"Hydrotesting of CS tanks using seawater"

Question:

"At one of the sites, due to water scarcity, we are forced to use seawater for hydrotesting of a 1,00,000 litres capacity CS storage tank. The tank is likely to be in contact with seawater for a duration of about 3 weeks. As per the equipment specification, the inside surface is coated with one coat of inorganic zinc silicate. What are the precautions one should take while exposing Carbon steel temporarily to seawater for a short duration like this?"

Answer:

You should be able to contain seawater in an inorganic zinc silicate coated carbon steel tank for three weeks without severe effects. A main precaution would be sure and completely drain and flush the tank and associated piping after the hydrotest.

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