 Days) (Documents

That Received No Comments)12/7/2013 12/7/2013

Final date for TC Second Draft Meeting 5/2/2014 1/24/2014

Posting of Second Draft and TC Ballot 6/13/2014 3/7/2014

Final date for Receipt of TC Second Draft Ballot 7/7/2014 3/28/2014

Final date for receipt of TC Second Draft ballot ‐ recirc 7/14/2014 4/4/2014

Posting of Second Draft for CC Mtg 4/11/2014

Final date for CC Second Draft Meeting 5/23/2014

Posting of Second Draft for CC Ballot 6/13/2014

Final date for Receipt of CC Second Draft ballot 7/7/2014

Final date for Receipt of CC Second Draft ballot ‐ recirc 7/14/2014

Post Final Second Draft for NITMAM Review 7/18/2014 7/18/2014

Notice of Intent to Make a Motion (NITMAM) Closing Date 8/22/2014 8/22/2014

Posting of Certified Amending Motions and Consent Documents 10/17/2014 10/17/2014Appeal Closing Date for Consent Documents (15 Days) 11/1/2014 11/1/2014SC Issuance Date for Consent Documents (25 Days) 11/11/2014 11/11/2014

Tech Session Association Meeting for Documents with CAMs 6/22‐25/2015 6/22‐25/2015

Appeal Closing Date for Documents with CAMs (20 Days) 7/15/2015 7/15/2015SC Issuance Dates for Documents with CAMs 8/27/2015 8/27/2015

Comment Stage

(Second Draft)

Tech Session

Preparation

(& Issuance)

Appeals and

Issuance

2014 FALL REVISION CYCLE

Public Input

Stage

(First Draft)

*Public Input Dates may vary according to documents and schedules for Revision Cycles may change. Please check the NFPA Website for the most up‐to‐date information on

Public Input Closing Dates and schedules at www.nfpa.org/document # (i.e. www.nfpa.org/101) and click on the Next Edition tab

Attachment B: Public Comments

Public Comment No. 28-NFPA 85-2013 [ Section No. 6.4.1.1.14 ]

6.4.1.1.14 The mandatory master fuel trip–sensing elements and circuits shall be independent of all other controlelements and circuits.Exception No. 1: Individual burner flame detectors also shall be permitted to be used for initiating masterfuel trip systems.Exception No. 2: Airflow measurement, auctioneered furnace draft, drum water level, and feedwater flowsignals or equivalent signals specified by boiler manufacturer, from the boiler control system shall bepermitted to be used for a master fuel trip, provided all the following conditions are met:

(1) These interlocks are hardwired into the burner management system.

(2) Tripping set points are protected from unauthorized changes.

(3) Any single component failure of these sensing elements and circuits does not prevent a mandatorymaster fuel trip.

Statement of Problem and Substantiation for Public Comment

To accommodate for various types of once-through boiler designs and different operating conditions, recommend leaving the method of meeting the intent of Feedwater Flow Low trip to boiler manufacturer. Some existing methods of detecting Feedwater Flow issues are:1) Loss of all Boiler Feedwater Pumps (BFP);2) Waterwall Outlet Pressure High (possible blockage downstream);3) Waterwall Outlet Pressure Low (possible tube leak downstream);4) Waterwall Outlet Temperature High (Feedwater Flow Low relative to Fuel Flow).5) Pressure differential low between Waterwall Outlet Pressure and Throttle Pressure headers.Alternative parameters such as P, T, dP, and equipment status can be used to detect Feedwater Flow Low as specified by boiler manufacturer.

Submitter Information Verification

Submitter Full Name: SINMING KWONGOrganization: EMERSON PROCESS MANAGEMENT PWSStreet Address:City:State:Zip:Submittal Date: Mon Nov 04 21:52:23 EST 2013

Copyright Assignment

I, SINMING KWONG, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyrightin this Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intendthat I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or anothersimilar or derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority toenter into this copyright assignment.

By checking this box I affirm that I am SINMING KWONG, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature

National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara...

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Figure 6.4.1.2.1 and Table 6.4.1.2.1(a) through Table 6.4.1.2.1(c) show the minimum required system ofinterlocks that shall be provided for basic furnace protection for a multiple burner boiler operated inaccordance with this code.Figure 6.4.1.2.1 Interlock System for Multiple Burner Boiler.

Table 6.4.1.2.1(a) Interlock System for Multiple Burner Boiler

BlockNumber Action

Block 1

Loss of an individual igniter flame shall cause the following actions:(1) Close the individual igniter safety shutoff valve(s) and de-energize the spark(s).(2) Open the vent valve (fuel gas ignition only).(3) Signal the main flame protection system that the igniter flame has been lost.

Block 2a1 High or low igniter fuel gas header pressure shall be interlocked to initiate the tripping ofthe igniter header and individual igniter safety shutoff valves and de-energize sparks.

Block 2a2 Low igniter fuel oil header pressure shall be interlocked to initiate the tripping of the igniterheader and individual igniter safety shutoff valves and de-energize sparks.

Block 2b

Where fuel oil is used for ignition fuel with air or steam atomization, atomizing air or steampressure out of range shall trip the igniter header and individual igniter safety shutoffvalves and de-energize sparks.�Where direct electric igniters are used, blocks 1 and 2 shall not apply. However, themaster fuel trip system shall de-energize sparks and prevent re-energizing until allconditions for light-off have been re-established.

Blocks 3through 13

These blocks represent conditions that initiate the tripping of all main and ignition fuelsupplies through a master fuel trip relay contact(s). The master fuel trip relay(s) shall be ofthe type that stays tripped until the unit purge system interlock permits it to be reset.Whenever the master fuel trip relay(s) is operated, it shall trip all fuel header, burner, andigniter safety shutoff valves and de-energize all sparks and all ignition devices within theunit and flue gas path through master fuel trip relay contact(s).�Master fuel trip relay contacts shall also trip the fuel oil system circulating andrecirculating valves. If the design of the fuel oil supply system is such that backflow of fueloil through the recirculating valve is inherently impossible or positively prevented, thisvalve shall be permitted to be manually operated and shall not be required to beinterlocked to close automatically on a master fuel trip.


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Public Comment No. 50

BlockNumber Action

Table 6.4.1.2.1(b) Fuel Inputs Shutoff When Class 1 Igniters Are Used

Condition Action Required

(1) First Class 1 igniter(s) fails to light after successfulunit purge. [See 6.6.5.2.1.3(B)(9) ,6.6.5.2.1.3(B)(10) , and 6.8.5.2.1.3(B)(7) .]

(1) Igniter valve(s) shall be closed immediately.Master fuel trip not required, but a 1-minute delayshall be required before retrial of that or any otherigniter.

(2) Any igniters proven on, all other fuel sources off, alligniter valves subsequently closed. (2) Master fuel trip shall be actuated.

(3) Any Class 1 igniter(s) proven on, any burner valveleaves closed limit, all burner valves subsequentlyclosed, no other main fuel in service, igniter(s) remainproven.

(3) Associated main fuel gas trip valve and/or fueloil trip valve shall be closed (fuel gas trip and/orfuel oil trip), proven igniters shall be permitted toremain in service.

(4) Any Class 1 igniter(s) proven on, any pulverizerstartup initiated, all pulverizers subsequently stopped,no other main fuel in service, igniter(s) remain proven.

(4) Proven igniters shall be permitted to remain inservice.

(5) All igniter and burner valves closed and all feedersor pulverizers stopped. (5) Master fuel trip shall be actuated.

Table 6.4.1.2.1(c) Fuel Inputs Shutoff When Class 2 or Class 3 Igniters Are Used


(1) First Class 2 or 3 igniter(s) fails to lightafter successful unit purge. [See6.6.5.2.1.3(B)(9) , 6.6.5.2.1.3(B)(10) , and6.8.5.2.1.3(B)(7) .]

