RE: [MW:27362] Cromium limit to maintain back purging

This practice is considered to be a good engineering practices. BPV codes can't mandate all , many of such things has to come from the fabricators' sound engineering judgement and adopted practices.

 

Please see below the extract from API-RP-582, on the requirements of back purging.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

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7.3 Back purging is required for the GTAW and GMAW processes for welding materials having a nominal chromium content greater than 2-1/4 %, unless the joint is ground or back gouged to sound metal.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pradip kumar Sil
Sent: February 21, 2018 3:09 PM
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:27361] Cromium limit to maintain back purging

 

Dear everybody,

Can anybody pls give me any code reference regarding this issue. I searched B31.1 , B31.3,  ASME but i did not find  minium chrimium percentage written on the code.

 

Is code silence regarding this issue.

 

Waiting for your valuable reply.

 

thanks in advance

 

regards

pradip

 

On 20 Feb 2018 12:19 pm, "Kannayeram Gnanapandithan" <kgpandithan@gmail.com> wrote:

ref B31.1 or B31.3, and lot of books 

 

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On Tue, Feb 20, 2018 at 12:39 PM, pradip kumar Sil <pradipsil@gmail.com> wrote:

Dear Sir,

Can you pls provide me code references.

Thanks in advance

Pradip

 

On 20 Feb 2018 8:53 am, "Kannayeram Gnanapandithan" <kgpandithan@gmail.com> wrote:

Grater than 3% Cr, purging

 

On 20-Feb-2018 9:51 am, "pradip kumar Sil" <pradipsil@gmail.com> wrote:

Dear everybody,

Can anybody inform me minimum how much percentage of cromium limit to maintain back purging with code reference.

Thanks in advance

Pradip

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