Carbon Steel with Cladding Cu-Ni

[Peregrino7]

I have a Shell & Tube Heat Exchanger where tubes shall be SB-111 C71500 (Cu-Ni 70-30). In this order:

1) Channel is Carbon Steel with Cu-Ni 70-30 cladding.
2) Tubesheet is forged Carbon Steel with Weld Overlay Cu-Ni- 70-30 (channel side).

Is it correct to specify:

SA-516-70 + cladding Cu-Ni
SA-266 Cl4 + W.O. Cu-Ni


My question is regarding what would be the correct ASME specification for this Carbon Steel Sheet + cladding and the Carbon Steel Forge + Weld Overlay.

I see that SA-265 is a sheet intended for this use... but isn't that more expensive? And for forge C.S. what would be the correct specification?

Thanks for your answer...!



GH

 

[metengr]

Section II of the ASME B&PV Code has a Standard Specification for Heat Exchanger channel barrels and tubesheets, etc., made of carbon steel or low alloy steel forgings, carefully review SA-765. You need to know your minimum design metal temperature for this heat exchanger. SA-266 Standard Specification could also be used, but I prefer SA-765.

Once you decide on the necessary Standard Specification for the tubesheet and channel barrel forgings, I would specify a CRO (corrosion resistant overlay) with the minimum deposit thickness.