(1) Igniter valve(s) shall be closed immediately. Master fueltrip not required, but a 1-minute delay shall be requiredbefore retrial of that or any other igniter.

(2) Any igniters proven on, all other fuelsources off, all igniter valves subsequentlyclosed.

(2) Master fuel trip shall be actuated.

(3a.1) Class 2 igniter(s) proven on, first mainburner trial for ignition fails. (3a.1) Master fuel trip shall be actuated.

(3a.2) Class 2 igniter(s) proven on, last mainburner is taken out of service in a normalshutdown.

(3a.2) Associated main fuel gas trip valve and/or fuel oiltrip valve shall be closed (fuel gas trip and/or fuel oil trip),proven igniters shall be permitted to remain in service.

(3a.3) Class 2 igniter(s) proven on, last mainburner is taken out of service in an abnormalshutdown.

(3a.3) Master fuel trip shall be actuated.

(3b.1) Class 3 igniters proven on, first mainburner trial for ignition fails. (3b.1) Master fuel trip shall be actuated.

(3b.2) Class 3 igniter(s) proven on, last mainburner is taken out of service in a normalshutdown.

(3b.2) Master fuel trip shall be actuated.

(3b.3) Class 3 igniter(s) proven on, last mainburner is taken out of service in an abnormalshutdown.


(4) Any Class 2 igniter(s) proven on, anypulverizer startup initiated, all pulverizerssubsequently stopped, no other main fuel inservice, igniter(s) remain proven.

(4) (a) If first pulverizer fails to ignite as described in6.8.5.2.1.3(B)(12) , master fuel trip shall be actuated.(b) If last pulverizer in service is tripped, master fuel tripshall be actuated. (c) If last pulverizer in service is takenout of service in a normal shutdown sequence by anoperator, proven igniters shall be permitted to remain inservice.


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(5) All igniter and burner valves closed andall feeders or pulverizers stopped. (5) Master fuel trip shall be actuated.


Referring to Block 10b, to accommodate for various types of once-through boiler designs and different operating conditions, recommend leaving the method of meeting the intent of Feedwater Flow Low trip to boiler manufacturer. Some existing methods of detecting Feedwater Flow issues are:1) Loss of all Boiler Feedwater Pumps;2) Waterwall Outlet Pressure High (possible blockage downstream);3) Waterwall Outlet Pressure Low (possible tube leaks downstream);4) Waterwall Outlet Temperature High (Feedwater Flow low relative to Fuel Flow);5) dP Low between Waterwall Outlet and Throttle Pressure headers.Alternative parameters such as P, T, dP, and equipment status can be used to detect Feedwater Flow Low as specified by boiler manufacturer.

Related Public Comments for This Document

Related Comment RelationshipPublic Comment No. 51-NFPA 85-2013 [Section No. A.6.4.1.2.1]


Submitter Full Name: SINMING KWONGOrganization: EMERSON PROCESS MANAGEMENT PWSStreet Address:City:State:Zip:Submittal Date: Mon Nov 11 16:13:34 EST 2013





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Figure 6.4.1.2.1 and Table 6.4.1.2.1(a) through Table 6.4.1.2.1(c) show the minimum required system ofinterlocks that shall be provided for basic furnace protection for a multiple burner boiler operated inaccordance with this code.Figure 6.4.1.2.1 Interlock System for Multiple Burner Boiler.

Table 6.4.1.2.1(a) Interlock System for Multiple Burner Boiler

BlockNumber Action

Block 1

Loss of an individual igniter flame shall cause the following actions:(1) Close the individual igniter safety shutoff valve(s) and de-energize the spark(s).(2) Open the vent valve (fuel gas ignition only).(3) Signal the main flame protection system that the igniter flame has been lost.

Block 2a1 High or low igniter fuel gas header pressure shall be interlocked to initiate the tripping ofthe igniter header and individual igniter safety shutoff valves and de-energize sparks.

Block 2a2 Low igniter fuel oil header pressure shall be interlocked to initiate the tripping of the igniterheader and individual igniter safety shutoff valves and de-energize sparks.

Block 2b

Where fuel oil is used for ignition fuel with air or steam atomization, atomizing air or steampressure out of range shall trip the igniter header and individual igniter safety shutoffvalves and de-energize sparks.�Where direct electric igniters are used, blocks 1 and 2 shall not apply. However, themaster fuel trip system shall de-energize sparks and prevent re-energizing until allconditions for light-off have been re-established.

Blocks 3through 13

These blocks represent conditions that initiate the tripping of all main and ignition fuelsupplies through a master fuel trip relay contact(s). The master fuel trip relay(s) shall be ofthe type that stays tripped until the unit purge system interlock permits it to be reset.Whenever the master fuel trip relay(s) is operated, it shall trip all fuel header, burner, andigniter safety shutoff valves and de-energize all sparks and all ignition devices within theunit and flue gas path through master fuel trip relay contact(s).�Master fuel trip relay contacts shall also trip the fuel oil system circulating andrecirculating valves. If the design of the fuel oil supply system is such that backflow of fueloil through the recirculating valve is inherently impossible or positively prevented, thisvalve shall be permitted to be manually operated and shall not be required to beinterlocked to close automatically on a master fuel trip.


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BlockNumber Action

Table 6.4.1.2.1(b) Fuel Inputs Shutoff When Class 1 Igniters Are Used


(1) First Class 1 igniter(s) fails to light after successfulunit purge. [See 6.6.5.2.1.3(B)(9) ,6.6.5.2.1.3(B)(10) , and 6.8.5.2.1.3(B)(7) .]

(1) Igniter valve(s) shall be closed immediately.Master fuel trip not required, but a 1-minute delayshall be required before retrial of that or any otherigniter.

(2) Any igniters proven on, all other fuel sources off, alligniter valves subsequently closed. (2) Master fuel trip shall be actuated.

(3) Any Class 1 igniter(s) proven on, any burner valveleaves closed limit, all burner valves subsequentlyclosed, no other main fuel in service, igniter(s) remainproven.

(3) Associated main fuel gas trip valve and/or fueloil trip valve shall be closed (fuel gas trip and/orfuel oil trip), proven igniters shall be permitted toremain in service.

(4) Any Class 1 igniter(s) proven on, any pulverizerstartup initiated, all pulverizers subsequently stopped,no other main fuel in service, igniter(s) remain proven.

(4) Proven igniters shall be permitted to remain inservice.

(5) All igniter and burner valves closed and all feedersor pulverizers stopped. (5) Master fuel trip shall be actuated.

Table 6.4.1.2.1(c) Fuel Inputs Shutoff When Class 2 or Class 3 Igniters Are Used


(1) First Class 2 or 3 igniter(s) fails to lightafter successful unit purge. [See6.6.5.2.1.3(B)(9) , 6.6.5.2.1.3(B)(10) , and6.8.5.2.1.3(B)(7) .]

(1) Igniter valve(s) shall be closed immediately. Master fueltrip not required, but a 1-minute delay shall be requiredbefore retrial of that or any other igniter.

(2) Any igniters proven on, all other fuelsources off, all igniter valves subsequentlyclosed.

(2) Master fuel trip shall be actuated.

(3a.1) Class 2 igniter(s) proven on, first mainburner trial for ignition fails. (3a.1) Master fuel trip shall be actuated.

(3a.2) Class 2 igniter(s) proven on, last mainburner is taken out of service in a normalshutdown.

(3a.2) Associated main fuel gas trip valve and/or fuel oiltrip valve shall be closed (fuel gas trip and/or fuel oil trip),proven igniters shall be permitted to remain in service.

