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Temperature Derating Factor

Temperature Derating Factor

Temperature Derating Factor

(OP)
Good evening,

For thickness calculation
What does this factor accounts for? and why is it only used in ASME B31.8 but not ASME B31.3 & B31.4 ?

Your accurate response is highly appreciated.

RE: Temperature Derating Factor

ASME 31.4 has an upper limit of 250F (section 400.1.2) which is where the temp-rating factor of 31.8 starts to apply.

31.3 has defined values (table A1) for S to be used as allowable stress for many different materials versus temperatures.

These are basic questions - Is this a student posting? Please identify your experience and what you're asking very simple basic questions

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Temperature Derating Factor

B31.3 has additional weld reduction factors at temperatures for high temp use.

RE: Temperature Derating Factor

(OP)
LittleInch,

Yes i'm a student, but currently doing my COOP in a design company

RE: Temperature Derating Factor

You could do a lot worse than actually read the codes you're being asked to use. You'll probably not have a good chance ever again, but you'll then figure out and remember how each one works and not nerd to go around asking basic questions again....

They're not a riveting read, but essential to making progress.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Temperature Derating Factor

(OP)
However, it is neither wrong nor a shame to ask questions even the simple and basic ones as you have described. We learn everyday and engineering is a an ocean of knowledge, and to accurately acquire it i think it's rational to ask "basic/hard question" to the experts and take from their experience and knowledge. The more the questions the deeper the understanding a person can get.

Thank you.

RE: Temperature Derating Factor

AdilJassemm,

I have no issues with you asking questions, that's why I respond. However for this and for the future, it is much better for you and your superiors / forum members if you have a look at the relevant codes etc first and then either say "I've looked at XYZ" and I'm not clear / can you confirm", is much better than "please tell me".

Ok, I knew where to look to give you the answer, but it wasn't hard and you could have found this out by a small amount of looking at the codes in question.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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