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AMERICAN NATIONAL STANDARD K61-1-1931 2.7.3 All piping shall be well supported and nections shall be designed, constructed, and provision shall be made for expansion and con- installed so that there will be no leakage when traction. All refrigeration system piping shall connected. conform to the Refrigeration Piping Code(ANSI B31.5),a Section of the American Standard Code 2.8.4 Where liquid transfer hose is not drained for Pressure Piping, as it applies to ammonia.- of liquid upon completion of transfer operations, such hose shall be equipped with an approved 2.7'A Piping used on non-refrigerated systems shut-off valve at the discharge end. Provision shall be at least ASTM A-53 Grade B Electric shall be made to prevent excessive hydrostatic Resistance Welded and Electric Flash Welded pressure in the hose. (See paragraph 2.9.10). Pipe or equal.Such pipe shall beat least Schedule 40 when joints are welded,or welded and flanged. 2.8.5 On all hose one half inch(12.7 mm)O.D. Such pipe shall be at least Schedule 80 when and larger,used in ammonia service and subject joints are threaded.Brass,copper,or galvanized to container pressure,there shall be etched,cast, steel pipe or tubing shall not be used. or impressed at five foot (1.52 m) intervals the 2.7.5 All metal flexible connections for following information: permanent installations shall have a minimum Anhydrous Ammonia working pressure of 250 psig(1720 kPa) (safety xxx psig(Maximum working pressure) factor of 4). For temporary installations, hose Manufacturer's Name or Trademark meeting the requirement of 2.8 may be used. Year of Manufacture 2.7.6 Cast iron fittings shall not be used but 2.9 Pressure Relief Devices this shall not prohibit the use of fittings made specifically for ammonia service of malleable or 2.9.1 Every container used in systems covered nodular iron such as Specification ASTM A47 or by Section 3,6,7 and 8 shall be provided with one ASTM A395. or more pressure relief valves of the spring- 2.7.7 Provisions shall be made for expan loaded or equivalent type. The discharge from p pressure relief valves shall be vented away from contraction,jarring, vibration, and for settling. the container, upward and unobstructed to the 2.7.8 Adequate provisions shall be made to atmosphere. All pressure relief valve discharge protect all exposed piping from physical damage openings shall have suitable raincaps that will that might result from moving machinery, the allow free discharge of thevaporand preventthe presence of automobiles or trucks, or any other entrance of water. Provision shall be made for undue strain that maybe placed upon thepiping. draining condensate which may accumulate.The rate of the discharge shall be in accordance with 2.7.9 Joint compounds shall be resistant to the provisions of Appendix A. ammonia. 2.9.2 Container pressure relief valves shall be 2.7.10 After assembly, all piping and tubing set to start-to-discharge as follows,with relation shall be tested and proved to be free from leaks at to the design pressure of the container: a pressure not less than the normal operating pressure of the system. Containers Minimum Maximum' ASME-U-68, U-69 110% 125% 2.8 Hose Specification ASME-U-200, U-201 95% 100% ASME 1952, 1956, 1959, 2.8.1 Hose used in ammonia service and 1962, 1965, 1968, 1971, subject to container pressure shall conform to the 1974. 1977 and 1980 95% 100% joint Rubber Manufacturers Association and The API-ASME 95% 100% Fertilizer Institute "Hose Specifications for U.S. Coast Guard. Anhydrous Ammonia"(See Appendix B). (As required by USCG regulations) 2.5.2 Hose subject to container pressure shall DOT (As required by DOT regulations) be designed for a minimum working pressure of 350 psig(2413 kPa) and a minimum burst pres. .A relief valve manufacturers tolerance of plus Io% is sure of 1750 psig(12,066 kPa). Hose assemblies, permitted. when made up,shall be capable of withstanding a 2,9.3 Pressure relief devices used ins stems test pressure of 500 psig(3450 kPa). covered by Sections 3, 6, 7 and 8 shall be con- 2.8.3 Hose and hose connections located on the structed to discharge at not less than the rates low pressure side of flow control or pressure required in 2.9.1 before the pressure is in excess reducing valves on devices discharging to of 120%(not including the 10%tolerance referred atmospheric pressure shall be designed for the to in 2.9.2) of the maximum permitted start-to- maximum low side working pressure. All con- discharge pressure setting of the device. 12