Standard propane cylinder exchange:
1. Never smoke, or have any open flames or sparks
2. It is during the circle check that one determines that there is not adequate propane left in the cylinder
3. Take the truck to a well venitlated area
4. Park the truck...tranny in neutral, parkbrake on, forktips flush with ground
5.. Put on PPE and shut off liquid service valve
6. Rev the engine until it stalls
7. Restart the engine to ensure that all remaining propane has been depleted
8. Once satisfied, shut off engine
9 Remove the cylinder
10. Store the cylinder according to municipal fire codes
11 Check new cylinder for date and damage
12 Install cylinder with safety relief valve at 12 oclock position
13 Reconnect couplings
14. Open liquid service valve, 1/4 turn, then all the way. Check for leaks.
15. If all's fine, clamp the cylinder down onto the counterweight.

And that is how changing a cylinder should be done.

Batteries:
Check two cells per day minimum, depending on age of batteries
Fill to 1/8" above the seperator plate
Close vent cap
Clean off any spilled water, or any excess electrolyte
All while wearing PPE

Gasoline/Diesel:
Only use proper containers or dispensing equipment
Put the nozzle in the hole
Fill er up
Close cap and wipe clean any excess spilled gas/diesel

And that is how you do it.

Starting to get cold here in Canada. Wouldn't mind coming to your factory and providing the training for your staff!!!!!!

Hope this helps. It is the only, and proper way of refuelling.

Danny