RE: [MW:5714] stroge tank API 650

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

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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 http://www.wix.com/LuisAlbanes/Luis_Albanes www.youtube.com/Cuyanausul   --- 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 Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up now. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.   -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.   -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- Thanks  & Best Regards, Suresh Mobile No: 91-92 92 905 905 -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

 
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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