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Ammonia Refrigeration Rules

The information in the table below is our attempt at assembling a list of ammonia-refrigeration regulations, codes, and industry standards (rules) and their publication history.

This list is currently only includes Wisconsin state codes. Other state and local codes may be added later.

This information is provided for free, as is. Use at your own risk. Absolutely no warranty. There are probably some date and name errors, especially for older editions.

Change Log:
2017.12.18 -- Added entry for Wisconsin Commercial Building Code; building codes for each state should be checked. Updated entries for SPS 345 (website URL changed), IMC, ASME Boiler and Pressure Vessel Code, ASME B31.5, IIAR 2, proposed IIAR 6, IIAR 7, and proposed IIAR 9.
2017.11.03 -- Updated edition years for IIAR 1, IIAR 3, and IIAR Bulletin 114, updated status of IIAR 6 and IIAR 9, and clarified that IIAR Bulletins 107, 111, and 112 have been superseded by IIAR standards.
2017.01.26 -- Added entry for proposed IIAR 9. Updated entries for ASME B31.5, IIAR 2, IIAR 6 (proposed), and IIAR Bulletins.

29 CFR 1910.119 -- Title 29, Code of Federal Regulations (CFR), Section 1910.119. This is the Process Safety Management (PSM) regulation administered by the U.S. Department of Labor, Occupational Safety and Health Administration (OSHA). Federal Register (FR) publication and amendments: 57 FR 6403, Feb. 24, 1992; 57 FR 7847, Mar. 4, 1992, as amended at 61 FR 9238, Mar. 7, 1996; 67 FR 67964, Nov. 7, 2002; 76 FR 80738, Dec. 27, 2011; 77 FR 17776, Mar. 26, 2012; 78 FR 9313, Feb. 8, 2013. Available from http://gpo.gov or http://osha.gov

40 CFR 68 -- Title 40, Code of Federal Regulations, Part 68. This is the Chemical Accident Prevention/Risk Management Plan (RMP) regulation administered by the U.S. Environmental Protection Agency (EPA). Subpart D is the Program 3 Prevention Program. Federal Register (FR) publication and amendments: 59 FR 4493, Jan. 31, 1994. Redesignated at 61 FR 31717, June 20, 1996; 61 FR 31729, June 20, 1996; as amended at 62 FR 45132, Aug. 25, 1997; 63 FR 645, Jan. 6, 1998; 64 FR 980, Jan. 6, 1999; 64 FR 28700, May 26, 1999; 65 FR 13250, Mar. 13, 2000; 69 FR 18832, Apr. 9, 2004. Available from http://gpo.gov or http://epa.gov

SPS 345 (formerly Comm 45, ILHR 45, and Ind 45) -- Chapter SPS 345, Wisconsin Administrative Code. This is the state of Wisconsin's mechanical-refrigeration code, administered by the Division of Industry Services (formerly Safety & Buildings), Department of Safety and Professional Services (formerly Commerce). This code has a long history, for example, a revised edition of Ind 45 was published in March 1963. In September 1983 it was revised and renamed ILHR 45, and subsequently revised effective: September 1, 1994; November 1, 1996 (and renamed Comm 45); July 1, 2002; November 1, 2003 (which adopted the increased relief-vent (RV) pipes sizes in ASHRAE Addendum 15c-2000); September 1, 2010; January 1, 2012 (only renamed SPS 345); June 1, 2012; and October 1, 2013. Since September 1, 2010, this code has referenced ASHRAE 15-2007 (including addenda a to i) and IIAR 2-2008, which in turn reference the ASME codes described below. Guidance and information on any updates are available at https://dsps.wi.gov. The current and older editions of SPS 345, Comm 45, ILHR 45, and Ind 45 may be obtained by contacting the Legislative Reference Bureau http://legis.wisconsin.gov/lrb/

