Anhydrous ammonia, or ammonia that lacks water, is an incredibly important chemical for agriculture. Canada the safety of piping systems is a concern in facilities worldwide. Anhydrous ammonia, safety standards for chapter 296826 wac. Asmeansi b16 standards for pipes and fittings the asme b16 standards covers pipes and fittings in cast iron, cast bronze, wrought copper and steel. Who it applies to employers that store or transfer anhydrous ammonia. Kessler, senior process safety engineer introduction. Parkers series 7262 anhydrous ammonia hose provides superior service in agricultural and industrial applications.
There are twentyeight oshaapproved state plans, operating statewide occupational safety and health programs. The documents define the application design, construction rules, and. Safety and health topics ammonia refrigeration standards. Protect refrigeration equipment like pipes, valves. Use iron or steel tanks and piping, and valves especially designed for ammonia service. International institute of ammonia refrigeration 1001 north fairfax street suite 503 alexandria, va 22314. It was installed before february 8, 1973, and was approved, tested, and installed in accordance with either the provisions of the american national standard for the storage and handling of anhydrous ammonia, k61. Regulatory oversight on cfc, hcfc, and other synthetic refrigerants, have refocused attention on ammonia to. Mechanical integrity inspections for ammonia refrigeration. The standards of quality for anhydrous ammonia differ depending on the. This is the case of both the ansiashrae 15 and ansiiiar 2 which are referenced in the imc. Topic welding industry metallurgy nh3 anhydrous ammonia piping question by jack richey date 09232008 12. Article 712 anhydrous ammonia regulation chapter 71201 anhydrous ammonia standards 71202 anhydrous ammonia nurse tank and storage container lock pilot program repealed 71203 risk management program for agricultural anhydrous ammonia facilities chapter 71201 anhydrous ammonia standards section 7120101 adoption of standards. Storage and handling of anhydrous ammonia ansi blog.
Ammonia refrigeration is addressed in osha standards for general industry. Globally, there is a growing interest in ammonia as a refrigerant, both by itself, and in cascade refrigeration systems with carbon dioxide and other secondary system designs. A list of the federal laws and regulations related to process safety, accident prevention, emergency planning, and release reporting may be found in appendix c. Piping, valves, and fittings for liquid and vapor lines. Anhydrous ammonia code of practice fertilizer canada. The success of the 36th annual meeting of the international institute of ammonia refrigeration is due to the quality of the technical papers in this volume and the labor of its authors. It is used and stored under high pressures, which requires specially designed and wellmaintained equipment.
Standard for safe design of closedcircuit ammonia refrigeration systems chairman iiar task group charged with international mechanical code changes reta ncees ashrae refrigeration chair and board of governors education b. Because copper and copperbearing materials are attacked by ammonia, they are not used in ammonia piping systems. All equipment used to handle, store, transfer, or apply anhydrous ammonia must be properly engineered, constructed, and maintained in compliance with all applicable regulations, standards, and. Liquid ammonia pipeline pipelines, piping and fluid. Chapter 14 storage and handling of anhydrous ammonia nh3 summer 2007 secretariat compressed gas association, inc. Ammonia means anhydrous ammonia for use as a fertilizer through a system as defined in paragraph s of this rule. Pipe marking for anhydrous ammonia creative safety supply blog. How to meet iiar standards for ammonia pipe marking graphic. The cover features dual green stripes for easy identification, and resists abrasion, chemicals and weathering for maximum durability and. Ul 125 standard for flow control valves for anhydrous. Standards are often developed by a professional organization, group or a committee. This section highlights osha standards and documents related to ammonia refrigeration. These standards were published by the international institute for ammonia refrigeration iiar and are typically used wherever ammonia is present.
Standards follow good manufacturing practice gmp which is mandatory for organizations undertaking piping systems design. Ammonia is a commonly used chemical in commercial and household cleaners. A all piping, tubing and fittings shall be made of material suitable for anhydrous ammonia service. All welded piping shall be fabricate and tested in accordance with the ans standards code for pressure piping, section 3, petroleum refinery piping b31.
Jul 26, 2016 anhydrous ammonia, or ammonia that lacks water, is an incredibly important chemical for agriculture. It takes excessive temperatures about 840 to 930 f to cause it to dissociate slightly at atmospheric pressure. Any motor vehicle designed or used for the transportation of anhydrous ammonia that has either. Standards are not codes and should not be referred to as the ashrae code or the iiar code. Ammonia stress corrosion cracking can also affect carbon steel equipment, but unlike the cracking mechanism on brass which occurs in an aqueous solution, the cracking of steel equipment occurs in anhydrous ammonia. Piping codes, standards, and specifications pdf free download. The braided textile reinforcement provides corrosion and kink resistance for operator safety. The iiar standard can be used along with other standards if necessary.
This standard is intended to apply to the design, construction, location, installation, and operation of anhydrous ammonia systems including refrigerated ammonia storage systems. The diagrams are not intended to present an exhaustive range of. A list of the federal laws and regulations related to process safety, accident prevention, emergency planning, and. The design of piping, flanges and fittings shall comply with the requirements of relevant standard, and the design pressure, except for vapour lines from. Ball valves for anhydrous ammonia have vented balls.
Because of this, properly labeling ammoniacarrying pipes is critical for safety and. Under normal conditions, ammonia is a very stable compound. State plans are required to have standards and enforcement programs that. Use only stainless steel, carbon steel or black iron for anhydrous ammonia containers or piping.
How to meet iiar standards for ammonia pipe marking. Steel piping, fittings, and valves of the proper pressure rating are suitable for ammonia gas and liquid. Thermal expansion of liquid ammonia will cause extremely high pressures. The solubility characteristics of ammonia in water allows an aqueous ammonia solution to be formed which replaces the anhydrous ammonia refrigerant.
