More oxygen does not mean more safety

Oxygen supports combustion although it is not a fuel. Enrichment of the atmosphere can cause materials to burn more readily and fiercely. It must not be confused with oxygen deficiency, which creates a different hazard. Both scenarios are considered in hazardous atmosphere measurement where the process can produce them.

How enrichment occurs

Leaks from hoses, valves or connections and inadequate ventilation may increase concentration. Misuse of the gas can also cause it. Oxygen must not be used to cool a space, clean clothing or replace compressed air. Lack of odour or a visible cloud does not rule out atmospheric enrichment.

Equipment compatibility

Components must suit oxygen service and the relevant pressure and operating conditions. Oils, greases and incompatible materials may react dangerously. Do not improvise adapters or lubricants. Selection, cleaning, assembly and maintenance require specific instructions and competent personnel, particularly when working with pressurised systems.

Controlling the environment

Prevent leaks, maintain intended ventilation and control ignition sources. The need for detection and its thresholds is determined through assessment and the applicable framework. A combustible gas meter does not replace an oxygen sensor. An initial reading also does not guarantee that concentration remains unchanged throughout the task.

A leaking-hose example

During hypothetical maintenance, a damaged hose is discovered in a poorly ventilated area. The priority is to follow the safety procedure, control access and have competent personnel eliminate the cause. Moving combustible materials aside and continuing is insufficient. Exposed clothing may also require prescribed precautions before approaching an ignition source.

Response and training

People must recognise prohibited uses, report damage and know how to respond to a suspected leak. Isolation operations are performed only where they can be carried out safely under the procedure. Afterwards, check the atmosphere and installation before restarting work. Training must clearly distinguish oxygen hazards from those of inert or combustible gases.