Sunday, April 7, 2013

Re: [MW:17303] OVERLAY WELDING - SHRINKAGE PROBLEMS

Dear David,

With respect to the scenario, the outside circumference should be approx 18mm to 24 mm more that the required one. Strip cladding option would have been a better one.The stiffener used on the outside shall atleast be off 40mm with out any gaps (between the ID of the stiffener and OD of the vessel). Ovality is to be rectified before the overlay process is being initiated. The length of the shell will also decrease to about 6 to 8 mm. Care has to be taken in regard to this. For dished ends similar ring on the edge to be provided keeping the allowance in mind as we have maintained in the shell.

Hope this info helps you.

Regards,

Nitin Shetty


On Fri, Apr 5, 2013 at 9:50 AM, Chan, David <David.Chan@exterran.com> wrote:

Dear All ,

I would like to seek your advice with regard to the overlay welding of a pressure vessel of about 5'-0" in diameter and about 5/8" wall thickness

The wetted parts of the pressure vessel (PV) is about 3'-0" from the Circumferential weld seam to the bottom dished head.

 

We intend to put ER309L (2.4mm diameter - SAW Process) for the buffer followed two more layers of ER316L-16 (SAW Process)

We believe that there is a high possibility of distortion on the diameter after the overlay welding and we intend to tack weld at least ½" thick strong circular on the external diameter of the PV  

We are thinking of putting three circular braces @ 12" spacing.

 

Please advise your thoughts on the above.

 

In addition, the bottom dished head of the same nominal wall thickness (5/8") also needs to be overlay with the same welding process and again, we think there is a probability of distortion

We are thinking of putting a circular brace near the edge of the weld joint and nothing else.

 

Again,  please advise your thoughts on the above.

 

Thank you in Advance

Best Regards

 

David Chan

Singapore

 

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