CORROSION ALLOWANCE AND ASME B16.34
CORROSION ALLOWANCE AND ASME B16.34
(OP)
ASME B16.34 does not appear to allow for any corrosion allowance in the WT. I know that the WT required per the standard is very conservative and is based on very low stresses. Does any one have any views regarding ASME B16.34 WT and corrosion allowances? Is it necessary to increase the thickness over and above ASME B16.34 requirements if you could demonstrate by calculation that the thickness is adequate, and still in compliance with the standard?





RE: CORROSION ALLOWANCE AND ASME B16.34
RE: CORROSION ALLOWANCE AND ASME B16.34
RE: CORROSION ALLOWANCE AND ASME B16.34
However, if based on their experience, they want some thickness greater than the B16.34 minimum, then I suppose you would need to supply a valve that had that thickness.
RE: CORROSION ALLOWANCE AND ASME B16.34
E.g. if 5 mm corrosion allowance should be added to a DN 200 flange I would need it in PN 160 (according to DIN 2638) to have it with 5 mm more neck wall thickness than the one in PN 40 (according to DIN 2635). I asked a dealer of flanges and he said that I should just order it as PN 40, but with additional (non-standard) wall thickness.
For flanges the difficulties seem not so big, but when it comes to asking for additional corrosion allowance on valve bodies, I am not sure how to cope with it. Can a valve manufacturer tell me what pressure rating I need, if I give the design pressure and temperature and the corrosion allowance?
RE: CORROSION ALLOWANCE AND ASME B16.34
NW Florida