When originally published forged piping components to A 105 were required to be heat treated. Some time prior to the 105/A 105M-85b revision heat treatment was only required for certain listed piping compo nets. Currently the standard includes the statement 5.1 Heat treatment is not a mandatory requirement of this specification except for the following piping components ..... The term piping component is not defined, however the scope clause seeks to exclude use of the specification for pressure vessel shells and tube sheets. Although the standard has provisions for test specimen location when forgings are required to be heat treated, for as forged items the only requirement is that one tension test is required for each heat, and the test location for that is not described. Apparently in some quarters the standard has been used to purchase forged vessel shells and thick section tube sheets in the as forged condition, despite the risk of poor notch toughness properties. Recently inquiries have been made concerning making vessel shell and tube sheet forgings to A-105, probably with the idea that heat treatment would not be required. Revising the standard to make heat treatment mandatory should not be a hardship, since a parallel standard, A 181 for carbon steel piping components, does not require heat treatment.
Keywordspipe fittings, steel; piping applications; pressure containing parts; steel flanges; steel forgings, carbon; steel valves; temperature service applications, elevated; temperature service applications, high;
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