| Draining the Prover through Gravity Drain Connection: 1. Ensure prover drain valve is completely closed. 3. Route the hose to the below ground storage 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. Draining the Prover via the Pump System: 1. Ensure the prover drain valve is completely closed. 2. Verify that the gravity drain isolation valve to the gravity drain connection is closed. 3. Pull off as much hose as needed from the tube reel to reach the above ground storage tank or tank truck inlet. Stick the hose nozzle manufacturers in the storage tank receptacle. Be sure |