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.
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
RE: Piping ovality after welding
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
RE: Piping ovality after welding
@ 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
"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
I guess a slightly higher ovalization limit, given the low design pressure, can still be accepted.
RE: Piping ovality after welding
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek