Wednesday, February 21, 2018

RE: [MW:27363] Chromium limit to maintain back purging

API 582 Section 7.3 specified that "Back purging is required ……….. for a nominal chromium content greater than 2 ¼% ……."

 

 

Feng Lu, Ph.D., NDE Level III
Metallurgy and Welding Engineer

Zachry Industrial, Inc.
3600 West Sam Houston Pkwy South

Suite 200

Houston, TX 77042

luf@zachrygroup.com
Office: 713.979.2648
Cell: 512 797 5777
www.ZachryGroup.com

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of PGoswami
Sent: Wednesday, February 21, 2018 7:04 AM
To: materials-welding@googlegroups.com
Subject: 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

Linkedin: https://secure-web.cisco.com/1O4oLmpbUXp9Pyre9Qhqe1-sgFOkQg-b28jLfwQLaI9jtjE-SUzK8Du-3iwQ1tPgc3R7r_Rj7vc6X7YZ1rFbxwQfOuzvTKmGIqFBv8VLcexUdmtcyUO8SJKfVuj6mLUNZvt33r-_0q5jSc35ehC99Eqo62T_ZUL2GafUciEhmvMBfMZy4J6EYMsTYdxmelktc5UmGyTNvbBd-VsZ3Q6F2ZcqnLN7AAQUMyn2VRgpPUirKBx9Li9C_jHVRzrVaIGK8utzyHuKxVFfRJz6KU5pl7fKknjwxTtwP5jZHbqTvcVkUnpnLopInUQXDRAhVD4J7/https%3A%2F%2Fwww.linkedin.com%2Fin%2Fpradip-goswami-2999855%2F

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

M(in India-Till 26 Feb, 2018)- 8336816470

 

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 


THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

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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[MW:35346] Cast-iron welding

Any advice for cast iron welding Sent from Yahoo Mail for iPhone

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