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PDFWAC 296-307-45515

Provide bottom drains.

A bottom drain is not required if:
1. The viscosity of the liquid makes it impractical to empty the tank by gravity or pumping;
2. The dip tank has an automatic closing cover that meets the requirements of WAC 296-307-45530.
(1) The employer must provide a bottom drain on all dip tanks that hold more than five hundred gallons of liquid.
(2) The employer 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.
Discharges to a safe location could be a:
1. Safe location outside the building;
2. Closed, properly vented salvage tank or tanks that can hold more than the dip tank.
(3) The employer must make sure manual operation of the bottom drain is performed from a safe and easily accessible location.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-45515, filed 10/20/20, effective 11/20/20; WSR 03-10-068, § 296-307-45515, filed 5/6/03, effective 8/1/03.]
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