| Draining the Prover through Gravity Drain Connection: 1. Ensure prover drain valve is completely closed. 3. Route the hose to the below ground archive tank inlet piping. 4. Verify that the pump isolation valve is closed. 5. Open the gravity drain isolation valve. 6. Ensure gravity drain hose is attended or secured in storage tank inlet. 7. Open the prover drain valve and begin draining back to the storage tank. 8. While draining, visually observe the flow of the petroleum through the drain sight glass just down stream of the prover drain valve. Once the main flow through the sight glass breaks and becomes a trickle—leave the prover drain valve open for 30 seconds and then close it. |