Example of Reversal of Flow – Backflow Backsiphonage Case 5

The gasoline storage tank is maintained full and under pressure by means of a direct connection the public water distribution system.

Gasoline may enter the public water distribution system by gravity or by siphonage in the event of a leak or break in the public water distribution system.

A backflow prevention device such as a reduced pressure principle backflow prevention device should be installed in the line to the gasoline storage tank or a surge tank and pump should be provided in that line.