Re: [MW:5087] Weld proximity in pressure vessels

There are no codes (except for one in Australia or New Zealand I heard about) that state any "mandatory" limitations. There is only good construction practice, usually some companies will state welds must be 1-1/2  times the OD of the pipe apart etc., some may state twice the diameter.   But there are no code stipulations. These are only good construction practice.

 

If you are stuck, you can weld side by side, this of course is not favorable. Bottom line is if the weld has to be close, you can do it.

 

Hope this helps, Bob

----- Original Message -----

From: Ramani, Vaidyanathan (Kuwait)

To: materials-welding@googlegroups.com

Sent: Thursday, May 06, 2010 12:45 AM

Subject: [MW:5081] Weld proximity in pressure vessels

Dear All,

Can you please confirm if there are any mandatory limitations on weld to weld distance (nozzle to CS/ LS, welds of attachments to other welds etc.)

Details:

1. Governing code: ASME Sec VIII Dev 1
2. PWHT – Applicable
3. NDT: 100% RT & MPI on attachment/ fillet welds
4. Service – Sour

 

Does a weld meeting all above criteria (2 to 4) have an issue, metallurgically, when welds are too close or don't have even spacing e.g. reinforcement pad to demister support ring etc.

 

With Regards,

V.Vaidyanathan

 

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