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Thanks Metengr. DSB123 - We don't usually get to know whether questions have been asked or answers given !!!

metengr. I know B31.3 says no PWHT for P 1 materials but, do environmental conditions change the requirement for PWHT even though is not mandatory.

We are working to B31.3, pipe is 3/4" sch. 80 and the reason we are using socket weld fittings is because that is the existing site standard.

Do you need to PWHT fillet welds in A333 gr6 pipe for propane duty down to -43degC (-45degF)? As material has P No.1 pipe does not need PWHT unless thicker than 19mm (3/4") according to B31.3, but I think this might be a bit simplistic due to the low temperature?

Do you need to PWHT fillet welds in A333 gr6 pipe for propane duty down to -43degC ?

bvi On a lot of plant's you are not allowed to seal weld threaded joints, so the threads are cut off after Hyd. test & a socketweld fitting is used. We do not use API570 but I will have to check it out Regards Paul

Thank's dsb123 The reason I asked this is that quite often vents for Hyd. press. testing are fillet welded after testing is finished and I wondered whether this logic could be used for other low stress branches.

H.P. Steam 90bar 490C (1300psi 914F) When we have to repair pipework during shutdown if we cannot Hyd. Press. test the pipework we 100% Radiograph all Final butt welds (butt welds are the only weld we allow as final welds even down to sizes we would normally use Socket weld fittings on). While...

Thanks for the advice. I have noticed that the pump stuffing box is already linked to the pump inlet Regards Paul

We have positive displacement pumps which use mechanical seals which are designed for a Max. Inlet pressure of 3.5bar. It has been noticed that although we can maintain the 3.5bar during normal running conditions, the thermal relief valves on the inlet piping are set at 5.5bar Does this mean...