(3a.3) Class 2 igniter(s) proven on, last mainburner is taken out of service in an abnormalshutdown.

(3a.3) Master fuel trip shall be actuated.

(3b.1) Class 3 igniters proven on, first mainburner trial for ignition fails. (3b.1) Master fuel trip shall be actuated.

(3b.2) Class 3 igniter(s) proven on, last mainburner is taken out of service in a normalshutdown.


(3b.3) Class 3 igniter(s) proven on, last mainburner is taken out of service in an abnormalshutdown.


(4) Any Class 2 igniter(s) proven on, anypulverizer startup initiated, all pulverizerssubsequently stopped, no other main fuel inservice, igniter(s) remain proven.

(4) (a) If first pulverizer fails to ignite as described in6.8.5.2.1.3(B)(12) , master fuel trip shall be actuated.(b) If last pulverizer in service is tripped, master fuel tripshall be actuated. (c) If last pulverizer in service is takenout of service in a normal shutdown sequence by anoperator, proven igniters shall be permitted to remain inservice.


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(5) All igniter and burner valves closed andall feeders or pulverizers stopped. (5) Master fuel trip shall be actuated.


It would not be sufficient to mention the "low drum water level" only as interlock condition for drum type boiler in consideration of the two types of Drum Boilers.One type is the natural circulation type and another is forced circulation type which is equipped with boiler circulation pumps (BCP).For the forced circulation type boiler, a low differential pressure of BCP is usually applied as interlock condition to initiate the master fuel trip relay instead of low drum water level condition.


Submitter Full Name: masahiko mishiroOrganization: Mitsubishi Heavy Industries,ltd.Street Address:City:State:Zip:Submittal Date: Thu Nov 14 00:07:12 EST 2013


I, masahiko mishiro, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am masahiko mishiro, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature


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Public Comment No. 46-NFPA 85-2013 [ Section No. 6.4.1.2.6.4(B) ]

(B) * A time delay before of not grester than 3 seconds before tripping of FD fan(s) shall be permitted where theduration is determined by a transient pressure analysis.


The furnace and downstream components on a balanced draft unit are not designed to withstand the pressure that the FD fans can provide.


Submitter Full Name: Allan ZadirakaOrganization: [ Not Specified ]Street Address:City:State:Zip:Submittal Date: Mon Nov 11 15:19:05 EST 2013


I, Allan Zadiraka, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am Allan Zadiraka, and I agree to be legally bound by the above Copyright Assignment and the termsand conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon mysubmission of this form, have the same legal force and effect as a handwritten signature


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Public Comment No. 75-NFPA 85-2013 [ Section No. 6.4.1.2.7.6 ]

6.4.1.2.7.6 * Before main fuel firing and following a 5-minute period after a following a master fuel trip (furnacepostpurge) , FD fans shall be tripped if the furnace pressure exceeds the maximum pressure valuerecommended by the manufacturer.


1. Comparing with 6.4.1.2.6.5 and 6.4.1.2.7.6, there is some possibility to invite misunderstanding, which is "post purge shall have more priority even in the condition that furnace pressure exceeds the maximum furnace design pressure".2. ID fan and FD fan shall be tripped before the main fuel firing and following a master fuel trip, when the furnace pressure exceeds the maximum furnace design pressure. 3. Since a natural post purge (15min.) is required as mentioned in 6.4.1.2.4.3 (C) in case of all fans trip condition, therefore there is no necessary to mention that post purge has more priority. 4. What We have to mention in this code is " When the FD fan stopped in the period of post purge incompleted condition, it is important to avoid to supply air suddenly, positively by starting FD fan".


Submitter Full Name: masahiko mishiroOrganization: Mitsubishi Heavy Industries, ltd.Street Address:City:State:Zip:Submittal Date: Fri Nov 15 00:28:32 EST 2013


I, masahiko mishiro, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am masahiko mishiro, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature


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6.4.1.2.8 Multiple and Variable-Speed Fan Interlocks.On start of the second fan and subsequent fan(s), whether the FD or ID type, the fan shall be capable ofdelivering airflow before airflow after opening its damper(s).


It is not possible to generate airflow through the fan with dampers closed. To generate airflow through the starting fan, its dampers need to be opened; and its fan speed develops sufficient head to overcome the discharge pressure of the parallel running fan.


Submitter Full Name: SINMING KWONGOrganization: EMERSON PROCESS MANAGEMENT PWSStreet Address:City:State:Zip:Submittal Date: Tue Nov 12 09:42:20 EST 2013





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6.4.2.1.27 Axial Flow Fan Nearing Stall Line.This condition shall be sensed and alarmed in accordance with the manufactuer manufacturer 'srecommendations.


The word was not spelled correctly.


Submitter Full Name: Dale EvelyOrganization: Southern Company Services, IncStreet Address:City:State:Zip:Submittal Date: Fri Sep 20 07:25:16 EDT 2013


I, Dale Evely, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in thisPublic Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that Iacquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similar orderivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am Dale Evely, and I agree to be legally bound by the above Copyright Assignment and the termsand conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon mysubmission of this form, have the same legal force and effect as a handwritten signature


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Public Comment No. 47-NFPA 85-2013 [ New Section after 6.5.2.1 ]

6.5.2.1.2High positive furnace pressure trip interlock shall be selected based on the positive design pressure of thefurnace.

6.5.2.1.3

High negative furnace pressure trip interlock shall be selected such that the trip value and the resultingnegative furnace pressure transient does not exceed the furnace negative transient design pressure.


The addition of the high negative furnace pressure trip requirement to the code requires that additional guidance be provided on setting the high negative pressure trip set point.







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Public Comment No. 48-NFPA 85-2013 [ Section No. 6.5.2.1 ]

6.5.2.1 Functional Requirements.6.5.2.1.1 The furnace pressure control system shall control the furnace pressure at the set point in thecombustion chamber.


Revise numbering to match proposed addition.







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Public Comment No. 53-NFPA 85-2013 [ Section No. 6.5.2.3 ]

6.5.2.3 Component Requirements.The furnace pressure control element(s) [(H) in Figure 6.5.2.2.1] (fan inlet damper blade pitch control,speed control) shall meet the following criteria:

(1)

(2) The operating speed The response of the furnace pressure control equipment shall not be less thanthat of the airflow control equipment.


To avoid confusion, it is best to change "speed" to "response". Otherwise, Reader can mis-interpret the statement such that ID Fan motor speed must be equal or greater than FD Fan motor speed.


Submitter Full Name: SINMING KWONGOrganization: EMERSON PROCESS MANAGEMENT PWSStreet Address:City:State:Zip:Submittal Date: Tue Nov 12 10:16:49 EST 2013




* The operating speed shall not exceed the control system's sensing and positioning capabilities.


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Public Comment No. 81-NFPA 85-2013 [ New Section after 6.5.3.2.2 ]

TITLE OF NEW CONTENT6.5.3.2.3 Where the system design does not permit the use of fully open air paths, the minimum open area air pathsshall be not less than that required for purge airflow requirements with fans in operation.