Wisconsin Commercial Building Code -- Chapter SPS 361 to 365, Wisconsin Administrative Code. As of December 18, 2017, this adopts the 2009 edition of the International Mechanical Code (IMC 2009). Available from the Legislative Reference Bureau http://legis.wisconsin.gov/lrb/

IMC -- International Mechanical Code (IMC). The IMC has been published every three years since 2000. IMC 2000 was adopted, in part, by Comm 45, Wisconsin Administrative Code, from November 1, 2003, to August 31, 2010. Regarding ammonia refrigeration, it has typically referenced and been mostly consistent with ASHRAE 15 and IIAR 2, with additional requirements. The IMC may be purchased from the International Code Council at http://www.iccsafe.org

ASHRAE 15 -- American National Standards Institute (ANSI)/American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE), Standard 15, "Safety Standard for Mechanical Refrigeration." ASHRAE 15 has been published every 3 years since 2001, with more frequent addenda (https://ashrae.org/standards-research--technology/standards-addenda) and interpretations (https://ashrae.org/standards-research--technology/standards-interpretations). The 2013 edition's forward indicates, "The first Safety Code for Mechanical Refrigeration, recognized as American Standard B9 in October 1930, appeared in the first edition, 1932-1933, of the ASRE Refrigerating Handbook and Catalog. ASRE revisions designated ASA B9 appeared in 1933 and 1939. ASRE revisions designated ASA B9.1 appeared in 1950, 1953, and 1958. After the formation of ASHRAE, editions appeared as ASA B9.1-1964, ANSI B9.1-1971, ANSI/ASHRAE 15-1978, ANSI/ASHRAE 15-1989, ANSI/ASHRAE 15-1992, ANSI/ASHRAE 15-1994, ANSI/ASHRAE 15-2001, ANSI/ASHRAE 15-2004, ANSI/ASHRAE 15-2007, and ANSI/ASHRAE 15-2010." ASHRAE publications may be purchased from http://ashrae.org

ASME Boiler and Pressure Vessel Code -- ASME (founded as the American Society of Mechanical Engineers) has published this code since 1914. Recent editions include 2010, 2013, 2015, 2017, and scheduled for every two years going forward -- possibly with more recent interpretations or code cases. ASME publications may be purchased from https://www.asme.org

ASME B31.5 -- "Refrigeration Piping and Heat Transfer Components." This code was separated from the power-piping code (B31.1) in 1962, and revised in 1966, 1974, 1978, 1983, 1987, 1989, 1992, 2001, 2006, and every three years since 2010, possibly with more frequent addenda and interpretations. ASME B31.5 covers materials, design, fabrication, assembly, erection, testing, and inspection. ASME publications may be purchased from https://www.asme.org

IIAR 1 -- ANSI/International Institute of Ammonia Refrigeration (IIAR), Standard 1, "Definitions and Terminology Used in IIAR Standards." The first edition was published in 2012. The next and latest edition was published in 2017. IIAR publications may be purchased from http://iiar.org

IIAR 2 -- ANSI/IIAR, Standard 2, "Safe Design of Closed-Circuit Ammonia Refrigeration Systems". The first edition was published in March 1974 as IIAR 74-2. Revised editions (or addenda) were published in 1984, December 1992, August 1999, October 2005, June 2008, August 2010, December 2012, and the latest 2014 edition was actually published in approximately December 2015. A public-review draft of changes was published on March 24, 2017. It was named "Equipment, Design, and Installation of Closed Circuit Ammonia Mechanical Refrigerating Systems" prior to the 2014 edition.

IIAR 3 -- ANSI/IIAR, Standard 3, "Ammonia Refrigeration Valves". IIAR 3-2005 was an "Informative Reference" of IIAR 2-2008. The first edition was published in 2005. Revised editions were published in 2012 and 2017.

IIAR 4 -- ANSI/IIAR, Standard 4, "Installation of Closed-Circuit Ammonia Refrigeration Systems". The first edition was published in 2015. This is the latest edition.

IIAR 5 -- ANSI/IIAR, Standard 5, "Start-up and Commissioning of Closed-Circuit Ammonia Refrigeration Systems". The first edition was published in 2013. This is the latest edition.

