Asking about Misalignment Tolerance

Date 03-20-2009 07:42

Dear you all,

We are fabricating some piping for our client, the applicable code is ASME B31.3, when we do fit-up inspection then all of our inspector don't know what tolerance for Misalignment, could any body help me to answer how many mm that permited for Misalignment in ASME B31.3?

Thank you very much and looking forward to hearing from you soon.

By js55

Date 03-20-2009 13:40

You need to get a set of PFI standards. ES-3 is the applicable standard for your question.

By G.S.Crisi (****)

Date 03-20-2009 17:09

What does PFI mean?
Giovanni S. Crisi
Sao Paulo - Brazil

By js55

Date 03-20-2009 17:18

Pipe Fabrication Institute

By cong nguyen (**)

Date 03-22-2009 12:08

Thank in advanced Mr js55

By hogan

Date 03-20-2009 15:43

read the code

By welder5354 (**)

Date 03-20-2009 23:58

Go to K328.4.3 [B31.3 code]
and also look at Figure K328.4.3.
This will tell you alignment or misalignment.
If i tell you the answer, then you'll never learn!!

By Shane Feder (****)

Date 03-21-2009 02:43

Cong Nguyen,
If you are a Welding Engineer and CWI you should have a copy of the fabrication code you are working to.
Go to the index and look up misalignment and that will tell you what page, then you will have your answer.

Welder5354,
You have quoted Section K which is High Pressure Piping.

Regards,
Shane

By cong nguyen (**)

Date 03-22-2009 12:09

If our client clear difine in their specification then it is easyer for me, but in project specification do not mention for misalignment tolerance. Thank you any way!

By crazycajun (**)

Date 03-22-2009 02:44

well it depends on what the customer specs. the code can tell you the way it should be done but sometimes the customer specs are a little more tougher. so first the question i should ask is, how could you have more than a few inspectors and none of them that deal with b31.3. its like the other guys said get the code and look up misalignment and hi-lo. most people or more concerned with the internal hi-lo for the root pass, so they get a good root.

By cong nguyen (**)

Date 03-22-2009 12:07

Thank you all for your advices!