API Spec 6H:1998 pdf download.Specification on End Closures, Connectors and Swivels
4.3 TEMPERATURE RATINGS
a. The temperature range shall be established and marked on the fitting identification plate. b. For service temperatures below -20ºF (-29ºC), materials shall be certified in accordance with the appropriate ASTM material specifications for low temperature service. c. Maximum service temperature may be limited by either the nonmetallic seal ring or the metal used in the fitting. If the metal is the limiting temperature factor, the Maximum Oper- ating Pressure in Table 1 of this specification shall be derated as required for the specific materials listed in ASME Section VIII, Division 1.
4.4 MANUFACTURER’S HYDROSTATIC TEST
a. All fittings shall be subjected to a minimum hydrostatic test equal to or greater than 1.5 times the maximum operating pressure rating. There shall be no visible leakage or harmful inelastic deformation under the test pressure. b. All cast components and welds must be free of paint or lacquer during hydrostatic testing. c. If fitting weld ends are welded for hydrostatic testing, all weld metal and at least 3 / 16 inch [4.8 mm] of base metal must be machined off the weld end. No welding or machining (other than weld end preparation) shall be done on a fitting after hydrotest unless either the entire unit is retested, or all weld areas pass subsequent NDE. d. During the manufacturer’s hydrostatic test, the closed end(s) must not be restrained by fixtures such that the pres- sure load is not fully carried by the fitting under test. e. The duration of the hydrostatic test shall be a minimum of one hour. f. After testing, nonmetallic seals may be replaced and all internal metallic surfaces shall be coated with a water-dis- placing rust preventive.
a. A minimum of one impact test (three specimens) shall be conducted on a representative test bar on each heat of the material in the final heat treated condition. This heat qualifi- cation test may be performed prior to actual manufacturing, provided that the heat treatment is performed in actual pro- duction equipment. The results of the test shall conform to Table 2, except for bolting material which shall be tested in accordance with ASTM A320. Thermal stress relief treat- ments need not be included in the heat qualification test. b. Test coupons shall be cut from a separate or attached block, taken from the same heat and, where applicable, reduced by forging and given the same heat treatment as the product materials that they represent. c. The Charpy impact test temperature shall be no higher than the temperature specified. The actual test temperature shall be the minimum temperature stamped on the name plate. d. Bolting materials shall be in accordance with ASTM A320 L7 or ASTM A320 L7M.
API Spec 6H:1998 pdf download
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