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发表于 2016-5-23 14:58:44
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两个公式是一样的:把3a中的外径D换为d+2t+2c就可以得到3b;加c的原因进解释21-13
Interpretation: 21-13
Subject: ASME B31.3-2oo4, Paras. 304.1.2, Design of Straight Pipe Under Internal Pressure and 304.2.1, Pipe Bends
Date Issued: September 20,2006
File: 06-1091
Question (1): ASME B31.3-2004, para. 304.1.2 provides two equations to calculate pressure design thickness for straight pipe, eq. (3a) and eq. (3b), the former using the outside diameter and the latter using the inside diameter. Do these two equations yield the same results?
Reply (1): Yes, when the corrosion allowance in para. 304.1.1 is applied to the inside diameter of the pipe.
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