Non-flammable gas that can present a hazard

Oxygen

Oxygen, O2 (oxygen), is not a flammable gas and is therefore not subject to the requirements for flammable goods. However, the gas is oxidizing and supports combustion. The gas is stored under pressure (200 bar). The cylinders have a black-painted cylinder and a white top. The gas is oxidizing and facilitates ignition and accelerates the fire process, which can become explosive. When oxygen is released, the oxygen content must never be allowed to exceed 24% in the space.

Routine oxygen

Point extraction and good ventilation must be available. The gas equipment must be kept free of oil and grease and other particles to avoid spontaneous combustion. Only sealing materials and lubricants approved for the gas may be used. Because the gas is stored under high pressure in the cylinders, only equipment intended for this pressure may be connected to the cylinder outlet. Valves must be opened carefully so that the gas equipment is not exposed to pressure surges and strong gas discharge. Abnormal heating of the cylinders causes a pressure increase in the cylinder, which can lead to a vessel bursting. Pressure relief in the form of a safety valve is not available on oxygen cylinders. The gas cylinders must be handled carefully and protected against abnormal heating. When stored, the cylinders must have the valve closed and the valve cover fitted, and must be secured so that they cannot fall over and be damaged. Labels or other markings must not be removed. Storage must be separated from ignition sources in well-ventilated areas at temperatures below 50 °C.

In the event of an uncontrolled release

In the event of uncontrolled releases of oxygen, the premises must be evacuated and aired. Clothing must also be aired. Fires in oxygen-enriched clothing cannot be extinguished by suffocation, but must be cooled and extinguished with water. If possible, shut off the gas flow.

Sulphur dioxide

Sulphur dioxide is a colourless, irritant and corrosive gas with an irritating pungent odour. Sulphur dioxide is heavier than air. In the event of leakage, it evaporates generating a mist of sulphuric acid. This gas has a corrosive effect on most metals, especially at high humidity, and damages textiles and leather. It can react violently with alkalis. Liquid sulphur dioxide also corrodes plastics and rubber. Sulphur dioxide is not flammable or explosive. However, when diluted with water, sulphur dioxide can react with metals to form flammable hydrogen. Sulphur dioxide irritates the eyes and airways, leading to eye watering and coughing. Sulphur dioxide can cause corrosive damage, especially on damp areas of skin. The gas is lethal to inhale at high concentrations (about 400 ppm).

Routine sulfur dioxide

Like other gases stored under pressure, sulphur dioxide cylinders must be handled with care and the cylinders can explode when heated. Cylinders are to be stored locked up in well ventilated areas at temperatures of under 50 °C.