[MW:1888] RE: 1887] Re: 1878] Fillet welding of shell to bottom joint of API 650 Tanks

Hi,

Gap between the shell plate and bottom plate will cause severe distortion resulting in crack.

i)As such gap up to 0-2mm do not cause any problem of crack. Ii) Now to reduce the gap one of the edges to be chamfered by grinding and butter on the edge by welding, By this method reduce the gap. Iii) Tack weld by higher  dia. Electrodes with sufficient  length  and numbers iv) While fillet welding  use higher dia say 4/5mm electrode (If welding by SMAW) this will give higher thickness weld, which will give sufficient strength and use sequential welding. iv) Preheating and post heating is essential to avoid  crack and distortion v) If possible preferably  fillet welding to be carried both side  of the joint simultaneously so that there will be less distortion.

 

Hope this will solve the problem

 

Warm regards

 

Hegde P.B.

+9114714803

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of hamza ahmed
Sent: Tuesday, April 07, 2009 3:49 PM
To: materials-welding@googlegroups.com
Subject: [MW:1887] Re: 1878] Fillet welding of shell to bottom joint of API 650 Tanks

 

Hi,   As I wrote in previous mail, due to fabrication and erection mistake, the gap between first course of shell plate and bottom plate is upto 10 mm at some places. In case there is no reference in API 650(Applicable code), what would be the corrective action. Any advise.   Warm Regards Ahmed Husain ABS-TPI Borouge2 --- On Mon, 4/6/09, SAUL VASQUEZ T. <svasquez@ingetanques.com> wrote: From: SAUL VASQUEZ T. <svasquez@ingetanques.com> Subject: [MW:1884] RE: 1878] Fillet welding of shell to bottom joint of API 650 Tanks To: materials-welding@googlegroups.com Date: Monday, April 6, 2009, 6:42 PM The gap is not relevant to this joint we work without gap and maximum gap 2-3 mm. where you can not close.     5.1.5.7 Shell-to-Bottom Fillet Welds a. For bottom and annular plates with a nominal thickness 13 mm (1/2 in.), and less, the attachment between the bottom edge of the lowest course shell plate and the bottom plate shall be a continuous fillet weld laid on each side of the shell plate. The size of each weld shall not be more than 13 mm (1/2 in.) and shall not be less than the nominal thickness of the thinner of the two plates joined (that is, the shell plate or the bottom plate immediately under the shell) or less than the following values:         De: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] En nombre de hamza ahmed Enviado el: sábado, 04 de abril de 2009 05:54 a.m. Para: materials-welding@googlegroups.com Asunto: [MW:1878] Fillet welding of shell to bottom joint of API 650 Tanks   Hi, Can anybody describe the maximum gap allowed between shell to bottom joint of API 650 tank. It is a ' T ' joint requiring fillet weld. Bottom plate thickness is 10 mm and shell plate thickness is 12 mm. Also please descirbe the relevant API 650 or ASME IX paragraph.   With Regards.   Ahmed

 

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