Which standard must all pipe fittings comply with?

All pipe fittings used in systems dealing with compressed natural gas must comply with specific standards to ensure safety, reliability, and performance. The standards mentioned—ASTM A-536, ASTM A-395, and ASTM A-47—cover various aspects of materials and manufacturing processes suitable for pipe fittings.

ASTM A-536 is a specification for ductile iron castings, which may be used in fitting applications requiring good durability and resistance to wear. ASTM A-395 outlines the requirements for gray iron pressure fittings, focusing on ensuring that these fittings can withstand the necessary pressure ratings for gas service. ASTM A-47 pertains to the specifications for malleable iron fittings, which also play a role in certain applications involving gas transport.

By stating that all pipe fittings must comply with these standards, the certification ensures that each type of fitting is appropriate for safely managing the pressures and conditions that may be encountered in natural gas transport systems. Compliance with multiple relevant standards supports the versatility and reliability of the fittings in various applications associated with compressed natural gas. Therefore, it is important that all the mentioned standards are acknowledged as part of a comprehensive safety and performance framework.