I believe, there is no problem that can be done, provided ID & OD for both (#150 & # 300) are exactly same. But sure Contractor have to revise Drawing indicating Butt Joint of LWN Flanges, and need to submit for Client Approval. if Client feels, He may ask Contractor to submit Repair Method Statement.
-- On Fri, Jun 22, 2012 at 7:19 PM, Dindo <dindodelacruz@gmail.com> wrote:
the contractor needs to resubmit their drawing and calcs for approval before you accept the proposed procedure. As you may know, the neck of a CL150 and CL300 LWN has a difference of about 1/8".
On Fri, Jun 22, 2012 at 6:33 AM, shanmugam govindarajan <rajansgr@yahoo.com> wrote:--Dear Experts,Please clarify the below problem.Contractor has welded 2" 150# LWN flange with the vessel. Approved drawing requires 2" 300# LWN flange. Contractor proposes to cut and remove the bolting part of the LWN flange and weld with the 300# bolting part of LWN flange. Their intention is not to disturb the vessel and due to tight schedule. But I told them that entire LWNF shall be removed from the vessel and shall be welded with 300# LWNF. Contractor says calculation for both 150# and 300# is same , so there is no problem.Please clarify whether this is a correct approach.
With regards,Govi
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