Easily liquefied under pressure.] F. or provided the charging of the container is stopped at the first indication of frost or ice formation on its outside surface and is not resumed until such frost or ice has disappeared. ... OSHA (lbs.) Excess flow valves shall be designed with a bypass, not to exceed a No. At a concentration of only 50 parts per million (ppm), one sniff tells what is in the air. Each filling connection shall be provided with combination back-pressure check valve and excess-flow valve; one double or two single back-pressure check valves; or a positive shutoff valve in conjunction with either an internal back-pressure check valve or an internal excess flow valve. ammonia, OSHA, including OSHA Ammonia Sign ODE-38000, Portrait OSHA Anhydrous Ammonia Sign With Symbol ODEP-1270-R US-made signs and labels The refrigeration system shall be arranged with suitable controls to govern the compressor operation in accordance with the load as evidenced by the pressure in the container(s). Fittings shall comply with paragraph (b)(6) of this section. Where more than two compressors are provided minimum standby equipment equal to the largest normally operating equipment shall be installed. For the purposes of this paragraph (b)(1), refer to 1910.7 for definition of nationally recognized testing laboratory. The total refrigeration load shall be computed as the sum of the following: Load imposed by heat flow into the container caused by the temperature differential between design ambient temperature and storage temperature. If vent lines are installed to conduct the vapors from the relief valve, the back pressure under full relieving conditions shall not exceed 50 percent of the start-to-discharge pressure for pressure balanced valves or 10 percent of the start-to-discharge pressure for conventional valves. To improve the safety of ammonia refrigeration piping and system components, the International Institute of Ammonia Refrigeration (IIAR) has a guideline for labeling them: Bulletin No. Containers once installed under ground shall not later be reinstalled above ground or under ground, unless they successfully withstand hydrostatic pressure retests at the pressure specified for the original hydrostatic test as required by the code under which constructed and show no evidence of serious corrosion. All containers shall be equipped with vapor return valves. The standard … Regulation equipment may be connected directly to the tank coupling or flange, in which case a flexible connection shall be used between such regulating equipment and the remainder of the liquid withdrawal system. This standard is intended to apply to the design, construction, location, installation, and operation of anhydrous ammonia systems including refrigerated ammonia storage systems. An emergency source of power of sufficient capacity to handle the loads listed in paragraphs (d)(8)(i) (a) and (b) of this section shall be provided unless facilities are available to safely dispose of vented vapors while the refrigeration system is not operating. The document shall set forth the test bases, test data and results, and also the qualifications of the certifying person. Every container shall be supported to prevent the concentration of excessive loads on the supporting portion of the shell. Hose assemblies, when made up, shall be capable of withstanding a test pressure of 500 p.s.i.g. Ammonia Safety. Compressors shall be designed for at least 250 p.s.i.g. 54 drill size unless provided with an excess flow valve. Anhydrous ammonia (NH3) is a hazardous chemical and must be dealt with carefully. Safety Standards for Ammonia Refrigeration (PDF) (2 pp, 157 K) Hose and hose connections located on the low-pressure side of flow control of pressure-reducing valves shall be designed for a bursting pressure of not less than 5 times the pressure setting of the safety relief devices protecting that portion of the system but not less than 125 p.s.i.g. No excess flow valve is required in the liquid withdrawal line provided the controlling orifice between the contents of the container and the outlet of the shutoff valve does not exceed seven-sixteenths inch in diameter. NIOSHTIC-2 search results for ammonia – NIOSHTIC-2 is a searchable database of worker safety and health publications, documents, grant reports, and journal articles supported in whole or in part by NIOSH. All foundations shall extend below the frost line. The container, prior to being placed under ground, shall be given a corrosion resisting protective coating. The applicator tank may be filled by venting to open air provided the bleeder valve orifice does not exceed seven-sixteenths inch in diameter. Openings from the container or through fittings attached directly on the container to which pressure gage connections are made need not be equipped with excess flow valves if such openings are not larger than No. Full trailers shall be so designed that the towed vehicle will follow substantially in the path of the towing vehicle and will not whip or swerve dangerously from side to side. Such hose shall be equipped with approved shutoff valves at the discharge end. With the name and address of the builder and the date of fabrication. Gage glasses of the columnar type shall be restricted to stationary storage installations. and a minimum burst pressure of 1,750 p.s.i.g. An emergency alarm and shutoff shall be located in the condenser system to respond to excess discharge pressure caused by failure of the cooling medium. Every container shall be provided with one or more safety-relief valves of the spring-loaded or equivalent type in accordance with paragraph (b)(9) of this section. All piping, tubing, and fittings shall be made of material suitable for anhydrous ammonia service. Full-face masks with ammonia canisters that have been approved by NIOSH under 42 CFR part 84 are suitable for emergency action involving most anhydrous ammonia leaks, particularly leaks that occur outdoors. Paragraph (b) of this section applies to this paragraph unless otherwise noted. The vent lines shall be installed to prevent