Why must Purple-K extinguishers not be used in POL operations?

Purple-K extinguishers should not be used in POL (Petroleum, Oil, and Lubricants) operations primarily because they are highly corrosive. The chemical composition of Purple-K, which contains potassium bicarbonate, can result in significant damage to equipment and structures when it comes into contact with petroleum products. In environments where POL products are handled, using a corrosive agent can lead to further complications, including deterioration of safety equipment, equipment failure, and potentially even making the situation worse in a fire incident.

In addition, the corrosive nature of Purple-K can pose a hazard to personnel, as it may produce harmful chemical reactions with certain fuels. Therefore, in scenarios like POL operations, where protection of both personnel and equipment is critical, using non-corrosive agents is essential to maintain safety and effectiveness in fire suppression.