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Hi Vishwas,
PWHT cycle ,T& T, rate of heating /rate of cooling should be as per the piping design codes, e.g B-31.1 or 31.3 or others as specified in the drawings or specifications.
AWS D-10.10 should be followed also as a guiding document for setting up equipments, e.g, heating pads, thermocouples,.....to facilitate the PWHT. In fact you need to to look at D-10.10 for detailed guidelines, assuming these pipes would not be heat treated in in furnace.
Thanks
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineer/Specialist
Ontario, Canada
On Tuesday, May 26, 2015 at 10:19:30 AM UTC+5:30, Vishwas Keskar Welding Manager Pune India wrote:
For long piping(Carbon steel, alloy steel), butt welding of large diameter(219mm OD TO 606mm OD, THK - 18.26mm to 42 mm )pipes is carried out.For PWHT of these butt welds, what are the parameters shall be considered for effective PWHT?
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