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Where was this picture taken from?

2015-09-30View Original

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http://bbs.hcbbs.com/thread-1092823-1-1.html I compared the 1997 and 2009 versions of 20592, and they are not exactly identical. I would appreciate it if someone knowledgeable could tell me where this screenshot might have come from. O(∩_∩)O Thank you
Reply #22015-09-30
Is it in ASME B16.5?
Reply #32015-09-30
HG/T 20615-2009 Steel pipe flanges, Class series
Reply #42015-09-30
Found it, O(∩_∩)O Thanks
Reply #52015-09-30
I rarely use this standard. I saw it last year and collected it. :$
Reply #62015-09-30
I know too little about the piping systems I’m working with. . .
Reply #72015-09-30
Of course, just do one’s own job! :handshake

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