FR 162 asked for a new sectoni 6.5.3.2.2 which was inserted correctly. FR 162 stated that subsequent paragraphs should be renumbered. However, it appears that the old section 6.5.3.2.2 was deleted. Committee needs to confirm if the old section 6.5.3.2.2. is to be deleted or to be retained


Submitter Full Name: Daniel LeeOrganization: ABB IncorporatedStreet Address:City:State:Zip:Submittal Date: Fri Nov 15 09:45:42 EST 2013


I, Daniel Lee, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in thisPublic Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that Iacquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similar orderivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am Daniel Lee, and I agree to be legally bound by the above Copyright Assignment and the termsand conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon mysubmission of this form, have the same legal force and effect as a handwritten signature


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6.6.3.1.11 Valve Leak Testing.6.6.3.1.11.1 Tightness tests of the main safety shutoff valves, individual burner safety shutoff valves, and associatedvent valves shall be performed.6.6.3.1.11.2 Permanent provisions shall be made in the fuel gas piping to allow for making leak tests and subsequentrepairs.6.6.3.1.11.3 Valves added in vent lines for leak testing shall be either continuously monitored and alarmed when in theincorrect position or locked in the open position except when leak testing is being performed.


CC NOTE: The following CC Note No. 26 appeared in the First Draft Report.

The MBB committee should add a time frame to this requirement, such as "at least annually or in accordance with 4.4.1.1."


Submitter Full Name: CC on BCS-AACOrganization: CC on Boiler Combustion System HazardsStreet Address:City:State:Zip:Submittal Date: Wed Nov 13 13:12:05 EST 2013


I, CC on BCS-AAC, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am CC on BCS-AAC, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature


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6.6.3.1.11.1 Tightness tests of the main safety shutoff valves, individual burner safety shutoff valves, and associatedvent valves shall be performed at least annually or, for units firing a single fuel, at the first opportunity thatthe unit is down since the last tightness test .


"Shall be performed" it is not enforceable. The added text defines the minimum requirement.


Submitter Full Name: Celso SchmidtOrganization: UTC/Forney CorporationStreet Address:City:State:Zip:Submittal Date: Sun Nov 10 15:32:05 EST 2013


I, Celso Schmidt, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am Celso Schmidt, and I agree to be legally bound by the above Copyright Assignment and the termsand conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon mysubmission of this form, have the same legal force and effect as a handwritten signature


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6.6.5.1.3.2 * Successful completion of the leak test shall be done before the main gas supply header is be conducted,at least annually, before the safety shutoff header valve is placed into operation.

Additional Proposed Changes

File Name Description ApprovedA.6.6.5.1.3.2.docx Annex material for 6.6.5.1.3.2


1- Unless when an automatic gas header leak test is provided, the NFPA 85 community does not follow the requirement to perform a gas header leak test every time the Main Gas Header Shutoff Valve is closed. An annual gas leak test should be a minimum requirement.2- If automatic gas leak test is provided in the BMS logic, a Leak Test Credit of an 8-day period should be allowed to avoid the leak test to be repeated several times during a boiler start-up, wham multiple trips are expected. 3- Section 6.6.5.1.3 could be consolidated with section 6.6.3.1.11.4-Revised Anex material was suggested for this section.







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NFPA85 Chapter 6 ��

These�Notes�Recorded�and�Presented�by:�Celso�Schmidt��

November�18,�2013� � Page�1�of�2� � �

Proposed Annex material for Automatic Gas Header Leak Test

Automatic Gas Header Leak Test

The objective of the leak test is to ensure that the main gas header safety shutoff valve is not leaking gas and that the individual burner safety shutoff valves are not leaking gas into the furnace.

1. The Logic proves the following conditions before setting the Gas Header Leak Test permissive:

� All individual gas burner safety shutoff valves closed � Air flow at purge rate � Gas Supply pressure adequate � Gas Charging Valve closed (if existing) � Gas Header Safety Shutoff Valve closed � Gas Control Valve at Lightoff position

2. When the Main Gas Header Leak Test is commanded to start, the BMS logic opens momentary the Gas Charging Valve (or the Main Gas Safety Shutoff Valve if no charging valve is provided).

3. When the Main Gas Header reaches an adequate pressure for the Leak Test to be performed (usually a little above the maximum operating pressure) the Gas Charging Valve (or the Main Gas Safety Shutoff Valve) is commanded to close.

4. If the leak test adequate pressure is not established in a 15 seconds time interval, the test is interrupted and an alarm “Main Gas Header Leak Test Pressurization Failure” is issued.

5. When the main gas header reaches the adequate pressure for leak test (provided by a pressure transmitter installed at the gas header), this value is “captured” by the BMS logic.

6. During the next 180 seconds, this “captured” value is compared with the actual main gas header pressure:

a) If the main gas header pressure drops 10% below the “captured” gas header leak test value, the header is leaking and an alarm “Main Gas Header Safety Shutoff Valve Leak Test Failure” is issued.

b) If the main gas header pressure increases 10% above the “captured” gas header leak test value, the Main Gas Header Safety Shutoff Valve is leaking and an alarm “Main Gas Header Safety Shutoff Valve Leak Failure” is issued.

c) If the main gas header pressure remains in limits of the “captured” gas header leak test value, the gas leak test is successful and an indication “Main Gas Leak Test Successful” is displayed.

7. To test the second burner gas block valves and the burner vent valves, the BMS logic shall be repeated with the first burner gas block valve maintained open and the burner vent valves maintained closed.

8. When the Main Gas Header Leak Test is Successful in both stages, this status remains set for 8 hours. The operator command to re-start the leak test resets the 8-hours leak test credit.



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Typical HMI graphic display (for oil fuel)

The starting sequence shall be performed in the following order:

(1) An open flow path from the inlets of the FD fans through the stack shall be verified.

(2) An ID fan, if provided, shall be started; an FD fan then shall be started. Additional ID fans or FD fansshall be started in accordance with 6.5.3, as necessary, to achieve purge flow rate.

(3) Dampers and burner registers shall be opened to the purge position in accordance with the openregister purge method objectives outlined in 6.6.5.1.5.7.

(4) The airflow shall be adjusted to purge airflow rate, and a unit purge shall be performed. Specialprovisions shall be utilized as necessary to prevent the hazardous accumulation of volatile vapors thatare heavier than air or to detect and purge accumulations in the furnace bottom.

(5) The main fuel control valve shall be closed and be positioned at lightoff firing rate (or closed if abypass regulator is being provided) and the main safety shutoff valve(s) shall be opened, but onlyafter the requirements of 6.6.5.1.3 for leak test requirements and 6.4.1.2.4 for permissive conditionsin the unit purge system have been satisfied.

(6) It shall be determined that the main fuel control valve is closed, and the following procedures shall beperformed:

(a) The main fuel bypass control valve, if provided, shall be set to maintain the necessary burnerheader fuel pressure for light-off.

(b) The burner headers shall be vented in order to be filled with fuel gas and to provide a flow (ifnecessary) so that the main fuel and bypass fuel control valves function to regulate and maintainthe correct pressure for burner light-off.

(c) The main fuel control valve shall be opened when necessary.

(d) The time needed to vent for control of header pressure after header charging shall be evaluatedand minimized.

(7) The igniter safety shutoff valve shall be opened, and the following shall be performed:

(a) It shall be confirmed that the igniter fuel control valve is holding the manufacturer'srecommended fuel pressure necessary for the igniter to operate at design capacity.

(b) The igniter headers shall be vented in order to be filled with fuel gas and to provide a flow (ifnecessary) so that the igniter fuel control valve functions to regulate and maintain the pressurewithin design limits specified by the manufacturer for lighting the igniters.

(c) The time needed to vent for control of header pressure after header charging shall be evaluatedand minimized.

(8) The air register or damper on the burner selected for light-off shall be adjusted to the positionrecommended by the manufacturer or the established operating procedure, in accordance with6.6.5.1.5.7(C) through 6.6.5.1.5.7(F).

(9) The spark or other source of ignition for the igniter(s) on the burner(s) to be lit shall be initiated, andthe procedure shall continue as follows:

(a) The individual igniter safety shutoff valve(s) shall be opened, and all igniter system atmosphericvent valves shall be closed.

