I think it will create strength issues due to difference in process.
The flanges of 150 and 300 rating come in forged steel and welding the plate with neck will redeuce the joint efficiency i.e it will not remain 100 percent.
Ammar Shaikh
On Mon, Jun 25, 2012 at 7:22 PM, Lakine <lakine85@gmail.com> wrote:
Hi, I think contractor is trying to skip it. Class # 150 & #300 is different working pressure, how can they mean it is the same even the dimension is the same. It they evidence class #150 is satisfied with design, we can approve but they must submit the caculation. So far, you must refer process, working pressure in specification and operation condition to review it. The best way, you still reject except your client accept them. So, it is low risk with you.Lakin
On Friday, June 22, 2012 7:33:59 PM UTC+7, shanmugam govindarajan 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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