Pressure Testing

Instructions for pressure testing your system with one of our 'G' model regulators:


1. Close all appliance valves.

2. Open cylinder valve, and allow indicated gauge pressure to stabilise.

3. Close cylinder valve, and observe pressure gauge reading for 3 minutes.

4. The pressure gauge reading should remain constant if there is no leak in the system.  


A pressure gauge cannot provide an indication of liquid LPG remaining in the cylinder, only its vapour pressure, which is a constant at any given temperature.

As a guide, Campingaz is usually Butane, but sometimes it is a mix of Butane and Propane. Propane is added where Campingaz is used in winter and cooler climates.

Butane and Propane have different cylinder pressures for any given temperature. 

BUTANE: Approximate pressures relative to ambient air temperature:

If you have a mixture of Butane and Propane the pressures given on the graph could be higher, up to double for the same ambient air temperature, this is why the gauge scale has to be 0-10 bar

The primary use of the gauge is for leakage testing, on the low pressure side. 

I.E. from the outlet of the regulator to and including the appliance. 

This down stream has a pressure of 30 mbar

So when testing, if you have a very small leak, it will take some time for the gauge to react/decrease, hence the 3 minutes duration of testing. The actual pressure reading is irrelevant, you are only looking for a pressure drop over the 3 minutes.

I leak on the high pressure side, would result in the pressure gauge reading dropping quickly and you would likely smell gas in your cylinder locker.


1. Shut off the LPG supply at the main supply valve.

2. Extinguish any naked flames and other sources of ignition.

3. Do not operate electric switches.

4. Ventilate the area by mechanical means ONLY

Do not use the installation until it has been inspected/repaired by a "competent person".

© 2020 Will Hayward

Site By: Rob Hayward Media.


Terms & Conditions

Legal Notice & Disclaimer

Apologies, all prices exclude tax