What should the protective coating on underground steel pipe primarily protect against?

The protective coating on underground steel pipe is primarily designed to guard against corrosion. Steel is susceptible to rust and degradation when it encounters moisture and various soil conditions, which can lead to significant structural issues over time. The protective coating creates a barrier that prevents moisture from contacting the steel surface, effectively reducing the risk of electrochemical reactions that cause corrosion.

Corrosion not only compromises the integrity of the pipe, leading to potential leaks or failures, but it can also result in costly repairs and disruptions in service. Therefore, using a robust protective coating is crucial in extending the lifespan of steel pipes installed underground, where exposure to water and other corrosive elements is common.

While temperature fluctuations, physical damage, and insect activity may impact steel pipes in specific scenarios, the primary concern for underground installations is the prevention of corrosion, which can have the most significant and detrimental effect on the pipe's functionality and durability.