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WAC 296-307-45515

Provide bottom drains.

Exemption:
A bottom drain is not required if:
 
– The viscosity of the liquid makes it impractical to empty the tank by gravity or pumping
 
or
 
– The dip tank has an automatic closing cover that meets the requirements of WAC 296-307-45530.
You must:
• Provide a bottom drain on all dip tanks that hold more than five hundred gallons of liquid
• Make sure the bottom drain:
– Is properly trapped
– Will empty the dip tank during a fire
– Has pipes large enough to empty the tank within five minutes
– Uses automatic pumps if gravity draining is not practical
– Is capable of both manual and automatic operation
– Discharges to a safe location.
Note:
Discharges to a safe location could be a:
 
• Safe location outside the building
 
or
 
• Closed, properly vented salvage tank or tanks that can hold more than the dip tank.
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 03-10-068, § 296-307-45515, filed 5/6/03, effective 8/1/03.]
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