ASME B31.3 Section 323.2.2 (d) (1) (a)
ASME B31.3 Section 323.2.2 (d) (1) (a)
(OP)
Hello all,
I have a question regarding installation of non-impact tested materials at low temperatures. I have an A106B line that was installed incorrectly (should have been A333 gr 6). The line is low stress (<0.3 stress ratio), and so the minimum line temperature can be lowered in Curve B of Fig 323.2.2A. The minimum temperature for the line is -46C. This appears to meet all the requirements of B31.3 323.2.2, except for 323.2.2(d)(1)(a) - the line was originally pneumatically tested at 1.1x the design pressure, per code. However, 323.2.2(d)(1)(a) shows that the piping must be hydrostatically tested at 1.5x design pressure.
Since B31.3 states that regular hydrotesting occurs at 1.5x MAWP and regular pneumatic testing of lines occurs at 1.1x MAWP, is it inferred in 323.2.2(d)(1)(a) could have 1.1x design pressure pneumatic test substituted for the 1.5x hydrotest specified there? I do not think this is a safe thing to assume, but wanted to double check.
Thanks.
I have a question regarding installation of non-impact tested materials at low temperatures. I have an A106B line that was installed incorrectly (should have been A333 gr 6). The line is low stress (<0.3 stress ratio), and so the minimum line temperature can be lowered in Curve B of Fig 323.2.2A. The minimum temperature for the line is -46C. This appears to meet all the requirements of B31.3 323.2.2, except for 323.2.2(d)(1)(a) - the line was originally pneumatically tested at 1.1x the design pressure, per code. However, 323.2.2(d)(1)(a) shows that the piping must be hydrostatically tested at 1.5x design pressure.
Since B31.3 states that regular hydrotesting occurs at 1.5x MAWP and regular pneumatic testing of lines occurs at 1.1x MAWP, is it inferred in 323.2.2(d)(1)(a) could have 1.1x design pressure pneumatic test substituted for the 1.5x hydrotest specified there? I do not think this is a safe thing to assume, but wanted to double check.
Thanks.





RE: ASME B31.3 Section 323.2.2 (d) (1) (a)
Read up on the B31.3 code paragraphs specifying when testing is required and what all the alternatives are.
Learn from the mistakes of others. You don't have time to make them all yourself.
RE: ASME B31.3 Section 323.2.2 (d) (1) (a)
Hope this helps
Interpretation: 19-47
Subject: ASME B31.3-2002, Para. 323.2.2, Lower Temperature Limits
Date Issued: October 9, 2003
File: B31-o3-01347
ASME 831.3·2004
Question (1): In accordance with ASME B31.3-2002, when using a reduced stress ratio per Fig.
323.2.2B to permit use of non-impact tested materials per para. 323.2.2(d), can the hydrostatic
test required by para. 323.2.2(d)(1)(a) be substituted with the pneumatic test as permitted by
para. 345.1(b)?
Reply (1): No.
Regards,
DD
RE: ASME B31.3 Section 323.2.2 (d) (1) (a)
Thanks DD.
RE: ASME B31.3 Section 323.2.2 (d) (1) (a)
RE: ASME B31.3 Section 323.2.2 (d) (1) (a)
RE: ASME B31.3 Section 323.2.2 (d) (1) (a)
RE: ASME B31.3 Section 323.2.2 (d) (1) (a)