Changing a Gas Bottle Safely
The correct and safe procedure for changing an LPG gas bottle on your motorhome or caravan.
What This Is
Changing a gas bottle is a routine task, but it must be done correctly to avoid gas leaks. This guide covers the procedure for both propane and butane bottles, and the important safety checks to carry out afterwards.
Tools & Parts Required
- Adjustable spanner or correct regulator spanner
- Leak detection spray or soapy water in a spray bottle
- Replacement gas bottle
Step-by-Step Instructions
- 1
Turn off all gas appliances inside the motorhome. Switch off the gas at the appliance controls, not just the pilot lights.
- 2
Open the gas locker. Ensure there is good ventilation — never change a gas bottle in an enclosed space.
- 3
Turn the regulator valve on the empty bottle to the fully closed (off) position. On most UK regulators, this means turning clockwise.
- 4
Disconnect the regulator from the empty bottle. Note: propane regulators have a left-hand thread (turn clockwise to loosen). Butane regulators have a right-hand thread (turn anti-clockwise to loosen). Do not force the fitting.
- 5
Remove the empty bottle and place the new bottle in the locker. Ensure it is standing upright and stable.
- 6
Connect the regulator to the new bottle. Hand-tighten first, then use a spanner to secure firmly. Do not overtighten.
- 7
Open the bottle valve slowly — no more than one full turn. This prevents a sudden pressure surge.
- 8
Apply leak detection spray or soapy water to all connections — the regulator-to-bottle joint and the hose connections. Watch for bubbles. If bubbles appear, close the valve immediately and re-check all connections.
- 9
If no leaks are detected, you can now light appliances. Always light the hob first to purge any air from the line before using the oven or grill.
Common Mistakes to Avoid
- Confusing propane and butane thread directions — forcing the wrong way can damage the regulator.
- Not checking for leaks after connecting — always test with soapy water.
- Storing spare gas bottles inside the vehicle — bottles must always be stored in a ventilated external locker.
- Using a bottle that is past its test date — check the date stamped on the collar.
Safety Warnings
- NEVER change a gas bottle near a naked flame, lit cigarette, or running engine.
- NEVER store gas bottles inside the habitation area — only in the external ventilated gas locker.
- If you smell gas after connecting, close the valve immediately, ventilate the area, and do not use any electrical switches.
- LPG is heavier than air and will sink to floor level. Ensure the gas locker drain hole is clear.
When to Call a Professional
If a leak cannot be stopped by re-tightening connections, or if you suspect a faulty regulator or hose, do not use the gas system. Contact a Gas Safe registered engineer.
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