2.5.6

1. 2.5.6 Operating a Propane Dispenser to Fill Vehicle-Mounted ASME Tanks To safely and efficiently fill vehicle-mounted ASME tanks, operators must be familiar with each of the basic parts of the dispensing system, features of ASME tanks, and the filling procedures. • In this module you will learn to: • Identify characteristics of propane dispensers • Inspect the dispenser prior to propane transfer • Identify features of ASME motor fuel tanks • Identify features of ASME mobile fuel tanks • Shut down and secure the dispenser • Prevent and handle emergencies

2. Figure 1. Diagram of a Typical Propane Dispenser The operating valves are shown as numbered circles. Characteristics of Propane Dispensers

3. Internal Excess Flow Valve – The liquid outlet on the propane supply tank must be fitted with an internal excess flow valve. Excess flow valves must also be installed in the piping system where a reduction in pipe size or hose diameter occurs. Figure 2a. Open Integral Internal Valve (Lever is near bracket.) Figure 2b. Integral Internal Valve Closed (Lever is away from bracket.) Characteristics of Propane Dispensers

4. Figure 3a. Internal Valve Cable Linkage Figure 3b. Emergency Shutdown (Handle Pulled Out To Open Valve) Characteristics of Propane Dispensers

5. Figure 3c. Fusible Link Figure 3d. Emergency Shutdown(Button and Handle Pushed In to Close Valve) Characteristics of Propane Dispensers

6. Quick Closing Hose End Valves – As a safeguard against overfilling containers, hose end valves must be quick closing types. Figure 4a. Open ASME Tank Filler Hose End Valve (Minimum Loss Valve) Figure 4b. Closed ASME Tank Filler Hose End Valve (Minimum Loss Valve) Characteristics of Propane Dispensers

7. A propane decal (Figure 5) is required on vehicles equipped with motor and/or mobile fuel tanks. Figure 5. Propane Diamond Decal Propane Motor Fuel Vehicle Decal

8. Figure 6a. Placement of Propane Diamond Decal for Motor Fuel Figure 6b. Placement of Propane Diamond Decal for Concealed Mobile Fuel Tank on Recreational Vehicle Vehicle Propane Motor Fuel Decal

9. If the tank does not have a data plate, or if its working pressure is not at least 250 psi, you must not fill it. Liquid Service Valve Figure 7. Liquid Service Valve Handwheel Features of ASME Motor Fuel Tanks

10. ACME Filler Valve. Figure 8. Cutaway of Double Backflow Check Filler Valve Never fully remove the filling adapter from a filler valve until the gas has stopped venting Features of ASME Motor Fuel Tanks

11. Stop Fill Valve Figure 9. Motor Fuel Tank Cut-Away with Stop-Fill Valve Features of ASME Motor Fuel Tanks

12. Fixed Maximum Liquid Level Gauge – When liquid vents from the hole, it condenses the moisture in air into a visible fog that indicates that filling must be stopped. Figure 10. Fixed Liquid Level Gauge Features of ASME Motor Fuel Tanks

13. Figure 12. Data Plate, Valves, Gauges and Fittings of a Motor Fuel Tank Features of ASME Motor Fuel Tanks

14. Figure 13. Vapor-Tight Valve Enclosure Features of ASME Motor Fuel Tanks

15. Motor Fuel Tank Filling Procedures

16. Motor Fuel Tank Filling Procedures

17. Motor Fuel Tank Filling Procedures

18. Figure 14. Mobile Fuel Tank Valves and Fittings Mobile Fuel Tank Filling Procedures

19. Mobile Fuel Tank Filling Procedures Before the filling procedure is started, shut off the service valve to eliminate the fuel supply to the pilots of the gas appliances. Notify the vehicle operator that you are turning the propane fuel supply off at the service valve and verify with him or her that appliance pilots are off. Allow ample time to ensure pilots are extinguished. Be sure that everyone has exited the vehicle before beginning the filling procedures.

20. Mobile Fuel Tank Filling Procedures

21. Mobile Fuel Tank Filling Procedures

22. Mobile Fuel Tank Filling Procedures

23. Shutting Down and Securing the Dispenser • When the dispenser is not in use, or at any time that a qualified dispenser operator is not in attendance, the dispenser should be shut down and secured in keeping with company operating procedures. • The shut down procedure should ensure that: • Dispenser operating valves are closed. • Transfer hoses are secured in storage cabinets or their designated locations, and the disperser cabinet or fence gates are closed and locked.

24. Preventing and Handling Emergencies • Precautions in the Event of an Emergency • Avoid becoming trapped within the dispenser area if there is an uncontrolled release of propane. • Keep other people away from the area. • Move and stay upwind of a propane leak or fire. • NEVER enter a propane vapor cloud. • Eliminate sources of ignition. • Activate the plant fire/emergency notification system. • Send someone to call the fire department to report the nature of the emergency.

25. Preventing and Handling Emergencies • Preventing Dispenser Emergencies – An emergency exists at a dispenser if there is an uncontrolled release of propane, or a fire. Emergencies can be prevented by strictly following the safety rules and procedures provided in LP-gas safety codes and company procedures. • Periodically inspect and properly maintain the components of the dispenser.Keep other people away from the area. • Never fill a container that is unsafe or does not meet inspection criteria for continued service. • Strictly enforce dispenser operating safety rules. Be polite and tactful with customers. Explain the safety rules and the reason for the rules, but do so in a firm manner if necessary • Don’t ignore obvious irregularities and abnormal operationconditions.

26. Propane Fires and Emergencies – In any propane emer-gency where there is fire, flames should be extinguished ONLY BY SHUTTING OFF THE FLOW OF GAS. • You should take the following steps in the event of a fire or emergency (unless a fire is near the storage tanks or valves): • If there is an emergency shutdown on the container piping, activate it. • Close all accessible valves in the liquid and vapor lines. • Shut off the electrical power at the main power supply. • Stay away from the dispenser and keep others away from the area. • Do not operate a dispenser that has been exposed to fire. Preventing and Handling Emergencies

27. Time to See If You Got the Key Points of This Module… • Complete the Review on page 15. • See if you are ready for the Certification Exam by checking off the performance criteria on page 16.