If a spray-on liner is to be applied to a substation oil containment pit, it must be at least how many mils thick?

The requirement for a spray-on liner to be applied to a substation oil containment pit to be at least 40 mils thick is based on the need for sufficient durability and resistance to the chemicals and conditions present within the containment area. A thickness of 40 mils (thousandths of an inch) provides a robust barrier that can withstand potential punctures, tears, and the properties of the substances it will contain, such as oil and other hazardous materials.

Having a thicker liner ensures better performance over time, reducing the likelihood of leaks or failures that could lead to environmental contamination. It also helps in adhering to regulatory requirements that dictate minimum standards for containment measures in substations and other industrial settings. This thickness is typically recommended following best practices and industry standards for secondary containment systems, ensuring maximum protection for the surrounding environment.