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TOPIC: cut an elbow

chanock ...That's 3 inches, NOT 11 years 10 months ago #4415

  • 11echo
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chanock ...That's 3 inches, NOT 3 degrees. “BUT IF” you did trim a fitting where the attachment welds were LESS then 3 inches, you could do a post heat treat on it. This would normalize the steel in that area, thus elimination the potential of being brittle in that area because of overlapping heat affected zones.
You COULD go down to 2.865 degrees and STILL maintain that 3 inch min. between welds. At that angle I think I might look at just getting a pre-fabed pipe bend, and eliminate all the hassle. My $0.02 anyway, Good Luck!

echo11, i'm sorry but I have 11 years 10 months ago #4416

  • chanock
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echo11,

i'm sorry but I have a serious problem with the distance between Welds of 2" now i need a technically justify for the client approve the work.

i need a code, asme , api or other...

please help me friend...


see attached please

Jop ...I'd "guess" you wouldn't 11 years 10 months ago #4417

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Jop ...I'd "guess" you wouldn't be able to use a one weld miter here. This is a 3R elbow, I'm guessing pigging here. Not sure a pig could make it thru a one weld miter, unless it's a "poly-pig"?

From the 3D bend, I 11 years 10 months ago #4418

  • gpsvn
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From the 3D bend, I guess this is a pigable pipeline, therefore the standard could be ASME B31.4 or B31.8.

Should a 3 degree cold bent be considered for this application ?

the code is B31.8. because, 11 years 10 months ago #4419

  • chanock
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the code is B31.8. because, the conditions of design are:

pressure:25600 psi
temperature: 140 f
service: nitrogen gas

can you think if is posible run the gauging plate (95% ID)?

Chanock, It would have been nice 11 years 10 months ago #4420

  • Jop
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Chanock,
It would have been nice to have had this latest information at the start.

The code: B31.8
Pressure:25600 psi
Temperature: 140 f
Service: nitrogen gas


It would have prevented me (and maybe others) from giving wrong answers.
Do it once and Do it Right
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