The leading advocate for the safe, reliable and efficient use of ammonia and other natural refrigerants. Article 712 anhydrous ammonia regulation chapter 71201 anhydrous ammonia standards. The rules in this book are effective december 2015. Guidelines for identification of ammonia refrigeration piping and system components introduction uniform guidelines for identifying ammonia refrigeration piping and system components will promote safety, facilitate maintenance and provide vital information to emergency service personnel. To improve the safety of ammonia refrigeration piping and system components, the international institute of ammonia refrigeration iiar has a guideline for labeling them. Origination date 6271974 compliance assistance library 02252016 anhydrous ammonia 1. There is also a set of standards developed specifically for ammonia pipes. Safety standards for these inspections have been adopted from the national fire protection association nfpa. These are a set of documents that considered to be appropriate. Refrigeration plants where ammonia is used solely as a refrigerant. However, regulations generally require that all repairs and modifications comply with the asme code or transport canada requirements.
A hydrostatic relief valve shall be installed between each pair of shutoff valves in the liquid ammonia piping or hose where liquid may be trapped so as to relieve into the. Anhydrous ammonia fifth edition, 1999 nebraska state fire marshal title 153 n. Anhydrous ammonia, safety standards for chapter 296826. Mechanical integrity inspections for ammonia refrigeration systems keys for establishing protocols at food industry facilities techbriefs 2006 no. I noticed that the solenoids are not listed for hazardous locations. But the standards may be interpreted as best industry practice, and may by reference be enforced as part of a code. Anhydrous ammonia system piping requirements minnesota. Managing the risks ae1149, revised june 2016 anhydrous ammonia has the potential to be one of the most dangerous chemicals used in agriculture today. All standards or specifications call for some maximum assay or content of ammonia, some maximum content of moisture and some maximum content of oil. Asme valve standards an overview of the american society of mechanical engineers asme valve standards. The occupational safety and health administration osha sets requirements for the design.
Our bright and durable ammonia pipe labels resist fading and deterioration. First published in 1991, bulletin 114 is now accepted as an industry standard, and was based off similar standards from ansi. Hydrostatic relief valves on piping system prevent over pressurizing. Liquid ammonia piping do not block in piping system and components when full of liquid ammonia. Ammonia system which correctly addresses all of the above issues peculiar to ammonia as a. Carbon steel in anhydrous ammonia can suffer from scc stress corrosion cracking. Health hazard information sheet ammonia refrigerant i.
Ammonia piping should conform to asme standard b31. In industry, ammonia is used in petroleum refining, to manufacture pharmaceuticals, to disinfect water, and as a refrigerant. Anhydrous ammonia system piping requirements this fact sheet was prepared by the minnesota department of agriculture to provide information on some of the state of minnesota requirements for facilities, which store, handle and use anhydrous ammonia on their premises. California code of regulations, title 8, section 507. Piping, tubing and tslot framing hose specialty hose anhydrous ammonia hose, series 7262. Preface water contamination of the ammonia refrigerant is common in many refrigerating systems. Bulletin 114 has for over 20 years focused on correct labeling of pipe and equipment in an industrial ammonia refrigeration system. Assay measurements are given in percent while moisture and oil. All refrigerated piping shall conform to the refrigeration piping code, american national standards institute, b31. Ammonia refrigeration iiar updated pipe marking standards for ammonia. Pipe marking for anhydrous ammonia creative safety supply. In 2014, the international institute of ammonia refrigeration iiar updated pipe marking standards for ammonia under bulletin 114 identification of ammonia refrigeration piping and system components.
This manual summarizes the requirements of environmental and safety laws for anhydrous ammonia refrigeration system operators. In agriculture, ammonia can be used for crop processing, fertilizers, or as an antifungal treatment for citrus. All other valves and fittings shall be of a type suitable for use with anhydrous ammonia and shall have a pressure rating of at least 400 psi wog. Those who work with anhydrous ammonia must be trained to follow. Welders making welds to anhydrous ammonia system piping must be certified in accordance with asme code, section ix, and must furnish a current qw484 qualification form upon request. There is a remote possibility that close proximity to an ammonia refrigeration system or associated piping when there is a catastrophic release could result in an acute exposure to anhydrous ammonia in its liquid form. Anhydrous ammonia quality the standards of quality for anhydrous ammonia differ depending on the manufacturer. Safety standards for chemical production facilities, refineries, petroleum, and related industries are grouped below as an overview of standards commonly used in chemical plants, oil platforms, refineries, and other chemical production and processing sites. Iiar safe and efficient use of natural refrigerants. We are wiring some 12vdc emergency shut off solenoids on a 25,000 gal anhydrous ammonia bullet tank pump that is used to fill gal portable tanks for farm applications. The primary article is titled the color conundrum iiar defines piping convention and announce to some changes that will be happening to bulletin 114 that will be rereleased in 2014. Ammonia azane 1 or r717 was among the early refrigerants, first used in 1850 in france2.
Pipe marking for anhydrous ammonia creative safety. B all piping, tubing and fittings shall be designed for a pressure not less than the maximum pressure to which they may be subjected in service. Anhydrous ammonia safety data sheet tanner industries. They also meet iiar standards for ammonia refrigeration and pipe identification, and they come in various styles and legends, including opticode medium temperature and high temperature recirculated suction, setmark low temp recirculated liq, and ultramark hot gas. Aboveground storage tanks, fuel dispensing devices, as well as piping, valves, and fittings, are inspected to ensure they are safe. Containing one part nitrogen and three parts hydrogen, ammonia is a source of nitrogen for many commercial fertilizers, and anhydrous ammonia can be directly applied to crop soil after it has been pressurized to maintain a liquid composition.
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