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Carbon Steel in Seawater 1
When using carbon steel in seawater without a coating or cathodic protection, it is common to use a corrosion allowance, say 3mm. However, this is making an assumption about the uniform corrosion rate of steel. In quiescent seawater it is about 0.1mm/y, rising to ~0.8mm/y at 3m/s flow velocity.
Even at low flow rates, the pitting of carbon steel in seawater is much faster than general corrosion, with typical rates of perforation of 2mm/y at 0.5m/s flow velocity. This is why carbon steel pipes carrying seawater usually perforate in 18 months to 2 years, depending on flow velocity, unless additional protective measures are used.
Posted on: 7th July 2017