Corrosion Allowance 5 W.O / 3 CLAD
Corrosion Allowance 5 W.O / 3 CLAD
(OP)
The shell and channel material of a heat exchanger is SA 387 Gr.11 Cl.2+SA 240 TP.347 CLAD, the tube material is SA 213 TP.347. The corrosion allowance of shell side and tube side is 5 WO./3 CLAD. The shell and channel thickness is 22+3mm and 19+3.5mm respectively. The specification of the tube is 19.05mm×1.65mm. The thickness value of tube is lower than corrosion allowance of tube side. So I am confused now. Could anybody explain it and what corrosion allowance 5 W.O / 3 CLAD means. Thanks very much.





RE: Corrosion Allowance 5 W.O / 3 CLAD
"5 W.O / 3 CLAD" My guess is that this statement means the corrosion allowance would be 5 mm on bare base metal or is 3 mm of cladding, i.e zero corrosion allowance on the base metal.
Regards,
Mike
RE: Corrosion Allowance 5 W.O / 3 CLAD
5 WO /3 Clad should be either WO or Clad. because generally tubes will have zero CA and moreover SA 213 TP 347 is of the composition - 18Cr-10Ni-Cb and CA is not needed. It is very difficult to give CA of 3.5mm to a tube thickness of 1.65mm.
RE: Corrosion Allowance 5 W.O / 3 CLAD
Regards,
Mike
RE: Corrosion Allowance 5 W.O / 3 CLAD
5mm thick weld overlay....(3mm deep of good metal and 2mm allowance for dillution of the base metal)
3mm if it is roll bonded or explosion bonded clad.
RE: Corrosion Allowance 5 W.O / 3 CLAD