Zone 22

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Zone 22 Secondary grade of release gives rise to Zone 22 - a place in which an explosive atmosphere, in the form of a cloud of combustible dust in air, is not likely to occur in normal operation but, if it does occur, will persist for a short period only. For example, leaks from incorrectly fitted lids or spillages.

Housekeeping In many plants designed for the handling and processing of flammable materials, dust may escape from equipment and settle on the floor and on fixtures and fittings in the workroom. In the settled state the dust is not explosive but any unusual shock may displace some of it and disperse it in the form of a dust cloud. This shock is often caused by a relatively mild primary explosion inside the plant, the flame from which serves as a means of ignition for the dust cloud formed in the workroom.

This secondary explosion disperses more of the dust accumulated in the workroom and ignites these clouds until the whole building is swept by the explosions. Accumulation of dust in workrooms is the cause of major explosions and its elimination is vital.


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The following precautions should be observed: All joints should be flanged and packed. All inspection doors, slide valves etc.

To prevent dust from entering the workroom these points should be enclosed as far as possible by means of a hood or cabinet. The access openings should be reduced to a minimum. Local exhaust ventilation should be provided to control the dust cloud within the cabinet. Sack storage should be avoided in rooms in which milling and similar processes are carried out.

ATEX zones for dusts

Such storage should be in a separate warehouse from which all plant in which a primary explosion could occur is excluded. It must be prevented from accumulating in workrooms by the regular and frequent cleaning of all parts of the room and plant on which it may settle. Careful design and construction of workrooms facilitates this cleaning. All horizontal surfaces on which dust can collect should be avoided.

Window sills, door frames and projecting fittings should be made flush with the wall. In DSEAR, an explosive atmosphere is defined as a mixture of dangerous substances with air, under atmospheric conditions, in the form of gases, vapours, mist or dust in which, after ignition has occurred, combustion spreads to the entire unburned mixture. Atmospheric conditions are commonly referred to as ambient temperatures and pressures. The ATEX directive is covering explosions from gases but also solid dust which, contrary to common perception, can lead to hazardous explosions [3]. Zone 0 — A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is present continuously or for long periods or frequently.

Zone 1 — A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. Zone 2 — A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.

Zone 20 — A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, or for long periods or frequently.

ATEX dust zones | Zone 20 | Zone 21 | Zone 22

Zone 21 — A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally. Zone 22 — A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only. Effective ignition source is a term defined in the European ATEX directive as an event which, in combination with sufficient oxygen and fuel in gas, mist, vapour or dust form, can cause an explosion.

Methane, hydrogen or coal dust are examples of possible fuels. From Wikipedia, the free encyclopedia. This article has multiple issues.

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