Pipe thk claculation for SS347 Pipe at 649 deg C
Pipe thk claculation for SS347 Pipe at 649 deg C
(OP)
Hi All,
We are designing a pipe for high temperature service and using the base material as SS 347 for a temperature 649 deg C / 300#. The pipes seamless pipes are as below,
A312 Gr.TP347 (Seamless)
A358 Gr.347 CL.1 (Welded)
For Pipe wall thickness calculation we have used the B31.3 Table A-1
- For welded points the allowable are taken considering heat treatment requirement above 538 deg. C.
- The Y factor taken as 0.7
- The Weld Joint factor as 0.77
But the thickness getting are much more than the existing pipe used. So is there any requirement I have to consider in high temperature pipe thk. calculation or heat treatment has any impact on allowable stress values of SS347 at high temperature.
We are designing a pipe for high temperature service and using the base material as SS 347 for a temperature 649 deg C / 300#. The pipes seamless pipes are as below,
A312 Gr.TP347 (Seamless)
A358 Gr.347 CL.1 (Welded)
For Pipe wall thickness calculation we have used the B31.3 Table A-1
- For welded points the allowable are taken considering heat treatment requirement above 538 deg. C.
- The Y factor taken as 0.7
- The Weld Joint factor as 0.77
But the thickness getting are much more than the existing pipe used. So is there any requirement I have to consider in high temperature pipe thk. calculation or heat treatment has any impact on allowable stress values of SS347 at high temperature.





RE: Pipe thk claculation for SS347 Pipe at 649 deg C
Also, above a 15 mm thick wall, there is a concern regarding "RC" relief cracking of 347H
"Whom the gods would destroy, they first make mad "
RE: Pipe thk claculation for SS347 Pipe at 649 deg C
RE: Pipe thk claculation for SS347 Pipe at 649 deg C
@ davefitz
Actually the existing pipe is used with A312 TP347 hence the calculaion is considering that material.
@ metengr
We are using the seamless pipe but for 24" and above (upto 42") the welded pipes are used.
RE: Pipe thk claculation for SS347 Pipe at 649 deg C
RE: Pipe thk claculation for SS347 Pipe at 649 deg C
You may like to use PetroPipe software to get you calculation verified.
It does the calculations for required thickness according to different piping codes including ASME B31.1, B31.3, B31.4 & B31.8.
It's a freeware.
Birken
RE: Pipe thk claculation for SS347 Pipe at 649 deg C
RE: Pipe thk claculation for SS347 Pipe at 649 deg C
So, if your plant/pipe life is less than say 20 yrs (200.000hrs), you might want to look into ASME III Div 1 sub NH. Not sure though if 347 as a amaterial is listed in there, to permit a higher WJSRF.