[MW:14653] LWN flange...............

 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