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sdpsd1987 2017-09-22 10:57

ASME中关于直管段两条焊缝距离的要求

请教论坛里的前辈:
我们很多国标中都对直管段上两条焊缝的间距做了规定,请问有没有熟悉ASME的前辈指导在美标中有没有对直管段两条环焊缝间距的要求。
谢谢

tt5449 2017-09-23 18:34
根据ASME  第八卷和B31.1的规定,焊缝的间距一般大于1倍筒体和管道的直径。

yamal 2017-09-24 21:29

Page No.492 of ASME B31.3-2016

ASME B31.3 INTERPRETATIONS

Interpretation 25-20

Question (6): Does ASME B31.3 provide any rules, restrictions, or limits for the distance between
circumferential butt welds in a piping assembly?

Reply (6): No.

liuhonghui 2017-09-25 09:27
好像在哪里见过,国内规范,至少大于一倍管径,或500mm,两者取大值,管子对接焊缝,纵缝宜错开一倍壁厚,或100mm,取大值,也经常听说ASME没有这项要求。

niat8888 2017-09-25 16:52
31.3  无要求

nterpretation: 7-02
Subject: ASME/ANSI B31.3-1987 Edition, Paras. 304.3.3 and 328; Spacing of Welds
Date Issued: May 24, 1988
File: B31-87-039
Question: In accordance with ASME/ANSI B31.3, are there requirements or guidelines on the minimum distance between welds in a pipe?
Reply: No, except as provided in para. 304.3.3(e).

Interpretation 25-20
Subject: B31.3-2012, Interpretation of Figs. 328.5.4D Acceptable Details for Branch Attachment Welds
Date Issued: September 25, 2014
File: 14-1470
Question 6: Does ASME B31.3 provide any rules or restrictions or limits for the distance between circumferential butt welds in a piping assembly?
Reply 6: No.

金龟换酒 2017-09-25 18:01
好贴,读标准还是要仔细。

liuhonghui 2017-09-26 14:08
核电连接反应堆压力容器、蒸汽发生器、主管道,泵壳的连接,都需要300mm长的’安全端过渡连接,方便返修。如果对焊缝数量作出要求,那么核电主设备安装就没法干了。


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