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Dynamic Backpressure Test

A test procedure prescribed in PEI’s Recommended Practices for Installation and Testing of Vapor Recovery Systems at Vehicle Fueling Sites.

The procedure, also referred to as a “dry test,” is conducted to make sure that vapors displaced during the fueling process will move properly from the vehicle fuel tank back through the system to the motor fuel storage tank.

The test simulates the pressure required to move the vapors during a routine fueling operation. The pressure-inducing material used in the test is nitrogen.

See also PEI/RP300