Thick wall pipeline stress calculation
Thick wall pipeline stress calculation
(OP)
Hi
I'm using ASME B31.4 to design a pipeline with following specifications:
Design Pressure: 8360 Psi - Pipe size: 6" - Temp: 120 C - material: API 5L X60
the calculated thickness with ASME b31.4 is 22.23 mm and the d/t ratio will be 7.5.
It's mentioned in B31.4 that the stress formula from internal pressure is not applicable for d/t<20.
Now i'm asking what formula or standard i can refer to for stress calculations? is it ok to calculate thickness with B31.4 and stress calculations from another source?
I'm using ASME B31.4 to design a pipeline with following specifications:
Design Pressure: 8360 Psi - Pipe size: 6" - Temp: 120 C - material: API 5L X60
the calculated thickness with ASME b31.4 is 22.23 mm and the d/t ratio will be 7.5.
It's mentioned in B31.4 that the stress formula from internal pressure is not applicable for d/t<20.
Now i'm asking what formula or standard i can refer to for stress calculations? is it ok to calculate thickness with B31.4 and stress calculations from another source?





RE: Thick wall pipeline stress calculation
The only pipeline code I know which actually gives you a different formula for thicker pipe is BS PD 8010-1. section 6.4.2.1
see upload for extract
ISO 13623 uses the mid wall thickness (section 6.4.1.1)
The issue is probably that the thickness you get will be lower, so which do you choose?
At that pressure you might be better off using API 6A as you'll need to use API 6A flanges.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Thick wall pipeline stress calculation
you mean if i use ISO 13623 the calculated thickness will be lower than what i get from BS 8010? if yes that might be good for me because the thickness i calculated with B31.4 is already high.
can u please specify in which section of API 6A it talks about pipe design and thickness calculation?
also i was wondering if i could use ASME sec viii div 2 for stress calculations of thick wall pipes. is it possible?
RE: Thick wall pipeline stress calculation
Basically find a flange to suit which then list max bore and that's your wall thickness based on X 60.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Thick wall pipeline stress calculation