Signs shall be of metal or other suitable material, at least 12 by 15 inches in size and bear the words "STOP - Tank Car Connected" or "STOP - Men at Work" the word, "STOP," being in letters at least 4 inches high and the other words in letters at least 2 inches high. OSHA Offers Clear Guidance for When to use Safety Signage. ... OSHA (lbs.) The OSHA Permissible Exposure Limit (PEL) for Anhydrous Ammonia is 50 parts per million (ppm) or 35 milligrams (mg)/cubic meter (m. 3). Safety-relief valves shall be so arranged that the possibility of tampering will be minimized. OSHA’s former exposure limit for ammonia was 50 ppm as an 8-hour TWA. Tubing made of brass, copper, or other material subject to attack by ammonia shall not be used. It involves the use of a liquid which if spilled may be irritating to the skin or may damage sampling pumps. You may need a PDF reader to view some of the files on this page. 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. This Ammonia Awareness Program (ISNetworld® RAVS®* Section), in addition to being a complete and functioning written safety program (chapter), it also contains all the required text elements that are sought by the ISNetworld RAVS® (Review And Verification Service) reviewer.This plan has been previously submitted and has achieved … Pump discharge shall also be equipped with a spring-loaded safety relief valve set at a pressure not more than 135 percent of the setting of the bypass valve or more than 400 p.s.i.g., whichever is larger. The container thus coated shall be so lowered into place as to prevent abrasion or other damage to the coating. When the surface area is not stamped on the nameplate or when the marking is not legible the area can be calculated by using one of the following formulas: Flow Rate - CFM Air = cubic feet per minute of air required at standard conditions, 60 deg. Provision shall be made to secure both ends of the hose while in transit. Provisions for unloading tank cars shall conform to the applicable recommendations contained in the DOT regulations. 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 excess flow valves shall be plainly and permanently marked with the name or trademark of the manufacturer, the catalog number, and the rated capacity. 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. Stationary storage installations shall have an easily accessible shower or a 50-gallon drum of water. The document shall set forth the test bases, test data and results, and also the qualifications of the certifying person. The track of a tank car siding shall be substantially level. 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. OSHA’s FGAN standard is based on 1970 edition of the National Fire Protection Association’s (NFPA) Code for the Storage of Ammonium Nitrate (NFPA 490). Electrical equipment and wiring for use in ammonia installations shall be general purpose or weather resistant as appropriate. DOT specifications - Regulations of the Department of Transportation published in 49 CFR Chapter I. See EPA’s About PDF page to learn more. Adequate means, such as drainable liquid trap, shall be provided on the compressor suction to minimize the entry of liquid into the compressor. There is no threshold quantity in the Anhydrous Ammonia Standard. Farm vehicles shall conform with State regulations. Back slippage shall also be prevented by proper methods. The Permissible Exposure Limit for ammonia set by OSHA is 50 parts per million (ppm) averaged over an eight hour work day. Such hose shall be equipped with approved shutoff valves at the discharge end. The OSHA Process Safety Management (PSM) standard (29 CFR 1910.119) was promulgated in . All appurtenances shall be fabricated from materials proved suitable for anhydrous ammonia service. Many of the requirements of the Process Safety Management Standard, 29 CFR 1910.119, are identified in this eTool as possible controls, and are useful as recommended practices, whether or not the ammonia refrigeration system is a covered process. F. and atmospheric pressure; and with the manufacturer's name and catalog number. Facilities located within one of the 27 OSHA State Plans should contact their State Plan office for the specific requirements in their state, which may differ but must be at least as effective OSHA standards. A thermometer well shall be provided in all containers not utilizing a fixed liquid-level gaging device. More than one storage container may be handled by the same refrigeration system. Containers shall be supported on suitable noncombustible foundations designed to accommodate the type of container being used. Containers built according to the Code do not have to comply with Paragraphs UG125 to UG128 inclusive, and Paragraphs UG132 and UG133 of the Code. 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