Weld Overlay PWHT
Weld Overlay PWHT
(OP)
Section VIII, Div. 1 pressure vessel constructed using SA516GR70 (P1) material. Thickness is 1".
I will machine a 3" wide 3/16" deep groove around a 10" opening in the shell. Machined out groove will then be weld restored using Type P4 weld
A 14" Dia - 1/2" wall carbon steel (P1) nozzle will be welded to P4 weld restored area using P1 weld.
Is PWHT required?
Thanks
I will machine a 3" wide 3/16" deep groove around a 10" opening in the shell. Machined out groove will then be weld restored using Type P4 weld
A 14" Dia - 1/2" wall carbon steel (P1) nozzle will be welded to P4 weld restored area using P1 weld.
Is PWHT required?
Thanks





RE: Weld Overlay PWHT
RE: Weld Overlay PWHT
Whatever it is, if the original fabrication called for PWHT then you probably need to do it again. Remember that PWHT is often done for reasons other than Code rules.
RE: Weld Overlay PWHT
The P4 weld no. weld overlay is applied for erosion/corrosion protection of the portion of the vessel wall that is internal to the pipe and to maintain protection internally at the nozzle to vessel wall juncture. The nozzle will have an internal CrMo liner that will also act as the backing bar for the nozzle to vessel wall weld.
RE: Weld Overlay PWHT
RE: Weld Overlay PWHT
RE: Weld Overlay PWHT
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Weld Overlay PWHT