accumulation of liquid in the lines. The rate of the discharge shall be in accordance with the provisions of Table H-36. All manholes or housings shall be provided with ventilated louvers or their equivalent, the area of such openings equaling or exceeding combined discharge areas of safety-relief valves and vent lines which discharge their content into the manhole housing. They shall be equipped with shutoff valves having metallic handwheels, with excess-flow valves, and with extra heavy glass adequately protected with a metal housing applied by the gage manufacturer. All refrigerated piping shall conform to the Refrigeration Piping Code, American National Standards Institute, B31.5-1966 with addenda B31.1a-1968, which is incorporated by reference as specified in § 1910.6, as it applies to ammonia. Note that this standard does not constitute a comprehensive detailed Relief valves for refrigerated storage containers shall be self-contained spring-loaded, weight-loaded, or self-contained pilot-operated type. Any pump, except a constant speed centrifugal pump, shall be equipped with a suitable pressure actuated bypass valve permitting flow from discharge to suction when the discharge pressure rises above a predetermined point. The maximum allowable water level to which the container may be filled for test purposes. All liquid and vapor connections to containers except filling pipes, safety relief connections, and liquid-level gaging and pressure gage connections provided with orifices not larger than No. The standard applies to the storage or possession of FGAN in all industries except transportation and U.S. Coast Guard-regulated facilities. Such pipe shall be at least schedule 40 when joints are welded, or welded and flanged. System nameplates, when required, shall be permanently attached to the system so as to be readily accessible for inspection and shall include markings as prescribed in subdivision (ii) of this subparagraph. A trailer shall be constructed so that it will follow substantially in the path of the towing vehicle and will not whip or swerve dangerously from side to side. The shell or head thickness of any container shall not be less than three-sixteenths inch. Markings shall be in increments of not more than 20 deg. If the pressure setting adjustment is external, the relief valves shall be provided with means for sealing the adjustment. This volume when converted to weight shall not exceed the filling density specified by the DOT. With the density of the product in pounds per cubic foot for which the container was designed. Pressure gages of bourdon-tube type shall be installed on the suction and discharge of the compressor before the shutoff valves. Filling compressors may be used as standby equipment for holding compressors. A suitable "hold down" device shall be provided which will anchor the container to the vehicle at one or more places on each side of the container. Arrange ammonia standards in sampler in order of decreasing concentration of nitrogen. OSHA’s AN standard. F. and atmospheric pressure; and with the manufacturer's name and catalog number. Where hose is to be used for transferring liquid from one container to another, "wet" hose is recommended. working pressure. Ammonia is considered a high health hazard because it is corrosive to the skin, eyes, and lungs. Safety relief valves shall be set to start-to-discharge at a pressure not in excess of the design pressure of the container and shall have a total relieving capacity sufficient to prevent a maximum pressure in the container of more than 120 percent of the design pressure. Consideration shall be given to the physiological effects of ammonia as well as to adjacent fire hazards in selecting the location for a storage container. Should ground conditions make compliance with these requirements impracticable, installation shall be made otherwise to prevent physical damage. Electrical equipment and wiring for use in ammonia installations shall be general purpose or weather resistant as appropriate. Because ammonia is harmful to human health - it is corrosive to the eyes, skin, and lungs - any pipes carrying these ammonia-based substances must have more specific labeling than those under the ANSI/ASME standards. of anhydrous ammonia it would be covered by OSHA's Process Safety Management (PSM) standard (29 CFR 1910.119). In lieu of this requirement the same information may be contained on a nameplate permanently attached to the hose. Suitable provision shall be made for draining condensate which may accumulate in the discharge pipe. Anhydrous ammonia, Aqua ammonia, Aqueous ammonia [Note: Often used in an aqueous solution.] Ammonia is a commonly used chemical in commercial and household cleaners. F. With the total outside surface area of the container in square feet. All vehicles shall carry a can containing 5 gallons or more of water. If desired, vent pipes from two or more safety-relief devices located on the same unit, or similar lines from two or more different units may be run into a common discharge header, provided the capacity of such header is at least equal to the sum of the capacities of the individual discharge lines. When the cradle and the tank are not welded together suitable material shall be used between them to eliminate metal-to-metal friction. Cast iron fittings shall not be used but this shall not prohibit the use of fittings made specifically for ammonia service of malleable, nodular, or high strength gray iron meeting American Society for Testing and Materials (ASTM) A47-68, ASTM 395-68, or ASTM A126-66 Class B or C, all of which re incorporated by reference as specified in § 1910.6. All containers with a capacity exceeding 250 gallons shall be equipped for spray loading or with an approved vapor return valve. Storage and handling of anhydrous ammonia. This standard applies to the design, construction, location, installation, and operation of anhydrous ammonia systems including refrigerated ammonia storage systems. The compressor shall not be operated if either pressure gage is removed or is inoperative. Back slippage