Re: [MW:33542] HEAT EXCHANGER CONSTRUCTION

Does the tube sheet have a lip? Please share a sketch at the weld location? practically it is difficult to avoid heat exposure to duplex clad? you need to change clad material, check with your process metallurgist

On Thu, 6 Oct 2022 at 09:52, Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:

Dear Experts 

One of HEX involves  following MOCs -

HEX tubes - SA 789 TYP 32205 

Tubesheet -SA 266 CL 2 CS - Tube sheet IS cladded with TYP S32205  overlay.

Shell side - CS -SA 516 GR 70 - 75mm thk 

Channel side - CS- SA 516 GR 70 - 75 mm thk 

PWHT is required for  Tube sheet to Shell welding and Tube sheet to Channel welding. These are butt welds with CS Weld metal .

PWHT is not required for  Tube sheet to HEX Tube  welding due to DSS tube to DSS cladding.

Pl advice for the  care that shall be taken during PWHT  of Tube sheet to Shell welding and Tube sheet to Channel welding.

Thanks and regards

Vishwas - IWE

International Welding Engineer

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