New stringent dimensional specifications → 3.17(2) Description of high-neck flanges.

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This post was last edited by ningyong58 on 2011-8-23 at 11:19. 3.17 Pipe flanges for pressure vessels (1) The design of steel pressure vessel pipe flanges, gaskets, and fasteners should comply with the provisions of the industry standards HG 20592–20635-2009, the series of standards for \"Steel pipe flanges, gaskets, and fasteners\"； (2) For pressure vessels containing liquefied petroleum gas, media with extremely high or high toxicity, as well as highly permeable media with moderate toxicity, their pipe flanges shall, in accordance with the provisions of the industry standards HG 20592–HG 20635 series, use at least a high-neck butt weld flange, a metal wound gasket with reinforcing rings, and specially graded high-strength bolts. In HG20592, the WN designation refers to a flange with a neck; the term \"high-neck welded flange\" was used before the 1990s. Is the new capacity specification, following HG20592, referred to using the term high-neck butt weld flange? ? ? ? ? ? ? ? ? ? ? ? ? ? ? This post is purely nitpicking; I hope those who develop the standards can standardize the nouns.