Post Weld Heat Treatment Query with respect to ASME Code

[Vino Varghese]

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

 

[S.Sundar Rajan]

 Dear Mr.Varghese,

Even though Section 8 and B31.3 is published by ASME, the motto of both the code is different based upon the application. As we aware that, B31.3 covers the process piping and section 8 covers the pressure vessels. Both the code is varying in all the means such as design criteria, acceptance criteria, fabrication procedure etc., We can not correlate both the codes as their application is unique.

And when it comes for PQR you asked about, the procedure qualified in pipe can be used in plate or vice versa if all the essential variables listed in ASME section 9 for that particular process matches. But you give attention that essential variables (Such as P-number, F-number, PWHT range etc.) should be correlated. It is given in QW-211 of ASME section 9.

With Regards,

S.Sundarrajan,

QA/QC Inspector,

Special technical services LLC, Muscat,

M: +96898217243.

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From: Vino Varghese <vinopv...@gmail.com>
To: gerr...@yahoo.com; pgoswami <pgos...@quickclic.net>; pgos...@sympatico.ca; karth...@yahoo.com; material...@googlegroups.com
Sent: Saturday, 3 March 2012 1:34 PM
Subject: [MW:13811] Post Weld Heat Treatment Query with respect to ASME Code

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[Karthik]

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 ;

379 Moo.6 Soi 8, Tambol Pananikom,

Nikompattana, Rayong 21180 THAILAND

Tel : +66 38 897 035-9 Ext. 137

Fax : +66 38 897 034

Hand Phone: 0066 892512282

On Saturday, August 30, 2014 2:25 PM, hask engineering <haskeng...@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

[Biplab Pal]

Dear Vino,

I think the difference is there because of the practical experiences of heat radiation during PWHT process for both cases Process Piping & Pressure Vessels.

Please clarify me if i am wrong.

With Best regards

Biplab Pal

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   bipla...@gmail.com
 
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