L51721 Pressure Capacity of MSS SP-75 Fittings

Fittings specified to be in accordance with MSS SP-75 have been found by purchasers to have fitting yield strengths less than the matching specified pipe without the marking required in MSS SP-75 17.1c. As will be discussed, there are two strength requirements in MSS SP-79 Section 8 Tensile Properties. The report provides guidance for the evaluation of 'as-received' fittings. The types of fittings considered are elbows, tees, caps, and reducers that are covered in Manufacturers Standardization Society Standard Practice 75 (MSS SP-75), Specification for High Test Wrought Butt Welding Fittings, 1993 Edition.