(b) If flame on the first igniter(s) is not established within 10 seconds, the individual igniter safetyshutoff valve(s) shall be closed and the cause of failure to ignite shall be determined andcorrected.

(c) With airflow maintained at purge rate, repurge shall not be required, but at least 1 minute shallelapse before a retrial of this or any other igniter is attempted.

(d) Repeated retrials of igniters without investigating and correcting the cause of the malfunctionshall be prohibited.

(10) Where Class 3 special electric igniters are used, the procedures described in 6.6.5.2.1.3(B) (1)through 6.6.5.2.1.3(B) (6), 6.6.5.2.1.3(B) (8), and 6.6.5.2.1.3(B) (11) through 6.6.5.2.1.3(B) (14) shallbe used, consistent with the the requirements for individual main burner flame supervision.

(11) After making certain that the igniter(s) is established and is providing the required level of ignitionenergy for the main burner(s), the following shall be performed:


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(a) The individual burner safety shutoff valve(s) shall be opened and the individual burneratmospheric vent valves shall be closed.

(b) Except where associated Class 1 igniters are in service, a master fuel trip shall be initiated whenthe flame detection system(s) indicates that ignition has not been obtained within 5 seconds ofthe time the main fuel actually begins to enter the furnace.

(c) Purging shall be repeated, and the conditions that caused the failure to ignite shall be correctedbefore another light-off attempt is made.

(d) For the following burner and all subsequent burners placed in operation, failure to ignite or loss ofignition for any reason on any burner(s) shall cause fuel flow to that burner(s) to stop.

(e) All conditions required by the manufacturer or by established operating procedures for light-offshall exist before restarting the burner(s).

(12) After stable flame is established, the air register(s) or damper(s) shall be adjusted slowly to itsoperating position, making certain that ignition is not lost in the process. With automatic burnermanagement systems, the air register shall be permitted to be opened simultaneously with the burnersafety shutoff valve.

(13) Class 3 igniters shall be shut off at the end of the time trial for proving the main flame, and thefollowing shall be verified:

(a) The stable flame continues on the main burners after the igniters are shut off.

(b) The systems that allow the igniters to remain in service on either an intermittent or a continuousbasis have been tested to meet all the requirements of Class 1 igniters or Class 2 igniters withassociated interlocks in service.

(14) After stable burner header pressure control has been established, the burner header atmospheric ventvalve shall be closed.

(15)

(16)

(17)

(18)

(19)

(20)

(21)

(22)

(23) The maximum number of burners shall be placed in service consistent with the anticipated continuousload and the operating range of fuel header pressures.

(24) The on-line metering combustion control (unless designed specifically for start-up procedures) shallnot be placed into service until the following have occurred:

(a) A predetermined minimum main fuel input has been attained.

(b) All registers on nonoperating burners are closed unless compensation is provided for by thecontrol system.

(c) The burner fuel and airflow are adjusted as necessary.

* The sequence shall continue as follows:

The procedures in 6.6.5.2.1.3(B) (8) through 6.6.5.2.1.3(B) (13) shall be followed for placingadditional burners with open registers in service, as necessary, to raise steam pressure or tocarry additional load.

If used, automatic control of burner fuel flow and burner airflow during the lighting and start-upsequence shall be in accordance with the requirements of 6.6.5.2.1.3(B) (17).

The fuel flow to each burner (as measured by the burner fuel header pressure) shall bemaintained at a controlled value that is compatible with the established airflow through thecorresponding burner.

The established airflow through each open register shall be permitted to be maintained bycontrolling the windbox-to-furnace differential.

Total furnace airflow shall not be reduced below purge rate airflow and shall be at least thatwhich is necessary for complete combustion in the furnace.

If it is necessary to vary fuel header pressure to eliminate a problem of having excessivelighting off and shutting down of burners, such variations shall be limited to a predeterminedrange.

This range shall be a function of the incremental fuel input that is added by the lighting of asingle burner or gang of burners.


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(d) Stable flame and specified furnace conditions have been established.

(25) It shall be permitted to place a multiple number of igniters in service that are served simultaneouslyfrom a single igniter safety shutoff valve, provided that the igniters are reliably supervised, so thatfailure of one of the group to light causes the fuel to all igniters in the group to shut off.

(26) It also shall be permitted to place in service simultaneously a multiple number of burners served bytheir corresponding multiple igniters from a single burner safety shutoff valve, provided that theburners are reliably supervised, so that failure of one of the group to light causes the fuel to all burnersin the group to shut off.

(27) On units with an overfire air system, the overfire air control damper positions shall be permitted to bechanged only when repositioning of all burner air registers or burner air dampers is permitted.

(28) On units with an overfire air system, the boiler shall be operating in a stable manner before theoverfire air is introduced. The introduction of the overfire air shall not adversely affect boiler operation.

(29) On units with an overfire air system and a reburn system, the overfire air shall be placed in operationbefore the reburn fuel sequence is started.

(30) A reburn system shall be placed in service only after the following have occurred:

(a) The boiler shall be operating at a load that ensures the introduction of the reburn fuel will notadversely affect continued boiler operation.

(b) The temperature in the reburn zone shall be maintained in accordance with 6.6.3.5.2.

(c) The boiler shall be operating in a stable manner before the reburn start-up sequence is initiated.


If a bypass regulator for burner lightoff is not provided, as usual, the valve needs to be proven at lightoff firing rate (minimum position).







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6.6.5.2.3.10 * After shutting down the forced and induced draft fans, dampers in the flue gas path shall and air path shallbe permitted to be closed.


The original text stated that closing the burner air registers was allowed but the FR text only allows the closing of the boiler flue gas path. I understand that the first report was modified for two purposes 1) to address multiple boilers with a common flue gas path and to allow boiler bottle-up. The closing of the flue gas path is a requirement for multiple boilers but, closing the flue gas path is not necessary the only means to bottle up the boilers. I understand that some user bottle up the boiler with both the air gas path and flue gas path. The proposed comment is consistent with the original requirement and the current industry practice of bottling up the boiler.







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6.7.3.1.2.2 * Relief valve discharge passages, vents, and telltales shall be provided with suitable piping to allowdischarge of fuel oil, vapors, or toxic fumes in accordance with the requirements of 4.9.1. away fromsources of ignition, combustion air intakes, building ventilation systems, or windows of a boiler or HSRGroom or adjacent buildings and shall be designed for the expected range of external temperatures andprotected against mechanical damage.


The First Draft text references section 4.9.1 which is for Gaseous Vents.

The proposed text is similar to the First Draft wording added to for HRSG liquid fuels (8.4.3.2.3.5).


Submitter Full Name: Steven GrafOrganization: Emerson Process ManagementStreet Address:City:State:Zip:Submittal Date: Fri Oct 25 08:30:49 EDT 2013


I, Steven Graf, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in thisPublic Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that Iacquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similar orderivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am Steven Graf, and I agree to be legally bound by the above Copyright Assignment and the termsand conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon mysubmission of this form, have the same legal force and effect as a handwritten signature


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6.7.3.1.11.1 Tightness tests of the main safety shutoff valves and individual burner safety shutoff valves shall beperformed at least annually or, for units firing a single fuel, at the first opportunity that the unit is down afterone year since the last tightness test .


'Shall be provided" it is not enforceable. The added text defines the minimum requirement.







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6.7.5.1.2.1 Cleaning devicesshall devices shall be operated only where heat input to the furnace is at a rate highenough to prevent a flameout during the sootblower operation cleaning device operation .


In the revised First Revision text, the term "sootblower" has been revised to a generic term of "cleaning devices". The change was made to the first reference to "sootblower" at the beginning of the section but also applies to the second reference to “sootblower” at the end of the section. This also provides consistency with the FR text in section 6.6.5.1.2.1.


