SA691

This sa691 (for ASME boiler and pressure vessel codes, see Volume II of the relevant specification SA-691) covers high temperature and high pressure electrofusion welded carbon steel and alloy steel pipes. Heat treatment may not be required in order to achieve the desired mechanical properties or in accordance with applicable specification requirements. The supplemental requirements provided are used when some additional testing and inspection is required.

This sa691 nominally covers an outer diameter of 16 inches (405 mm) and a maximum wall thickness of 3 inches (75 mm). Pipes of other sizes may also be provided provided that it is consistent with other requirements of this specification.