B31.3 Questions - Somewhat Random
B31.3 Questions - Somewhat Random
(OP)
Working through my understanding of the code, so there's a few random questions here. Thanks in advance for your help. (I'm using B31.3-2012.)
Thanks again.
-Matt
- Do you bother to calculate Y when t < D/6, or do you just use Table 304.1.1?
- When solving for P using equation 3a or 3b, does that confirm that the pipe in question can withstand a 1.5x pressure test? (Assuming we're not working with extreme temperatures here.) If not, what are some examples, other than temperature effects, that would cause a pipe (and ONLY pipe) to not be able to withstand a 1.5x pressure test based on the MAOP calculated by equation 3a/3b?
- When solving equation 24 in 345.4.2b, for a pipe where the component design temperature is equal to the test temperature, does S = ST? (The question behind the question is, am I choosing the right values out of Table A-1?)
- To determine the yield stress of a given pipe, you simply substitute the Specified Minimum Yield Strength value from Table A-1 and solve for P, correct?
Thanks again.
-Matt





RE: B31.3 Questions - Somewhat Random
1) Like it says in 304.1.1., fot T/D<6 use the table, for the T/D >= 6 calculate it
2) Yes,
3) Yes
4) To determine the yield stress of the pipe look at the SMYS figure provided. I think you mean pressure at which SMYS arrives at -
I think the answer is YES
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: B31.3 Questions - Somewhat Random
Sorry for not responding earlier. Took a couple weeks off after setting up the pressure test for the pipe in question.
I did read the code! I didn't understand it fully, which is why I'm here. Work stress can sometimes mess with ya. <grin>
Thanks again.
RE: B31.3 Questions - Somewhat Random