Gas

Gas can be supplied from the mains supply or a storage tank. It can also be supplied from smaller portable cylinders used close to the work site. Types of gas commonly used in the workplace, include:

• natural gas
• liquefied petroleum gas (LPG)
• LPG autogas (LPGA)
• medical gases
• methane

There are a number of risks when using gas, such as explosion from damaged, overheated or poorly maintained cylinders, pipes equipment or appliances. There is also the risk of carbon monoxide poisoning and burns caused by contact with flame or hot surfaces.

Carbon monoxide poisoning

When gas does not burn properly, or is used in an area without adequate ventilation, it produces excess carbon monoxide (CO) which is a colourless and odourless gas. This can happen regardless of the type of gas being burned, whether from cylinders or a mains supply.

When inhaled, carbon monoxide binds with the haemoglobin in the blood and reduces the blood's ability to carry oxygen. This can result in death.

There is a risk of carbon monoxide poisoning where:

• there is not adequate ventilation in the room where the appliance is located
• a flue or chimney is blocked and cannot vent the system properly
• an appliance has not been fitted and regularly maintained by a competent person

The Gas Safe Register website has information on the requirements of a competent person​ (external site).

Carbon monoxide poisoning can kill within a matter of hours so it is important to be aware of the risk and symptoms. These include:

• ​​tiredness
• drowsiness
• headaches
• ​nausea
• chest and stomach pains

Gas leaks

As pipes can be buried in the ground, located below floors or in wall and ceiling voids, poor maintenance can lead to leaks and buildup of gas. This increases the risk of an explosion.

If you think you have a gas leak, you should:

• remove everyone from the area
• switch off the gas at the mains or supply – do not enter cellars or go below ground to do this
• extinguish naked flames and sparks – but do not turn off lights as it can create a spark
• open all windows and doors
• ​use a phone outside the property to contact the National Gas Emergency number on 0800 111999
• contact your local gas supplier

You should not:

• use any electrical equipment
• switch lights on or off
• enter cellars or go into confined spaces below ground
• light matches or have naked flames

Carry out a risk assessment

Remember to include gas usage and storage in your risk assessment. This will help you identify potential hazards and controls that need to be put in place.