this specification covers wrought carbon steel and alloy steel fittings of seamless andwelded construction covered by the latest revision of ASME B16.9 , B16.11 , MSS-SP-79 , MSS-SP—83 , MSS-SP-95 , and MSS-SP-97 . These fittings are for use in pressurepiping and in pressure vessel fabrication for service at moderate and elevatedtemperatures. Fittings differing from these ASME and MSS standards shall befurnished in according with Supplementary Requirement S58 of SpecificationA960/A960M.
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