What must a recirculation tank have if it contains a pump?

A recirculation tank containing a pump must have an access manhole that is at least 12 inches in diameter. This requirement ensures that the tank is accessible for maintenance and inspection purposes. Given the active role of a pump in the tank, it is vital to have proper access for tasks such as removing the pump for repairs, inspecting its operation, and conducting routine maintenance. The larger access size facilitates easier handling and reduces the risk of damage to components during such operations.

Access manholes also play a critical role in venting the tank and ensuring that any build-up of gases can be safely managed. This is especially important in a system where pumps can create pressure changes within the tank. Overall, having an adequately sized access manhole is a necessary safety measure as well as a practical requirement for effective maintenance of the recirculation system.