I have been searching through various standards with regards to determining a corrosion rate for steel in water. I basically have a component which is connected to the bottom of a turret on a FPSO made from ASTM A182 f22 (approx 30m below the surface at 30 deg C). The component has an epoxy paint system all over and is cathodically protected for the most part, except from a portion on the inside which has to be accounted for via an allowable corrosion allowance. I know this is dependant an numerous thing such as temperature, oxygen etc, but there must be some standard corrosion rates available for such an instance. Currently I have assumed an average rate of 0.15mm/yr. The only standard I have found of any use is a DNV position mooring chain standard but feel this is not particularly applicable due the material type. If anyone could offer any advice this would be much appreciated.
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