IIAR 6 (proposed) -- ANSI/IIAR, Standard 6, "Inspection, Testing, and Maintenance of Safe Closed-Circuit Ammonia Refrigeration Systems". The first edition has not yet been published. A public-review draft was published on March 30, 2017. As of December 18, 2017, the IIAR Standards Review webpage reads, "This proposed standard specifies minimum criteria for inspection, testing, and maintenance of closed-circuit ammonia mechanical refrigeration systems, including the ammonia side of a cascade refrigeration system."

IIAR 7 -- ANSI/IIAR, Standard 7, "Developing Operating Procedures for Closed-Circuit Ammonia Mechanical Refrigerating Systems". The first edition was published in 2013. This is the latest edition. A public-review draft was published on November 10, 2017.

IIAR 8 -- ANSI/IIAR, Standard 8, "Decommissioning of Closed-Circuit Ammonia Refrigeration Systems". The first edition was published in 2015. This is the latest edition.

IIAR 9 (proposed) -- ANSI/IIAR, Standard 9, "Recognized and Generally Accepted Good Engineering Practices (RAGAGEP) for Existing Closed-Circuit Ammonia Refrigeration Systems". The first edition has not yet been published. As of December 18, 2017, the IIAR Standards Review webpage reads, "This proposed standard will help companies ascertain whether or not their existing systems should be updated to reflect new requirements from newly published and revised standards. This standard provides a method of evaluating existing systems against requirements that should apply to all closed-circuit ammonia refrigeration systems regardless of age and will help determine what can or can't be "grandfathered" in regard to system design."

IIAR Bulletins -- These provide recommendations that are meant to be voluntary and non-binding, but which may become "good engineering practice" and therefore required under PSM and RMP regulations if they are widely followed. A partial list is below.
IIAR Bulletin 107 (1997 -- superseded), "Guidelines for: Suggested Safety and Operating Procedures When Making Ammonia Refrigeration Plant Tie-ins." Superseded by IIAR 5.
IIAR Bulletin 108 (1986), "Guidelines for: Water Contamination in Ammonia Refrigeration Systems." Includes water-content test method.
IIAR Bulletin 109 (1997), "Guidelines for: IIAR Minimum Safety Criteria for a Safe Ammonia Refrigeration System." Contains sample inspection forms.
IIAR Bulletin 110 (2002, revised in 2004 and 2007), "Guidelines for: Start-up, Inspection and Maintenance of Ammonia Mechanical Refrigerating Systems." Section 6.0 - Inspection and Maintenance contains information on mechanical integrity. Section 6.4 was revised in February 4, 2004. Section 6.6.3 was revised in May 24, 2007.
IIAR Bulletin 111 (2002 -- superseded), "Guidelines for: Ammonia Machinery Room Ventilation." Superseded by the ventilation requirements in the 2010 Addendum A of IIAR 2-2008 and IIAR 2-2014. But, provides diagrams of suggested air flow that are not in these standards.
IIAR Bulletin 112 (1998 -- superseded), "Guidelines for: Ammonia Machinery Room Design." Superseded by the 2010 Addendum A of IIAR 2-2008 and by IIAR 2-2014.
IIAR Bulletin 114 (1991, revised in 2014 and 2017), "Guidelines for: Identification of Ammonia Refrigeration Piping and System Components."
IIAR Bulletin 116 (1992), "Guidelines for: Avoiding Component Failure in Industrial Refrigeration Systems Caused by Abnormal Pressure or Shock."

IIAR updates and interpretations are available at the IIAR website http://iiar.org, under the "Technology and Standards" menu select "Standards Review" and then select "ANSI/IIAR Standards Interpretations". For the latest editions, under the "Store" menu select "Bulletins" or "Standards".


We place no restriction on the use, modification, or redistribution of the information above.

Originally Posted: 2015.04.30
Last Modified: 2017.12.18
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