What is the purpose of using steam coils in gravity tanks?

The purpose of using steam coils in gravity tanks primarily revolves around preventing ice formation. In scenarios where water is stored in gravity tanks, especially in colder climates, there's a risk of the water freezing. If the water freezes, it can block access to the water supply and potentially cause damage to the tank or associated infrastructure.

By introducing steam coils, which circulate steam through the coils, the temperature of the water can be maintained above freezing levels. This method is effective because it provides a constant source of heat that helps keep the water at a manageable temperature, mitigating the risks associated with ice formation. Thus, preventing ice build-up ensures the tanks remain functional and accessible during winter months or in cold weather conditions, which is critical for consistent water supply and system reliability.