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Piping ovality after welding

Piping ovality after welding

Piping ovality after welding

(OP)
All,

After welding a 2" SS316 weldolet, 40S, on a 10" SS316 pipe, it was noticed the pipe warped/got oval due to high heat input (probably the welder didnt let the weldolet cool down prior to making a new bead).
I was wondering what one may accept as an ovality limit. The pipe is ASTM A312; A312 refers to ASTM A999 for ovality limits.
The inward shrinkage around the weldolet is approx half an inch, maybe alittle more. Given ASTM A999 table 1, this may not be acceptable.
Should A999 be used also for 'after-welding' pipe OD variations, or should it be seen strictly to the 'as-delivered' pipe dimensions (i.e. prior towelding)?
The line design is atmospheric, 400 C.

RE: Piping ovality after welding

A-999 applies to the pipe as supplied by the manufacturer - not to pipe that is subsequently welded on by a pipe spool fabricator or a contractor, etc. Design/construction Codes and Engineering specifications/drawings apply to the condition identified.

RE: Piping ovality after welding

For pipeline work, as much as 5% ovalization can be tolerated.
Your contract & specs do not mention any ovalization limit?

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: Piping ovality after welding

How thick is the 10" pipe? Did your welder fill the weldolet bevel completely?

RE: Piping ovality after welding

(OP)
@ stanweld; just as I suspected
@ BigInch; no, there's ovalisation limit specified in client specs. Where does the 5% limit comes from? Or is it just sound engineerign practice?
@ austsa; it's a 10" 10S pipe. Welder filled the weldolet completely. Given the design pressure (49 kPa), that may not have been necessary (but also not prohibited).

RE: Piping ovality after welding

Just a common fab and installation limit, mostly deriving from the practicalities of a great need to a lot of cold bending.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: Piping ovality after welding

(OP)
Would that 5% be defined as [Dmax - Dmin] / Dnom ??

I guess a slightly higher ovalization limit, given the low design pressure, can still be accepted.

RE: Piping ovality after welding

Don't remember. (ODmax - ODmin)/ODmax ?

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

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