nh3 refrig ragagep

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  • For Official Use Only

    Ammonia RefrigerationAmmonia Refrigeration


    For Official Use Only

  • Objectives

    Gain a basic understanding of: Gain a basic understanding of: RAGAGEPs unique to Ammonia

    RefrigerationRefrigeration Equipment-specific RAGAGEP


    Again, this is an overview discussion. There is usually an exception to most rules

    Slide 2

  • RAGAGEP Organizations



    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



    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


  • 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


    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


    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,

    Detector alarms annunciate with visualDetector alarms annunciate with visual and audible means both inside and outside each entrance to machinery room (ASHRA-15,

    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,

    The meaning of each alarm shall be clearly marked by signage near the

    Slide 24

    clearly marked by signage near the annunciators (ASHRAE-15,

  • 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,

    Each compressor has a low suction pressure cutout (IIAR-2 6 1 2 2)pressure cutout (IIAR 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,

  • 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,


    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