Hi everyone,

Notes on drawing, " Post weld heat treated do not burn or weld",

For a long vessel (cladded) with PWHT , one piece fabrication is not possible due to access at site. If the vendor will do the furnace PWHT in two pieces at shop . What will be the precautions in welding the last joint at field since both piece are already PWHT. Is there any additional NDT required.

Thanks again,
Gilbert

Nothing special, closing seam shall be welded the same way as the other seams, NDE as well. Local PWHT can be done per UW-40 (a)(3) and UCS-56. The double PWHT cycle should be taken into account in PQR for the adjacent longitudinal welds, if the vessel is subject to impact testing (simulated PWHT time at least 80 percent of the total aggregted time). The User should be advised for the possible decay in corrosion resisting capacity of the clad material, presume it is austenitic s.steel. Mauro

Yes Gilbert,

You can go with Mr Gonzaga. According to Mr Gonzaga below sentence is more important .

The double PWHT cycle should be taken into account in PQR for the adjacent longitudinal welds, if the vessel is subject to impact testing (simulated PWHT time at least 80 percent of the total aggregted time).

inthu

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