Submitter Full Name: John O'RourkeOrganization: ALSTOM Power Inc.Street Address:City:State:Zip:Submittal Date: Wed Nov 13 11:33:29 EST 2013


I, John O'Rourke, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am John O'Rourke, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature


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6.7.5.1.2.3 The use of waterwall cleaning devices and high temperature superheater and reheater sootblowers shallreheater cleaning devices shall be permitted for cleaning during periods of unit outage if a unit purge hasbeen completed and purge rate airflow is maintained.


In the revised First Revision text, the term "sootblower" has been revised to a generic term of "cleaning devices". The change was made to the first reference to "sootblower" at the beginning of the section but also applies to the second reference to “sootblower” at the end of the section. The term “superheater and reheater sootblowers" should be replaced with "superheater and reheater cleaning devices". The original text referenced “wall sootblowers” and “superheater and reheater sootblowers”. In the First Revision text, the term "wall sootblowers" was deleted and was replaced with "Cleaning Devices". The term “wall” should be added to the FR text. Assuming that the above comment is accepted, The revised would otherwise read, “6.7.5.1.2.3 The use of cleaning devices and high temperature superheater and reheater cleaning devices shall be permitted…The above comments provide consistency with the FR text in section 6.6.5.1.2.3.


Submitter Full Name: John O'RourkeOrganization: ALSTOM Power Inc.Street Address:City:State:Zip:Submittal Date: Wed Nov 13 13:09:34 EST 2013


I, John O'Rourke, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am John O'Rourke, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature


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6.7.5.1.3 * Operational Leak Test.An operational leak test shall be performed in accordance with established procedures while maintaining ,at a minimum least annually , while maintaining purge rate airflow before , before the oil supply safetyshutoff header is valve is placed in service operation .

Additional Proposed Changes

File Name Description ApprovedA.6.7.5.1.3.docx Annex material for 6.7.5.1.3


1- Unless when an automatic oil header leak test is provided, the NFPA 85 community does not follow the requirement to perform an oil header leak test every time the Main Oil Header Shutoff Valve is closed. An annual oil leak test should be a minimum requirement.2- If automatic oil leak test is provided in the BMS logic, an Oil Leak Test Credit of an 8-day period should be allowed to avoid the leak test to be repeated several times during a boiler start-up, when multiple trips are expected. 3- Section 6.7.5.1.3 could be consolidated with section 6.7.3.1.11.4-Revised Anex material was suggested for this section.







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November�18,�2013� � Page�1�of�2� � �

Proposed Annex material for Automatic Oil Header Leak Test

Automatic Main Oil Header Leak Test

The objective of the leak test is to ensure that the main oil header safety shutoff valve is not leaking oil and that the individual burner safety shutoff valves are not leaking oil into the furnace.

1. The Logic proves the following conditions before setting the Oil Header Leak Test permissive:

� All individual oil burner safety shutoff valves closed � Air flow at purge rate � Oil Supply pressure adequate � Oil Temperature adequate � Oil Recirculation Valve closed � Oil Header Safety Shutoff Valve closed � Oil Control Valve at Lightoff position

2. When the Main Oil Header Leak Test is commanded to start, the BMS logic opens momentary the Main Oil Safety Shutoff Valve.

3. When the Main Oil Header reaches an adequate pressure for the Leak Test to be performed (usually a little above the maximum operating pressure) the Main Oil Safety Shutoff Valve is commanded to close.

4. If the leak test adequate pressure is not established in a 5 seconds time interval, the test is interrupted and an alarm “Main Oil Header Leak Test Pressurization Failure” is issued.

5. When the main oil header reaches the adequate pressure for leak test (provided by a pressure transmitter installed at the oil header), this value is “captured” by the BMS logic.

6. During the next 60 seconds, this “captured” value is compared with the actual main oil header pressure:

a) If the main oil header pressure drops 20% below the “captured” oil header leak test value, the header is leaking and an alarm “Main Oil Header Safety Shutoff Leak Test Failure” is issued.

b) If the main oil header pressure increases 10% above the “captured” oil header leak test value, the Main Oil Header Safety Shutoff Valve is leaking and an alarm “Main Oil Header Safety Shutoff Valve Leak Failure” is issued.

c) If the main oil header pressure remains in limits of the “captured” oil header leak test value, the oil leak test is successful and an indication “Main Oil Leak Test Successful” is displayed.

7. When the Main Oil Header Leak Test is Successful, this status remains set for 8 hours. The operator command to re-start the leak test resets the 8-hours leak test credit.



November�18,�2013� � Page�2�of�2� � �

Typical HMI graphic display


6.7.5.2.3.11 * After shutting down the forced and induced draft fans, dampers in the flue gas path and air path shall bepermitted to be closed.









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6.8.5.2.3.7 * After shutting down the forced and induced draft fans, dampers in the flue gas path and air gas path shallbe permitted to be closed.









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Public Comment No. 51-NFPA 85-2013 [ Section No. A.6.4.1.2.1 ]

A.6.4.1.2.1 In block 6 of Table 6.4.1.2.1(a), high furnace pressure could be caused by tube rupture, damper failure, orexplosion.

In block 8 of Table 6.4.1.2.1(a), the partial loss of flame described is potentially more hazardous at lowerload levels. The decision regarding specific requirements or implementation of this trip should be a designdecision based on furnace configuration, total number of burners, number of burners affected as apercentage of burners in service, arrangement of burners affected, interlock system, and load level. Thistrip is interlocked through flame supervisory equipment.

In block 9 of Table 6.4.1.2.1(a), the tables referenced describe the allowable differences in operatingprocedures based on the classification of igniter being used. The following descriptions of conditions aretypical for both Table 6.4.1.2.1(b) and Table 6.4.1.2.1(c).

(1) Condition 1: An event in which, after a successful boiler purge, an attempt(s) to place the first igniterin service fails

(2) Condition 2: An event in which an igniter(s) has been proven in service and subsequently all ignitersare shut down without the attempt ever having been made to place a burner or pulverizer in service

(3) Condition 3: An event in which gas and/or oil fuel burners were started or attempted to be started andall burner valves were subsequently closed while igniters remain proven in service

(4) Condition 4: An event in which a pulverizer system(s) was started up or attempted to be started upand subsequently all pulverizer systems were shut down while igniters remain proven in service

(5) Condition 5: An event in which any fuel has been placed in service and all fuel subsequently shut off

In the event that any main fuel is shut down while any other main fuel remains proven in service, theall-fuel-off master fuel trip requirements do not apply.

In block 10a of Table 6.4.1.2.1(a), low drum water level has been included as a master fuel trip. Althoughlow drum water level is not a combustion-related hazard, this code is the primary resource for identifyingBMS requirements, and not including a low drum level trip in Figure 6.4.1.2.1 has created confusion withusers of this code. A master fuel trip based on low drum water level for drum-type boilers is commonlyrecognized good engineering practice.

In block 10b of Table 6.4.1.2.1(a), low feedwater flow is also not a combustion –related combustion–related hazard. The low feedwater flow threshold could be a fixed value or a function of the boiler loaddemand based on the boiler manufacturer’s recommendations. A time delay as specified by boilermanufacturer is allowed to accommodate transient operating conditions.


In once-through units, both feedwater flow and steam flow (load) move together. Therefore, it is better to use load demand rather than load to determine the feedwater flow low setpoint. A time delay for the feedwater flow low trip may be required as determined by boiler manufacturer to accommodate transient operating conditions. For example, on loss of a boiler feedwater pump (BFP), feedwater flow can be lower than setpoint temporarily while unit load control is running back the load demand to a target that can be sustained by one BFP.


