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Corrosion Fundamentals

Corrosion Allowances

Engineering designers must consider how much metal is necessary to withstand the anticipated load for a given application. Since they can make mistakes, the use of the structure can change, or the structure can be misused, they usually are required to over design the structure by a safety factor that can vary from 20% to over 300%. Once the necessary mechanical load safety factor has been considered, it becomes necessary to consider whether or not a corrosion allowance is necessary to keep the structure safe if it does corrode.

Extra Steel added to a Pillar on a Oil Platform

The picture above shows extra steel added to the bottom of an offshore oil production platform. The one inch of extra steel was added as a corrosion allowance.

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