This was taken from the Industry Regulators web site on Gas bottle refills
should answer your question
Website where infomation found
http://www.technicalregulator.sa.gov.au/public/GI_ind_reg/third_level/G3_ind_reg_tech_reg.html
Filling Portable LP Gas Cylinders
FOR BETTER INFO GO TO THE ABOVE URL
SEEYA LOCALLAW
Gas Certificate of Compliance >
Using a Licensed
Gas Fitter >
Using Natural Gas Safely >
Buying Appliances
Installing Appliances
Importance of Ventilation
Using Appliances Safely
Meters &Appliance Lighting
If you smell gas
Using LP Gas Safely >
Buying Appliances
Installing Appliances
Importance of Ventilation
Using Appliances Safely
Cylinders & Fittings
Filling Portable LP Gas Cylinders
If You Smell Gas
LP Gas Safety Pamphlets
Cast Studies
(LPG/Auto) Gas >
The maximum fill for portable cylinders is 80%, to allow room for expansion of cylinder contents. The empty weight is stamped on the cylinder, so the amount of gas which is left can be estimated by weight. Some cylinders can have a contents gauge fitted.
Cylinders can only be refilled legally if they have a valid 10-year stamp on the collar, neck or foot ring. If out of date, the cylinder must be tested before refilling.
Cylinders must be tested at an authorised
test station. If serviceable, they are re-stamped for another 10 years' use. If not, they will be destroyed.
Names and addresses of authorised
test stations can be obtained from Standards Australia, your gas supplier or the Energy Information Centre.
Never dispose of unserviceable cylinders at the rubbish dump or in the rubbish collection - they must be disposed of through an authorised
test station, LP Gas supplier or filler.
Never fill portable LP Gas cylinders from automotive (Autogas) dispensers - this is both illegal and dangerous.
Autogas is a mixture of propane and butane. Australian LP Gas appliances are designed ONLY for use with commercial LPG which is predominantly propane.