Submitter Full Name: SINMING KWONGOrganization: EMERSON PROCESS MANAGEMENT PWSStreet Address:City:State:


104 of 109 11/18/2013 11:57 AM

Zip:Submittal Date: Tue Nov 12 09:16:58 EST 2013





105 of 109 11/18/2013 11:57 AM

Public Comment No. 66-NFPA 85-2013 [ Section No. A.6.6.5.1.3 ]

A.6.6.5.1.3 The objective of the leak test is to ensure that the individual burner safety shutoff valves are not leakinggas into the furnace. The test can be performed by proving the individual burner safety shutoff valves areclosed, then closing the main fuel header vent valve, opening the main safety shutoff valve, thuspressurizing the header, then closing the main safety shutoff valve. If a charging valve is used, the test isperformed by proving the main safety shutoff valve is closed and proving the individual burner safetyshutoff valves are closed, then closing the main fuel header valve, then opening the charging valve topressurize the header, then closing the charging valve. That pressure must be held within predeterminedlimits for a predetermined amount of time for the test to be successful.


CC NOTE: The following CC Note No. 29 appeared in the First Draft Report.

The MBB committee should review A.6.6.5.1.3, A.6.7.5.1.3, and A.7.7.5.2.1.2(A) and consider modifications to make the language consistent between these sections.


Submitter Full Name: CC on BCS-AACOrganization: CC on Boiler Combustion System HazardsStreet Address:City:State:Zip:Submittal Date: Wed Nov 13 13:30:02 EST 2013


I, CC on BCS-AAC, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright inthis Public Comment (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend thatI acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Comment in this or another similaror derivative form is used. I hereby warrant that I am the author of this Public Comment and that I have full power and authority to enter intothis copyright assignment.

By checking this box I affirm that I am CC on BCS-AAC, and I agree to be legally bound by the above Copyright Assignment and theterms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will,upon my submission of this form, have the same legal force and effect as a handwritten signature


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Attachment C: BCS-FUN Second Revisions

Second Revision No. 16-NFPA 85-2013 [ Global Comment ]

Revise all liquid fuel supply system diagrams with equipment isolation valves to be consistent withthe revised fuel gas supply system diagrams. See attached diagrams.


Submitter Full Name: [ Not Specified ]

Organization: [ Not Specified ]

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Submittal Date: Thu Dec 05 13:22:34 EST 2013

Committee Statement

CommitteeStatement:

The liquid fuel system diagrams were revised to reflect the equipment isolation valve to beconsistent with changes made to fuel gas supply system diagrams throughout the code.

ResponseMessage:

National Fire Protection Association Report http://localhost:8084/TerraViewWeb/ContentFetcher?commentParams=(...

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Second Revision No. 1-NFPA 85-2013 [ Section No. 3.3.2.4 ]

3.3.2.4 * Excess Air.Air supplied for combus on in excess of

the stoichiometric mixture of air and fueltheore cal air .




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Submittal Date: Wed Dec 04 11:15:01 EST 2013

Committee Statement

CommitteeStatement:

The committee reinstated the previous definition of excess air and moved the previous definition oftheoretical air to the annex (SR-2). The dictionary definition does not adequately describe the term"stoichiometry" as used in the context of the First Revision.

ResponseMessage:

Public Comment No. 40-NFPA 85-2013 [Section No. 3.3.2.4]


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Second Revision No. 3-NFPA 85-2013 [ New Section after 3.3.25.2 ]

3.3.26.3 Manual Supervised Burner Management System. Aburner management system by which a furnace is purgedand a burner is started, ignited, and stopped manually. Interlocksare included to ensure that the operation followsestablished, proper procedures.




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Committee Statement

CommitteeStatement:

The definition is reinstated because the term is now used in the single burner boilerchapter.

Response Message:

Public Comment No. 85-NFPA 85-2013 [Section No. 3.3.26]


3 of 17 12/5/2013 1:24 PM

Second Revision No. 4-NFPA 85-2013 [ Section No. 3.3.43 ]

3.3.43 Direct-Fired System.

A system in which the fuel is pulverized and delivered in suspension directly to the burner(s).




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Committee Statement

Committee Statement: "3.3.43 Direct- Fired" should use either a "-" or a space, not both.

Response Message:



4 of 17 12/5/2013 1:24 PM


3.3.52.4 Induced Draft (ID) Fan.

A fan downstream of the combustion process used to remove the products of combustion from the boiler,HRSG, or flue gas ductwork.




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Committee Statement

Committee Statement: The text was missing a space between ",HRSG".

Response Message:



5 of 17 12/5/2013 1:24 PM

Second Revision No. 6-NFPA 85-2013 [ Sections 3.3.76.1, 3.3.76.2, 3.3.76.3, 3.3.76.4,

3.3.76.5, ... ]

Sections3.3.76.1, 3.3.76.2, 3.3.76.3, 3.3.76.4, 3.3.76.5, 3.3.76.6, 3.3.76.7, 3.3.76.8, 3.3.76.9, 3.3.76.10, 3.3.76.11, 3.3.76.12

3.3.76.1 Normal Shutdown, High Steam Pressure Interlock.

A pressure-actuated device that is arranged to effect a normal burner shutdown when the steam pressureexceeds a preset pressure.

3.3.76.2 Normal Shutdown, High Water Temperature Interlock.

A temperature-actuated device that is arranged to effect a normal burner shutdown when the watertemperature exceeds a preset temperature.

3.3.76.3 Process Monitoring, High Oil Temperature Interlock.

A temperature-actuated device that initiates a signal when oil temperature rises above the limits that arerequired to maintain the viscosity range recommended by the burner manufacturer.

3.3.76.4 Process Monitoring, Low Oil Temperature Interlock.

A temperature-actuated device that initiates a signal when the oil temperature falls below the limits that arerequired to maintain the viscosity range recommended by the burner manufacturer.

3.3.76.5 Proof of Closure Interlock.

A device that provides feedback that a piece of equipment is in the closed position.

3.3.76.6 Safety Shutdown, Excessive Steam Pressure Interlock.

A pressure-actuated device that is arranged to effect a safety shutdown of the burner when the steampressure exceeds a preset pressure.

3.3.76.7 Safety Shutdown, Excessive Water Temperature Interlock.

A temperature-actuated device that is arranged to effect a safety shutdown of the burner when the watertemperature exceeds a preset temperature.

3.3.76.8 Safety Shutdown, High Gas Pressure Interlock.

A pressure-actuated device that is arranged to effect a safety shutdown or to prevent starting when the gaspressure exceeds the preset value.

3.3.76.9 Safety Shutdown, Low Gas Pressure Interlock.

A pressure-actuated device that is arranged to effect a safety shutdown or to prevent starting when the gaspressure falls below the preset value.

3.3.76.10 Safety Shutdown, Low Oil Pressure Interlock.

A pressure-actuated device that is arranged to effect a safety shutdown or to prevent starting when the oilpressure falls below the preset value.

3.3.76.11 Safety Shutdown, Low Water Cutout Auxiliary Interlock.

On single burner boilers, a device that is arranged to effect a safety shutdown of the burner when the waterlevel in the boiler falls to a predetermined low level.

3.3.76.12 Safety Shutdown, Low Water Cutout Interlock.

A device that is arranged to effect a safety shutdown or master fuel trip when the water level in the boiler orHRSG falls to a predetermined low level.




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Committee Statement


6 of 17 12/5/2013 1:24 PM

CommitteeStatement:

New items 3.3.76.1 through 3.3.76.12 are a list of interlocks required by SBB in Chapter 5, notdefinitions. The same applies to original items 3.3.156.1 through 3.3.156.12.

