Dear Mr. Das,
First of all, my appologies for refering a wrong para of API1104. Read 6.1 for 621.
I don't think it mandatory to have 2 welders on pipes above 12", I couldn't find any thing to support this requirement in API 1104. Whereas in Section IX it is allowed to qualify more than one welder on a single test coupon. Refer QW-306.
It is not mandatory to use two welders in pipes larger than 12" in Section IX also.
Regards,
Dr. Paulose John
QA/QC Manager
Unisis Engineering
KSA
On Sun, 31 Oct 2010 08:08:06 +0530 Arun Das
>
Dear Dr.John,
As a custom for above 12" pipe we will be using 2 welders for the welding process. It is so done because of heat input and distribution factors I beleive, but my question was that do this is stated as mandatory in any of the codes or standards.
I am having 1104 20 th edition of November 2005 with me. API 1104:2007. is the modifications??
Thanks and regards,
>
>
Arun S Das
>
>
From: Dr. Paulose John <drpaulosejohn@rediffmail.com>
>To: materials-welding <materials-welding@googlegroups.com>
>Sent: Sat, 30 October, 2010 4:07:56 PM
>Subject: Re: Re: [MW:7943] No of Welders
>
> Dear Mr. Arun,
>
>Minimum number of welders to be qualified by one WPS is - One welder. The welder who performs the PQR coupen welding is automatically becomes qualified. Please refer 2nd para of QW 301.2 of Section IX:2010 and para 621 of API 1104:2007.
>
>Regards,
>Dr. Paulose John
>QA/QC Manager,
>Unisis Engineering,
>Saudi Arabia
>.
>On Sat, 30 Oct 2010 14:15:07 , No ID Specified wrote
>
| To my knowledge there is no limit for number of welder qualificationupon one WPS, You can qualify as many as per to the requirement for your project. Here By, P.BalajiRajan, -------Original Message------- Sir, Minimum number of welders to be qualified upon one WPS is mentioned in SEC 1X or API 1104. We are using PIPE,16"X0.375"WT STD SCH API 5L X52 Thanksinadvance with regards, > Arun S Das > |
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