[MW:21760] Re: Post Weld Heat Treatment Query with respect to ASME Code

Hi,

According to UW40 (f) 5).. you are correct. (When a weld joint connects the parts of un equal thicknesses, nominal thickness shall be the the thinner of the adjacent butt weld parts. In your case if the shell thickness in the thinner one then you can use this thickness as a nominal thickness for PWHT calculations.

Thanks & Regards,

(Karthik)

Karthikeyan.S

QA/QC Manager

German-Thai Boiler Engineering Cooperation Limited.

Rayong Factory ;

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Nikompattana, Rayong 21180 THAILAND

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On Saturday, August 30, 2014 2:25 PM, hask engineering <haskengineering@gmail.com> wrote:

Dear Sir,

 

Please clarify that as per ASME section VIII division 1, what thickness    must be taken for PWHT soaking time calculation. As per UW-40 f(5)- in head to shell joint, lesser thikness must be considered. But in our job,(P1 material ) our client inspector is saying to take the nominal thickness of head. Please give your suggestion.

 

Regards,

 

Kashif

 

 

On Saturday, March 3, 2012 12:34:39 PM UTC+3, Vino wrote:

Dear Sirs,

 

I AM ALWAYS GETTING A POST DELIVERY FAILURE NOTE STATING THAT THE MESSAGE IS NOT DELIVERED. CAN ANYONE HELP ME OUT OF THIS.....

 

This is the very reason I am writing direct mail, sincere apology for same. Query below -

 

The PWHT Temp range is different in ASME B31.3(Table 331.1.1) and ASME Sec VIII Div 1(Table UCS 56), but both are from ASME. The welding and welder qualification are as per ASME Sec IX, for both B31.3 and Sec VIII, Div 1.

 

Why ASME Committee put such a different requirement although both are published from ASME and material grouping is also the same, means the metallurgical properties should be same, i assume.

What should be the criteria of PWHT for PQR run on a Pressure Vessel? If I have qualified a PQR using ASME B31.3 taking account of B 31.3 PWHT Criteria, is it acceptable to have the same PQR on Pressure Vessel (Designed as per ASME Sec VIII, Div 1).

 

Looking forward for a technical clarification.

 

Thanks & Regards

Vino-Doha