nh3 refrig ragagep
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For Official Use Only
Ammonia RefrigerationAmmonia Refrigeration
RAGAGEPsRAGAGEPs
For Official Use Only
Objectives
Gain a basic understanding of: Gain a basic understanding of: RAGAGEPs unique to Ammonia
RefrigerationRefrigeration Equipment-specific RAGAGEP
requirementsrequirements
Again, this is an overview discussion. There is usually an exception to most rules
Slide 2
RAGAGEP Organizations
ASME ASME ANSI /ASHRAE IIAR
NB NB NIOSH RMA
Slide 3
ASME / NB
BPVCDesign, fabrication, inspection, testing and certification of vessels operating above 15 psig (internal and/or external)psig (internal and/or external)
B31.5Refrigeration Piping and Heat Transfer Components
NBIC NB-23In-service inspections, repairs, alteration, re-
Slide 4
rates
ANSI / ASHRAE
ANSI/ASHRAE 15 ANSI/ASHRAE 15Safety Standard for Refrigeration SystemsRefrigeration Systems
Slide 5
IIAR
Process Safety Management Guidelines for Ammonia Refrigeration (update coming soon)
Ammonia Refrigeration Piping Handbook Ammonia Data Book Ammonia Data Book
(chemical and technology PSI resource)
Oil D i i G id li Oil Draining Guidelines
Slide 6
IIAR
ANSI/IIAR Standard 2Equipment, Design, and Installation of Closed-Circuit Ammonia Mechanical Refrigeration SystemsRefrigeration Systems
Bulletin No. 107Suggested Safety and Operating Procedures When Making Ammonia Refrigeration Plant Tie InsRefrigeration Plant Tie-Ins
Bulletin No. 108Slide 7
Guidelines for Water Contamination in Ammonia Refrigeration Systems
IIAR
Bulletin No. 109Guidelines for IIAR Minimum Safety Criteria for a Safe Ammonia Refrigeration System
Bulletin No. 110Guidelines for Start-Up, Inspection, and Maintenance of Ammonia Mechanical Refrigeration Systems
Bulletin No. 111Guidelines for Ammonia Machinery Room
Slide 8
Ventilation
IIAR
Bulletin No. 112Guidelines for Ammonia Machinery Room Design
Bulletin No. 114Guidelines for Identification of Ammonia Refrigeration Piping and System Components
Bulletin No. 116Bulletin No. 116Guidelines for Avoiding Component Failure in Industrial Refrigeration Systems Caused by
Slide 9
Abnormal Pressure or Shock
NIOSH
Publication No. 79-120Working Safely with Anhydrous Ammonia
Publication No. 79-119A Guide for Developing a Training Program for Anhydrous Ammonia Workers
Slide 10
RMA
Publication IP-14Publication IP 14Specifications for Anhydrous Ammonia Hose
Publication IP-11-2 Hose Technical Bulletin - Manual for UseHose Technical Bulletin Manual for Use, Maintenance, Testing, and Inspection of Anhydrous Ammonia Hose
Slide 11
Slide 12
ANSI/ASHRAE 15
Safety Code for Mechanical RefrigerationSafety Code for Mechanical Refrigeration
Establishes safeguards for personnel and propertyproperty
Applies to: Design, construction, test, installation,
operation, and inspection Modifications (non-RIK) Substitutions of refrigerants
Slide 13
Subst tut o s o e ge a ts
ANSI / IIAR Standard 2
Standard for Equipment, Design & Installation of Ammonia Mechanical Refrigerating Systems
Applies to closed-circuit mechanical refrigeration systems
Provides minimum requirements for:Equipment Equipment
Machinery room design
Slide 14
Installation of systems
IIAR Bulletin No. 109
Minimum Safety Criteria for a SafeMinimum Safety Criteria for a Safe Ammonia Refrigeration System
Identifies mandatory safety requirements Identifies mandatory safety requirements Provides safety inspection checklists
to be performed annually
References other codes and standards as e e e ces ot e codes a d sta da ds asbasis for checklists
Slide 15
IIAR Bulletin No. 110
Start-Up, Inspection, and Maintenance ofStart Up, Inspection, and Maintenance of Ammonia Mechanical Refrigerating Systems
Startup StartupPSSR, Evacuation, Dehydration, Leak Checking, Charging Testing Protective DevicesCharging, Testing Protective Devices
I&MSystem Log/inspection Compressors PVs andSystem Log/inspection, Compressors, PVs, and HEs, Pumps, Valves, Piping, Oil, Motors
Provides example ITPM planSlide 16
Provides example ITPM plan
IIAR Bulletin No. 110
System log/inspection at least dailySystem log/inspection at least daily (example in Appendix I)
Slide 17
IIAR Bulletin No. 110
Appendix GAppendix G
Typical Inspection and Maintenance Plan
Slide 18
IIAR Bulletin No. 111
Ammonia Machinery Room VentilationAmmonia Machinery Room Ventilation
