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PDFWAC 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.
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.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 17-18-075, § 296-835-12015, filed 9/5/17, effective 10/6/17; WSR 07-03-163, § 296-835-12015, filed 1/24/07, effective 4/1/07. Statutory Authority: RCW 49.17.010, [49.17].040, and [49.17].050. WSR 02-15-102, § 296-835-12015, filed 7/17/02, effective 10/1/02.]
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