P8 themocouple to attach to B31.3 P5B heater pipe
P8 themocouple to attach to B31.3 P5B heater pipe
(OP)
Hi all,
Please advise on the following. for all reference this is in accordance with B31.3 2012
I have a furnace tube of material specification P5B
The user needs to attach a thermocouple via fillet weld of 3mm to the outside of the tube of which the material is a P8 stainless steel.
The table 331.1.1 says that all weld sizes are mandatory under P5B material specification but in paragraph 331.1.3 (2) says that for P-No 3,4,5 & 10A when weld throat thickness is less than 13mm PWHT is not mandatory as long as the minimum preheat is applied. Please advise if i am reading this correctly and if it applies to P5B material.
Kind regards
Ruben Naidoo
Senior Inspector of Pressure Equipment
SAPREF Refinery SA (SHELL & BP)
Please advise on the following. for all reference this is in accordance with B31.3 2012
I have a furnace tube of material specification P5B
The user needs to attach a thermocouple via fillet weld of 3mm to the outside of the tube of which the material is a P8 stainless steel.
The table 331.1.1 says that all weld sizes are mandatory under P5B material specification but in paragraph 331.1.3 (2) says that for P-No 3,4,5 & 10A when weld throat thickness is less than 13mm PWHT is not mandatory as long as the minimum preheat is applied. Please advise if i am reading this correctly and if it applies to P5B material.
Kind regards
Ruben Naidoo
Senior Inspector of Pressure Equipment
SAPREF Refinery SA (SHELL & BP)





RE: P8 themocouple to attach to B31.3 P5B heater pipe
Regards
jey