What is drain hub and why used in oil refinery?

A drain hub is a component in an oil refinery that collects and directs the flow of liquids, such as water and hydrocarbons, away from equipment and processes to prevent contamination and maintain operational efficiency. It helps manage the drainage of waste products and prevents the accumulation of potentially harmful substances. By facilitating proper drainage, it contributes to safety, environmental compliance, and the overall efficiency of refinery operations.