shall also be prevented by proper methods. Every full trailer or semitrailer shall have a reliable system of brakes, and adequate provision shall be made to operate the brakes from the driver's seat. "Certified" means it has been tested and found by a nationally recognized testing laboratory to meet nationally recognized standards or to be safe for use in a specified manner, or is of a kind whose production is periodically inspected by a nationally recognized testing laboratory, and it bears a label, tag, or other record of certification. The discharge from safety-relief valves shall be vented away from the container upward and unobstructed to the atmosphere. Containers for product storage at less than 32 deg. That portion of the container in contact with foundations or saddles shall be protected against corrosion. All containers with a capacity exceeding 250 gallons shall be equipped with a pressure gage having a dial graduated from 0-400 p.s.i. All gaging devices shall be arranged so that the maximum liquid level to which the container is filled is readily determined. ; Immediately Dangerous to LIfe or Health (IDLH) Value of ammonia– NIOSH reviews scientific data and researches methods for developing IDLH values. All appurtenances shall be designed for not less than the maximum working pressure of that portion of the system on which they are installed. Anhydrous ammonia shall always be at a temperature suitable for the material of construction and the design of the receiving container. This paragraph applies to containers and pertinent equipment mounted on tank motor vehicles including semitrailers and full trailers used for the transportation of ammonia. Load imposed by heat flow into the container caused by maximum sun radiation. Safety relief devices used in systems covered by paragraphs (c), (f), (g), and (h) of this section shall be constructed to discharge at not less than the rates required in paragraph (b)(9)(i) of this section before the pressure is in excess of 120 percent (not including the 10 percent tolerance referred to in paragraph (b)(9)(ii) of this section) of the maximum permitted start-to-discharge pressure setting of the device. The filling connection shall be fitted with combination back-pressure check valve and excess-flow valve; one double or two single back-pressure check valves; or a positive shutoff valve in conjunction with either an internal back-pressure check valve or an internal excess flow valve. Pumps shall be designed for at least 250 p.s.i.g. Each container shall have a fixed liquid-level gage. Safety-relief valves shall have direct communication with the vapor space of the container. Every full trailer shall be equipped with self-energizing brakes. Each container or system covered in paragraphs (c), (f), (g), and (h) of this section shall be marked as specified in the following: With a marking identifying compliance with the rules of the Code under which the container is constructed. The loading station involved in the investigation and other systems where anhydrous ammonia is used or stored are covered by OSHA's Storage and handling of anhydrous ammonia standard (29 CFR 1910.111) provided they are not ammonia manufacturing plants or refrigeration plants where ammonia is used solely as a refrigerant. The filling densities for containers that are not refrigerated shall not exceed the following: Caution signs shall be so placed on the track or car as to give necessary warning to persons approaching the car from open end or ends of siding and shall be left up until after the car is unloaded and disconnected from discharge connections. (i) This standard is intended to apply to the design, construction, location, installation, and operation of anhydrous ammonia systems including refrigerated ammonia storage systems. Shutoff valves shall not be installed between the safety-relief valves and the container; except, that a shutoff valve may be used where the arrangement of this valve is such as always to afford full required capacity flow through the relief valves. If the content of a container is to be determined by liquid-level measurement, the container shall have a thermometer well so that the internal liquid temperature can be easily determined. Brakes shall be set and wheels blocked on all cars being unloaded. Each vehicle transporting ammonia in bulk except farm applicator vehicles shall carry a container of at least 5 gallons of water and shall be equipped with a full face mask. 1910.111 (a) (1) (ii) This standard does not apply to: 1910.111 (a) (1) (ii) (a) Secure anchorage or adequate pier height shall be provided against container flotation wherever sufficiently high flood water might occur. If a liquid withdrawal line is installed in the bottom of a container, the connections thereto, including hose, shall not be lower than the lowest horizontal edge of the vehicle axle. 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, K61.1, or the Fertilizer Institute Standards for the Storage and Handling of Agricultural Anhydrous Ammonia, M-1, (both of which are incorporated by reference as specified in § 1910.6) in effect at the time of installation; or, It is accepted, or certified, or listed, or labeled, or otherwise determined to be safe by a nationally recognized testing laboratory; or, It is a type which no nationally recognized testing laboratory does, or will undertake to, accept, certify, list, label, or determine to be safe; and such equipment is inspected or tested by any Federal, State, municipal, or other local authority responsible for enforcing occupational safety provisions of a Federal, State, municipal or other local law, code, or regulation pertaining to the storage, handling, transport, and use of anhydrous ammonia, and found to be in compliance with either the provisions of the American National Standard for the Storage and Handling of Anhydrous Ammonia, K61.1, or the Fertilizer Institute Standards for the Storage and Handling of Agricultural Anhydrous Ammonia, M-1, in effect at the time of installation; or. 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