AREA CLASSIFICATION – ZONING. EN / IP Zone 0: The part of a hazardous area in which a flammable atmosphere is continuously present or. Figure Hazardous area zone classification shading convention. .. referred to as IP15) is a well-established Model Code for area classification in the. Level Definition In Hazardous Area Classification Ip15 – posted in Industrial Professionals: Hello, All For those who are familiar with hazardous.

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Some reference to design codes, and commissioning checks to ensure the ventilation achieves the design aim, should be provided. The flammable materials that may be present; The physical properties and characteristics of each of the flammable materials; The source of potential releases and how they can form explosive atmospheres; Prevailing operating temperatures and pressures; Presence, degree and availability of ventilation forced and natural ; Dispersion of released vapours to below flammable limits; The probability of each release scenario.

Discussions with industry on the relaxation of this in particular circumstances are ongoing.

Hazardous Area Classification and Control of Ignition Sources

For most chemical products it is preferable to test dust taken from the process, but if the particle size distribution varies, it is common to test material that passes a micron sieve, and take this as the worst case. In this context, ‘special precautions’ is best taken as relating to the construction, installation and use of apparatus, as given in BS EN 1.

A practitioner’s handbook – Electrical installation and maintenance in potentially explosive atmospheresPublication No. Measures to prevent major accidents should address all potential initiators. A dust explosion could then be an initiator of a major accident. However, for many years we have used a small-scale screening test, the vertical tube test, described in HSG 2.


Are the risks from static discharges controlled properly? The issues about representative samples of dust, and other factors that might cause the results to vary are also discussed in this guidance.

The alternative of specifying the extent of zones more conservatively is not generally recommended, as it leads to more difficulties with equipment selection, and illogicalities in respect of control over health effects from vapours assumed to be present. Dust Explosion Prevention and Protection: The IP code considers cladsification the issue of hydrogen containing process streams as commonly found on refinery plants.

Model Code of practice in the Petroleum Industry’ Part 15 is recommended.

Factors for Assessor of a Safety Case to Consider Is a full set of plans identifying hazardous areas available? The IP code gives a methodology for estimating release rates from small diameter holes with pressurised sources, and shows how both the buoyancy and momentum of the release influence the extent of a zone.


Model Code of practice in the Petroleum Industry’ Part 15 are recommended. For COMAH sites with toxic dusts, the most likely hazard would arise in drying processes, if substantial quantities were held for extended periods hot enough to start self heating or smouldering combustion.

Electric powered vehicles can also be built using a combination of this standard and the normal electrical standards. Locations where a large release is possible and the extent of hazardous areas has been minimised by the use of mechanical ventilation should be identified, e. The most commonly used standard in the UK for determining area extent and classification is BS EN part 10 1which has broad applicability.

Zoning Hazardous areas are defined in DSEAR as “any place in which jp15 explosive atmosphere may occur in quantities such as to require special precautions to protect the safety of workers”.

Hazardous Area Classification and Control of Ignition Sources

Vehicles certified to ATEX requirements are however expensive, and for many applications an unprotected type has to be extensively rebuilt. There is in practice little overlap between the codes. Further Reading Material Cox, A. Have all flammable substances present have been considered during area classification, including raw materials, intermediates and by products, final product and effluents?


If this is possible, it is more appropriate to provide controls to prevent the spread, rather than simply apply more conservative zoning, and more restrictive rules on the equipment used in the store. LPGA codes have not previously drawn a clear distinction between hazardous areas, and separation distances required for other reasons.

The tables of dispersion distances to the zone boundary address in the main quite large diameter deliberate vents. Many sites will have operations of filling and emptying road tankers with flammable materials. These will include electrical circuits; the inlet and exhaust of any internal combustion engine; electrostatic build up; overheating brakes, and other moving parts.

The conclusions from this exercise will be made available in due course. Ignition Sources – Identification and Control Ignition sources may be: Classification of the hazardous area as in zones shown in the table above ; Temperature class or ignition temperature of the gas or vapour involved are to the table below: Area classification may be carried out by direct analogy with typical installations described in established codes, or by more quantitative methods that require a more detailed knowledge of the plant.

Lightning Jp15 Protection against lightning involves installation of a surge protection device between each non-earth bonded core of the cable and the local structure.