tolerance on diameter 1

[B.Beykaee]

hello every body
where on b31.3 is about tolerance of diameter(oval) after welding plate for fabricate a pipe?

 

[LittleInch]

Almost certainly it's within the pipe specification.

B31.3 is a code for putting things together and has a big list of other specifications that it uses.

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

 

[MJCronin]

I agree with LittleInch....

Somehow, in the third world, the opinion is that ASME B31.1 and B31.3 are the ONLY sets of rules that you need on your shelves and that they will answer all piping system questions..... NOT TRUE ...

I don't know how many eng-tips questions I have seen posted on these fora that state " Show me where it says in B31.3 I can't do XXX"

That is not how these standards work .... Read the Introduction and Scope

It is more useful to think of B31.1 and B31.3 as a gateway to other piping and mechanical related codes and standards.

Here is one ASTM standard (of many) that covers the rules for fabricating plate into pressure piping.

https://www.astm.org/Standards/A671.htm

MJCronin
Sr. Process Engineer

 

[M.CH]

Hi,
It shall be consider that diameter tolerance and ovality are different subjects. In some case ovality may be accepted but diameter is out of range. So Refer to meaning of ovality.
Best Regards,