Temperature Derating Factor

[AdilJassem]

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.

 

[LittleInch]

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.

 

[weldstan]

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

 

[AdilJassem]

LittleInch,

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

 

[LittleInch]

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.

 

[AdilJassem]

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.

 

[LittleInch]

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.