Industrial oxygen pipelines — where cleanliness is the whole design

Oxygen does not burn. It makes everything else burn — and in a pressurised line it can start that fire with no spark and no flame anywhere near it.

The mechanism is adiabatic compression. Open a valve quickly against a closed downstream, and the gas compressing into that dead space heats sharply. If there is any hydrocarbon present — a film of oil, a smear of grease, solvent residue, ordinary PTFE tape — that heat is enough. The resulting fire then burns the metal of the fitting.

Everything below follows from that.

Open valves slowly. Always, and especially into a closed or dead-ended section.

Never use oxygen for anything but its purpose. Not to blow down a bench, not to ventilate a space, not to drive tools. Oxygen enrichment in a confined space makes ordinary clothing burn fiercely and very hard to extinguish, and people have died from a habit that felt harmless.

Never lubricate anything in the system.

Keep oxygen equipment segregated. Once a regulator has been used on another service or handled with contaminated hands, it is no longer oxygen-clean, and it cannot be made clean by wiping.

This is the argument we hear most, and it is the weakest one in the industry.

An oxygen system that has not caught fire has not demonstrated that it is clean. It has demonstrated that the pressure and flow conditions needed to ignite whatever is in it have not yet coincided. Contamination accumulates; the trigger is an event, not a date. The two facts together are why these fires are always described afterwards as sudden.

Have the line surveyed instead.

A flashback can propagate into the oxygen line, and a flame travelling back toward a cascade of oxygen cylinders is not the lesser case. Two devices per line, both lines — regulator and torch. See flashback arrestors.

We size the cascade against measured consumption, supply industrial oxygen to IS 309 from our own filling works, and install and maintain the pipework. We also survey existing lines — which, on an oxygen system that has been extended over the years by whoever was available, is usually the first thing worth doing. Contact us.

Two routes, and the choice is yours. We design and install — survey, drawings, materials, installation, testing and commissioning, with the system handed over complete. Or we supply and supervise — we provide the design, the pipework and the components, and our engineer supervises while your own contractor installs. The second is often the faster route on a live site where a contractor is already mobilised, and it costs less; the first leaves one company accountable for the whole system.