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You can spray the fittings on the top of a cylinder with soapy water when the line is pressurised. If your cylinder is leaking the gas will create bubbles in the soapy water. If this is the case you must turn off the gas supply and immediately contact KLM Gas.

As a safety feature LP Gas has a strong, distinctive odour added to it for the detection of even minor leaks. All LP Gas is non-toxic, non-corrosive and clean burning. But if inhaled in sufficient volumes it can cause suffocation.

Apart from weighing the gas cylinders there is no sure why to determine how much gas you have in the cylinder(s). There are currently no accurate devices to determine the gas levels either so be careful not to be sucked into buying devices advertised on the internet.
The best way to check is by using the boiling water test. Please be careful with doing this test to avoid burning with the boiling water

1. Boil up a jug of water
2. Pour the boiling water down the side of the cylinder in a strip from top to bottom
3. Wait at least a minute, taking caution not to burn yourself
4. Run your hand slowly from the top to bottom of the cylinder, if at some point the metal feels cool this can indicate the approximate level of gas if any.
5. The procedure may need to be repeated to get a better result

Note: LPG cylinders are not filled to the top of the cylinder, they must always have a space to allow for expansion of the LP gas in the cylinder

When gas supply is switched from the empty to the full cylinder it may take a short time for the gas to flow to the appliances. It may take some time for the appliances to light because the gas which is under low pressure needs to flow to each appliance. If there is gas cooking on site it’s recommended lighting at least one burner and leaving it on for several minutes to get the gas flowing through the system.