WAC 296-835-12015. Provide bottom drains

Exemption: A bottom drain is not required if: 1. The viscosity of the liquid makes it impractical to empty the tank by gravity or pumping; or 2. The dip tank has an automatic closing cover that meets the requirements of WAC 296-835-12025 . (1) You must provide a bottom drain on all dip tanks that hold more than five hundred gallons of liquid. (2) You must make sure the bottom drain: (a) Is properly trapped; (b) Will empty the dip tank during a fire; (c) Has pipes large enough to empty the tank within five minutes; (d) Uses automatic pumps if gravity draining is not practical; (e) Is capable of both manual and automatic operation; (f) Discharges to a safe location. Note: Discharges to a safe location could be a: 1. Safe location outside the building; or 2. Closed, properly vented salvage tank or tanks that can hold more than the dip tank. (3) You must make sure manual operation of the bottom drain is performed from a safe and easily accessible location.