Gas cylinders & bottles in a fire. Avoid devastation
Gas bottles provide a convenient and portable source of fuel for outdoor applications such as barbecues and patio heating, while gas cylinders provide a source for cooking, heating and hot water.
However, in the event of a fire, gas cylinders and bottles can become extremely dangerous, potentially turning into flame throwers or explosive devices - bombs!
Understanding the behaviour of gas cylinders and bottles in a fire and how to store them safely is essential to avoiding dangerous and catastrophic outcomes.
In this article the term gas cylinder also applies to a gas bottle.
House destroyed by a gas bottle becoming a flame thrower
How does a gas bottle become a flame thrower?
Gas cylinders are designed to vent (release) gas from the pressure relief valve when exposed to heat. This venting process cools the bottle down and reduces internal pressure thereby preventing explosions. However, if the venting gas ignites, it will flare with the resulting flames being up to 5 metres long. This will be particularly hazardous if the flames come into contact with your home or other flammable materials.
How does a gas bottle become a bomb?
This risk occurs when a gas cylinder is left lying on the ground or if it falls to the ground during a fire. In this position it cannot vent effectively and will build up intense pressure and possibly explode. The force of such an explosion can be devastating, potentially shattering windows up to 50 metres away.
What are the best practice installation and safety measures?
Install in a ventilated location as far from the house as possible.
Mounting: Always use a stable fireproof surface such as a concrete slab or concrete paver.
Secure vertically: Restrain cylinder vertically using one metal chain for each cylinder attached to a robust metal upright frame that is concreted into the ground. Ensure that any nearby structure cannot push the cylinder over if that structure fell.
Vent positioning: Ensure the vent (pressure relief valve) is directed away from flammable structures and materials. The vent is typically on the opposite side of the valve to the hose connection.
Avoid nearby combustible elements: Consider what is nearby such as a CCA treated pine retaining wall behind the bottles. If the retaining wall is ignited it can provide enough heat to cause the gas bottle/s to flare.
By taking these precautions, you can significantly reduce the risks associated with gas cylinders and bottles in a fire.
Check our Resource Hub to learn more about the risks and safety measures of gas cylinders and bottles in a fire.
Robust metal upright frame mounted on a concrete base
Location of vent (flame thrower)
Vertically against a non combustible facade like a brick or concrete wall
Drive two stakes into the ground to prevent the bottle from falling over
