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AMERICAN NATIONAL STANDARD K61.1-1981 \ and charged only in the open atmosphere or in 2.12.8 Excess flow valves or other protective buildings provided for that purpose. devices should be installed to prevent discharge s used for transferrin ammonia of the contents of containers if loading or 2.12.6 Pumps g unloading connectors or valves are cleanly shall be recommended and labeled for ammonia broken.Piping shall be sized so as not to restrict service by the manufacturer. flow to rates such that the protective devices will 2.12.6.1 Positive displacement pumps shall not function. If excess flow valves cannot be- be equipped with a pressure actuated by-pass installed to provide adequate protection,remotely valve on the discharge side of the pump. This operated internal or external shut-off valves valveshall operate to limit the pressure developed shall be installed. by the pump to the maximum for which the pump 2.12.9 Meters used for the measurement of is rated. Piping or tubing sized to carry the full liquid anhydrous ammonia shall be recom- capacity of the pump at the actuation pressure of mended and labeled for ammonia service by the this valve shall connect the discharge of this valve manufacturer. with the container from which ammonia is being pumped. If this line is capable of being valved 2.12.9.1 Liquid meters shall be designed for closed, an additional by-pass device shall be a minimum working pressure of 250 psig(1720 incorporated in the pump to by-pass back to the kPa). suction port.The pressure actuated by-passvalve 2,12.9.2 The metering system shall incor- and the return piping ortubing shall be installed ' porate devices that will prevent the inadvertent in accordance with the pump manufacturer's measurement of vapor. recommendations. 2.12.6.2 On the discharge side of the pump, 2.13 Tank Car Unloading Points before the relief valve line, install a pressure and Operations gage graduated from 0 to 400 psig(0-2758 kPa). 2,13.1 Provisions for unloading tank cars shall 2.12.6.3 Plant piping shall contain shut-off conform to the Regulations of the Department of valves located as close as practical to pump Transportation. v connections. 2.13.2 Unloading operations shall be per- 2.12.7 Compressors used for transferring or formed by reliable persons properly instructed refrigerating ammonia shall be recommended and made responsible for careful compliance and labeled for ammonia service by the with all applicable procedures. manufacturer. 2.13.3 Caution signs shall be so placed on the 2.12.7.1 Compressors,except those used for track or car as to give necessary warning to refrigeration, shall be designed for at least 250 persons approaching the car from the open end or psig(1720kPa)working pressure.Crank cases of ends of the siding.The signs shall remain in place compressors not designed to withstand system until the car is unloaded and disconnected from pressure shall be protected with a suitable pres- the discharge connections. sure relief valve. 2.13.4 The track of a tank car siding shall be 2.12.7.2 Plant piping shall contain shut-off substantially level. valves located as close as practical to compressor 2,13.5 Brakes shall be set and wheels blocked connections. on all cars being unloaded. 2.12.7.3 A pressure relief valve large enough 2,13.6 Tank cars of anhydrous ammonia shall to discharge the full capacity of the compressor be unloaded only at approved locations meeting shall be connected to the discharge before any the requirements of paragraphs 2.10.3 and 2.12.8. shut-off valve. 2.12.7.4 Compressors shall have pressure 2,14 Liquid Level Gaging Device gages at suction and discharge graduated to at least one and one-half times the maximum 4.1 Each container except those filled by wei pressure that can be developed. g 4ni pP approved id 2.12.7.5 Adequate means,such as drainable level gaging device. liquid trap, may be provided on the compressor 2.14.2 All gagingdevicesshall be arranged so suction to minimize the entry of liquid into the that the maximum liquid level to which the compressor. container is filled is readily determined. (See 2.12.7.6 Where necessary to prevent con- 2.3.2(g)] tamination,an oil separator shall be provided on 2.the 14.3 t to the atmosphere devices that require such then tory of the discharge side of the compressor. P P 15