nh3 refrig ragagep

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