The following procedure is from Siegel Gas & Oil Corp. (an LPG supplier in Florida):

"HOW TO FILL A PROPANE CYLINDER FROM A DISPENSER TANK

These procedures should always be followed when filling a propane cylinder from a dispenser tank:

* Put on safety goggles and gloves.

* Remove the propane cylinder from the forklift. NEVER FILL
THE CYLINDER WHILE IT IS STILL ON THE FORKLIFT.

* Visually inspect the propane cylinder for damage or leaks.
Check the certification date of the cylinder. Cylinders
should initially be recertified after 12 years and then every
5 years thereafter. If you have a cylinder that needs
recertification call Siegel Gas.

* Properly connect fill hose to fill valve on top of cylinder by
hand. NEVER USE TOOLS TO TIGHTEN OR LOOSEN
CONNECTIONS.


* Slowly open the valve at the end of the hose.

* Open the fixed liquid level gauge (spit valve) on top of the
cylinder.

* When the cylinder reaches 80% of capacity the spit valve
will begin "spitting" a white vapor (liquid propane.) Shut
off the hose first and then close the spit valve. NEVER
OVERFILL THE CYLINDER

* Remove the hose and check the cylinder for leaks with a
non-corrosive leak detection solution solution.

* Make sure o-rings are in their proper places.

* Load the full propane cylinder on the equipment. Make
sure the propane cylinder-centering pin enters the aligning
hole in the propane cylinder collar.

* Close the stabilizing clamp to hold the propane cylinder in
place.

* Connect the fuel line to the propane cylinder.

* Slowly open the service valve on the propane cylinder.

* Check for leaks with a non-corrosive leak detection
solution.

* Shut off the electric pump [if applicable]."