| 7. While draining, visually observe the flow of the petroleum through the sight glass just down stream of the prover drain valve. Once the main flow stops, then after 30 seconds close the prover drain valve. 8. Turn off pump when all fuel is drained from the interconnect piping. 9. Close the pump isolation valve. Testing Procedure: 1. Ensure the professional trailer is grounded to a proper earth ground using the retractable grounding cable attached to the trailer. 2. Verify that the prover drain valve is closed. 3. Fill the prover until the meter being checked reads the nominal capacity of the prover. |