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.