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post weld heat treatment A333

post weld heat treatment A333

post weld heat treatment A333

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

RE: post weld heat treatment A333

To answer your question, what Code or Piping Standard are you working under -  ASME B31.3 or B31.4 Process Piping Standard or other? Also, what is the pipe size/schedule?

Second question - are you sure about fillet welds or are these butt welds with external fillets applied like a branch connection or combination or are you welding attachments to existing piping? Please be specific.


RE: post weld heat treatment A333

Why are you using fillet welds on Propane duty? Butt welds are a much safer proposition.

RE: post weld heat treatment A333

(OP)
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.

RE: post weld heat treatment A333

No PWHT. I checked B31.3, Table 331.1.1, for 3/4" wall thickness and less for P-No 1 base material, no PWHT.

RE: post weld heat treatment A333

(OP)
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.

RE: post weld heat treatment A333

No. ASTM A 333 Grade 6 is basically a medium carbon steel with 0.2-0.3% Mo. This is a weldable grade of steel, considering Section IX treats it like a P-No1, Group - No1 material. For your application, this material should pose no problems without PWHT.

RE: post weld heat treatment A333

Paulbrown,
          metengr answers your question explicitly. It's what I advised Reg anyway!!!

RE: post weld heat treatment A333

(OP)
Thanks Metengr.

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

RE: post weld heat treatment A333

Paulbrown,
As metengr has stated, B31.3 does not require PWHT for the low temperature service. Furthermiore, it is not common practice to PWHT with the design described; however, service conditions, as determined by the designer, may dictate otherwise.  "In such cases, the designer may specify more stringent requirements in the engineering design, including heat treatment.." (ref. 331.2.2)   

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