Oxygen Safety in Hospital: Preventing Enrichment and Fire

Why oxygen is hazardous: enrichment and fire risk

Normal air contains about 21% oxygen. In an oxygen-enriched atmosphere, materials that are normally hard to ignite can burn rapidly, ignition energy falls and fires spread faster. Enrichment can occur in a bed space, a small room, a plant room or a vehicle where oxygen leaks or is vented.

Typical ignition sources include electrical equipment, defibrillators, diathermy and surgical heat sources, smoking materials, static discharge and friction. The oxygen fire risk is therefore greatest where oxygen is used together with energy sources, such as theatres and emergency areas.

Remember that clothing and bedding can hold oxygen for several minutes after exposure. Staff should avoid ignition sources near a patient who has just been on high-flow oxygen, and ventilate the area.

Oil, grease and oxygen-clean practice

Oil, grease and many hand creams can ignite spontaneously in high-pressure oxygen. Never lubricate regulators, valves or connectors, and never handle oxygen equipment with greasy hands or gloves. Use only components designed and cleaned for oxygen service, and keep them capped until use.

Open cylinder valves slowly to avoid rapid pressurisation, which produces heat. Do not use adapters to force different connectors together. Gas-specific connectors exist to prevent misconnection; when something does not fit, stop and investigate. Faults like leaks are covered in oxygen regulator leak troubleshooting.

• No oil, grease or lubricants on oxygen equipment
• Cylinder valves opened slowly
• Gas-specific connectors, no adapters
• Equipment kept clean and capped when not in use

Alarms and valve isolation

Pipeline alarms warn of abnormal pressure, but not every leak triggers an alarm. Staff should respond to hissing sounds, smells and equipment faults, and report them. Know where the area valves are. An area valve service unit isolates the oxygen supply to a zone in an emergency such as a fire or major leak.

The digital AVSU is intended solely for emergencies and maintenance, not for routine use. It has an LED display of pressure and OK/error status, up to six gas lines and an emergency lock that can be broken open. Staff need clear signage, access and a written decision procedure about who may close a valve, since closing it cuts supply to patients.

Staff training and ward rules

Train all staff who handle oxygen on the hazards, the use of flowmeters and cylinders, and the emergency plan. Ward rules should include no smoking or naked flames near oxygen, caution with electrical devices, and safe storage of cylinders upright and secured away from heat.

Patients and visitors also need clear information. Signs, briefings and written guidance help, particularly for patients using oxygen at the bedside. For practical operation, see how to use an oxygen flow meter and the wider overview of medical gas safety.

Include cylinder handling in induction: moving cylinders on trolleys, never rolling or dropping them, and checking that the label matches the gas before use.

Incident response and review

Every ward should know its fire response: rescue, alarm, contain and extinguish, plus isolation of the oxygen supply where safe to do so. Practise drills including the use of area valves. After any incident or near miss, review causes and update procedures.

Audit equipment regularly for damage, contamination and correct labelling, and keep maintenance records. Beckfinity's specialists can advise on pipeline isolation and alarm components; contact us for guidance on your installation.