ResponseMessage:

Public Comment No. 43-NFPA 85-2013 [Sections 3.3.76.1, 3.3.76.2, 3.3.76.3, 3.3.76.4, 3.3.76.5, ...]



7 of 17 12/5/2013 1:24 PM

Second Revision No. 13-NFPA 85-2013 [ New Section after 3.3.102 ]

3.3.103 Purge Into Service.

To displace air in a fuel gas piping system with inert gas, and then displace the inert gas with fuel gas.

3.3.104 Purge Out of Service.

To displace the fuel gas in a fuel gas piping system by inert gas, and then displace the inert gas with air.




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Committee Statement

CommitteeStatement:

New definitions are added to support requirements added to chapter 4 in SR 14 and SR15.

Response Message:


8 of 17 12/5/2013 1:24 PM


3.3.124 * Test Block Capability.

The point on the fan head versus flow characteristic curve at which the fan is selected. This is the calculatedoperating point associated with the maximum continuous rating of the boiler or HRSG, plus the head andflow margins

A.3.3.124 Test Block Capability. The test block capability of the fan is a theoretical duty that includes somemargin beyond the actual volume and pressure requirements .




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Committee Statement

CommitteeStatement:

The committee deleted the second sentence of the definition because it addressed only theboilers and HRSGs. The committee created new annex material to clarify the intent of the term inthe context of NFPA 85.

ResponseMessage:



9 of 17 12/5/2013 1:24 PM

Second Revision No. 14-NFPA 85-2013 [ New Section after 4.2.7 ]

4.2.8*

When fuel gas is introduced into piping downstream of the equipment isolation valve, the contents shall bedisplaced in accordance with one of the following:

(1) Discharged through a permanently-installed venting system; or

(2) Discharged into the boiler or HRSG in accordance with the normal start-up sequence; or

(3) Purged into service in accordance with chapter 7 of NFPA 56.

Supplemental Information

File Name Description

A_4_2_8.docx




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Committee Statement

CommitteeStatement:

New requirements were added to address charging fuel gas piping that is within the scope of NFPA85, i.e. piping downstream of the equipment isolation valve. Unlike other equipment gas trains, NFPA85 requires many vent valves that can be utilized for the purpose of safely charging the piping systemwith fuel gas. In addition, the pipe volume ratio of such piping relative to pipe normally open toatmosphere is small, therefore discharging through the permanently-installed venting system or as partof the normal start-up sequence generally provides an adequate level of safety. Where this pipingsection presents a significant volume, users may consider using NFPA 56 procedures in lieu of theventing system or start-up procedure.

ResponseMessage:


10 of 17 12/5/2013 1:24 PM

Second Revision No. 15-NFPA 85-2013 [ New Section after 4.4.1.7 ]

4.4.2 Purging Fuel Gas Piping Into and Out of Service.

4.4.2.1 Prior to the opening of fuel gas piping systems for maintenance, the piping section shall be isolatedfrom the fuel gas supply and the fuel gas piping system downstream of the equipment isolation valve shall bepurged out of service in accordance with chapter 8 of NFPA 56.

4.4.2.2 Following maintenance, fuel gas shall be introduced into piping downstream of the equipmentisolation valve in accordance with 4.2.8.




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Committee Statement

CommitteeStatement:

New requirements were added for removing piping systems from service when maintenance isneeded. NFPA 56 is referenced because it provides guidance for industrial piping systems, andspecifically power plants as well as the hazards of nitrogen and other inert gases during purgeprocedures. New requirements were added to address charging fuel gas piping that is within the scopeof NFPA 85, i.e. piping downstream of the equipment isolation valve. Unlike other equipment gas trains,NFPA 85 requires many vent valves that can be utilized for the purpose of safely charging the pipingsystem with fuel gas. In addition, the pipe volume ratio of such piping relative to pipe normally open toatmosphere is small, therefore discharging through the permanently-installed venting system or as partof the normal start-up sequence generally provides an adequate level of safety. Where this pipingsection presents a significant volume, users may consider using NFPA 56 procedures in lieu of theventing system or start-up procedure.

ResponseMessage:


11 of 17 12/5/2013 1:24 PM


4.5.4 *

The design shall not require any deliberate defeating of an interlock to start or operate equipment.

Supplemental Information

File Name Description

Annex_4_5_4.docx New Annex text for 4.5.4.




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Committee Statement

CommitteeStatement:

The committee recognizes that conditioning of interlocks is typically required for normal start-upand operation. The committee created annex text to advise users that such conditioning is notprohibited by the new 4.5.4 requirement.

ResponseMessage:



12 of 17 12/5/2013 1:24 PM


4.8.1

Where multiple boilers or HRSGs are supplied from the same fuel supply source, there an equipmentisolation valve shall be a means of manual isolation provided for each boiler and HRSG.




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Committee Statement

CommitteeStatement:

The intent is to isolate the fuel supply to individual boilers or HRSGs, which is not clear in originaltext. The requirement is updated to reflect the newly-defined term equipment isolation valve.

ResponseMessage:



13 of 17 12/5/2013 1:24 PM


4.10.3.1 *

The requirements in Section 4.10.3 shall apply to flue gas path auxiliary systems that inject fuel, oxidizer, orcombustible reagent into the boiler enclosure or flue gas path when in operation.

A.4.10.3.1

Flue gas path auxiliary systems shall be that inject fuel, oxidizer, or combustible reagent into a boilerenclosure or flue gas path can include but are not limited to sulfur burner systems, ammonia injectionsystems, activated carbon injection systems, soot blowing or soot cleaning systems, and fired reheatersystems.




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Committee Statement

CommitteeStatement:

The mandatory text is revised to be a more general description of flue gas path auxiliary systemsand the list of examples is moved to the annex. There could be other systems that should meet therequirements of this section that are not in the "list", that could be construed as the requirements notapplying to them. The proposed revised wording and Annex material addresses these concerns.

ResponseMessage:



14 of 17 12/5/2013 1:24 PM


4.11.1.1

The basic requirement of an interlock system for a unit boiler or combustion system shall accomplish thefollowing:

(1) Protect personnel from injury

(2) Protect equipment from damage

(3) Protect boiler operation by limiting actions to a prescribed operating sequence or by initiating tripdevices when approaching an out-of-range or unstable operating condition




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Committee Statement

CommitteeStatement:

The term "unit" has a definition that would inappropriately limit the application of this requirement.The term "boiler or HRSG" would not include pulverized fuel systems. The term "boiler or combustionsystem" should define the intended scope more appropriately. The term "boiler" was removed fromthe last line for the same reason.

ResponseMessage:



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Second Revision No. 12-NFPA 85-2013 [ Section No. 4.12.3.5.7 ]

4.12.3.5.7

The response time from flame failure to the de-energization initiation of the trip signal to the fuel safetyshutoff devices shall not exceed 4 seconds, including any time delay associated with the flame detector.




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Committee Statement

CommitteeStatement:

The text was revised to reflect that not all fuel shutoff devices are de-energized to close. Forexample Coal Line Shutoff Valves can be "energize to open" and "energize to close." On newinstallations, some Boiler OEMs are providing dual coil solenoid and motor operated valves for Gasand Oil igniters.

ResponseMessage:

Public Comment No. 18-NFPA 85-2013 [Section No. 4.12.3.5.7]


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Second Revision No. 2-NFPA 85-2013 [ Section No. A.3.3.2.4 ]

A.3.3.2.4 Excess Air.

This is not the same as air-rich, as defined in 3.3.5. The theoretical air is the chemically correct quantity

of air needed for complete combustion of a given quantity of a specific fuel.




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Committee Statement

CommitteeStatement:

The committee relocated the existing definition to the annex material because the only locationthe term is used is in the definition for excess air.

ResponseMessage:


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