Ventilation DesignEAC Emergency Vent Rate FanEAC, Emergency Vent Rate, Fan Selection & Layout, Detectors, Controls
Operation & MaintenanceFans/Intakes, Room Pressure, Detectors, ControlsControls
Slide 19
IIAR Bulletin No. 111
Slide 20
IIAR Bulletin No. 114
Identification of Ammonia RefrigerationIdentification of Ammonia Refrigeration Piping and System Components
Comprehensive labeling scheme Comprehensive labeling scheme Label size Colors Locations Label material requirements
Slide 21
Equipment-specific Requirements
Slide 22
Alarms & Detectors
Each machinery room is equipped withEach machinery room is equipped with ammonia detection that alarms and starts ventilation at a concentration of no higher than 1,000 ppm (ASHRAE-15, 8.11.2.1)
Detector alarms annunciate with visualDetector alarms annunciate with visual and audible means both inside and outside each entrance to machinery room (ASHRA-15, 8.11.2.1)
Alarm is triggered when the continuousSlide 23
Alarm is triggered when the continuous ventilation system fails (IIAR-111, 3.5.3)
Alarms & Detectors
A high-range detector will automaticallyA high range detector will automatically shut down all unclassified equipment in the machinery room at no more than 15,000 ppm (IIAR-111, 3.5.2)
Must be manual reset type with the resetMust be manual reset type with the reset located inside the refrigerating machinery room (ASHRAE-15, 8.11.2.1)
The meaning of each alarm shall be clearly marked by signage near the
Slide 24
clearly marked by signage near the annunciators (ASHRAE-15, 8.11.2.1)
Compressors
Fitted with high pressure cutoutsFitted with high pressure cutoutsthat unload the machine at 90% of the pressure relief valve set pressure (ASHRAE-15, 9.9)
Moving parts are guardedMoving parts are guarded(ASHRAE-15, 8.2)
Located such that there is Located such that there is unobstructed access for both normal and emergency tasks
Slide 25
normal and emergency tasks (ASHRAE-15, 8.3)
Compressors
Must have both suction and dischargeMust have both suction and discharge shut-off valves (ASHRAE-15, 9.12.4)
Fitted with nameplates that include: Fitted with nameplates that include: manufacturer, identification number, design pressures and refrigerant useddesign pressures, and refrigerant used (IIAR-2, 6.1.4)
Each must be identified with signage with Each must be identified with signage with lettering greater than 0.5" in height (ASHRAE-15 11 2 2)
Slide 26
(ASHRAE 15, 11.2.2)
Compressors
Each compressor has a high dischargeEach compressor has a high discharge temperature and pressure cutout(IIAR-2, 6.1.2.2)
Each compressor has a low suction pressure cutout (IIAR-2 6 1 2 2)pressure cutout (IIAR 2, 6.1.2.2)
Each compressor package with an oil pump has an oil flow failure indicatorpump has an oil flow failure indicator(more than just checking oil pressure and DP) (IIAR-2 6 1 2 2)
Slide 27
DP) (IIAR 2, 6.1.2.2)
Design Pressures
High-side components on systemsHigh side components on systems 250 psig - evaporative condensing
300 psig air cooled condensing 300 psig air-cooled condensing(IIAR-2, 6.1 and 9.1)
Low-side components are rated for MAWPs of 150 psig or greater (IIAR-2, 9 1)9.1)
Slide 28
Machinery / Engine Room
Head room of at least 7.25 ft below equipment it t d (ASHRAE 15situated over passageways (ASHRAE-15,
8.11.1)
Self-closing, tight-fitting doors that open outward (ASHRAE-15, 8.11.2)
No other wall penetrations that would allow ammonia tothat would allow ammonia to other parts of building (ASHRAE-15, 8.11.2)
Slide 29
( , )
Machinery Room
Emergency ventilation amount is greaterEmergency ventilation amount is greater than 100 times the square-root of the charge of refrigerant in pounds(ASHRAE-15, 8.11.5)
Continuous ventilation amount is at leastContinuous ventilation amount is at least 0.5 cfm/ft2 or 20 cfm/person(ASHRAE-15, 8.11.5 and IIAR-111, 3.2.3)
Slide 30
Machinery Room
Does not permanently contain equipmentDoes not permanently contain equipment with continuous operating surface temperatures in excess of 800F[ASHRAE-15, 8.12(a)]
Walls are noncombustible and at leastWalls are noncombustible and at least one-hour fire resistive construction [ASHRAE-15, 8.12(c)]
At least one door opens directly outside but not under a fire escape/open stairway
Slide 31
but not under a fire escape/open stairway [ASHRAE-15, 8.12(d),(e)]
Machinery Room
Emergency shutdown control of is locatedEmergency shutdown control of is located