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RE: [MW:5714] stroge tank API 650

By Materials & Welding
API does state that the bottom should be as flat as possible. But practically, there might be several parameters to be looked after.
For plates less than 8mm, SAW cannot be deployed as the heat input by SAW itself is enough to leave the plates distorted.
Secondly, the sequence of welds should be adopted such that expansion in the plates, after welding, is compensated for. As an example, you can weld the seams radially outwards from the center. First complete all the short seams and then the long ones. Sketch to annular joint to be welded as the last step.
Adequate reinforcement of two plates being lapped also plays an important role in the overall flatness

have a happy, flat bottom

Regards,

Muhammad Ali

Date: Mon, 21 Jun 2010 11:49:18 -0700
From: ing_albanes@yahoo.com.mx
Subject: Re: [MW:5690] stroge tank API 650
To: materials-welding@googlegroups.com

We just had a lot of discussion in a project, API 650 only states that bottom should be "as flat as possible" this is not satisfactory for supervisors or owners...
 
 
Ing. Luis Albanés M.
 
El Salvador
cel 503 77387661
Skype: albanes61
fax 1 303 479 6738


--- El lun 21-jun-10, Suresh <bobsuresh24@gmail.com> escribió:

De: Suresh <bobsuresh24@gmail.com>
Asunto: Re: [MW:5685] stroge tank API 650
A: materials-welding@googlegroups.com
Fecha: lunes, 21 de junio de 2010, 9:59


Dear  Ramesh,
 
We have been faced same problem in our previous project.I agreed with you that API 650 does not stated clearly about bottom plates distortion.
 
In best my knowledge we need to minimize the distortion as much as we can during welding.I strongly recommended you to use low heat input and use good condition automatic welding machine.
 
Thanks
 
Suresh
 
QA/QC Specialist
On 6/21/10, Ramesh <ram2ram_2000@yahoo.com> wrote:
Dear all,
can any one explain storage tank bottom plate thermal distoration due to welding as per API 650 how we get the tolernce of expect peaking, banding,plumpness,and other.only bottom plate waveness tolerence not shown extally.

 
 
 
 

Thanks and Best Regards,

 Balakrishnan Ramesh

QA/QC Dept

QA/QC Inspector.Tanks/Silos

Daelim Saudi Arabia Co.Ltd

Value Creating Global Plant Builder

 SAUDI KAYAN HDPE PROJECT

8 ram2ram_2000@yahoo.com

      jayak@daelim.co.kr

 (KSA #-+966530647157

 

 
 
 
 


--- On Mon, 6/21/10, KASHKOUSHA <kashkousha1@yahoo.com> wrote:

From: KASHKOUSHA <kashkousha1@yahoo.com>
Subject: Re: [MW:5682] weld SA-106 to 9 Cr materials P No 5B gr 1 or gr 2
To: materials-welding@googlegroups.com
Date: Monday, June 21, 2010, 12:45 PM

dear ahmed
yes,by using ER 90S-B9(GTAW)&E9018-B9 (SMAW) or E 9015-B9
the joint should be heat treated acc .to ASME B31.3

 
H.KASHKOUSHA

 

From: Ahmed Hafez <diesel2002@hotmail.com>
To: Welding Material <materials-welding@googlegroups.com>
Sent: Mon, June 21, 2010 1:42:17 PM
Subject: [MW:5681] weld SA-106 to 9 Cr materials P No 5B gr 1 or gr 2

good morning every one
is it applicable to weld SA-106 to 9 Cr materials P No 5B gr 1 or gr 2
 
thanks and best regard

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Thanks  & Best Regards,

Suresh

Mobile No: 91-92 92 905 905
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