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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The most commonly used standard in the UK for determining area extent and classification is BS EN part 10 1which has broad applicability. The two parts of the older BS An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time. An area in which an explosive gas atmosphere is present continuously or for long periods; Zone 1: Standards set out different hazardou concepts, with further subdivisions for some types of equipment according to gas group op15 temperature classification.

Where specialist vehicles e.

Factors for Assessor of a Safety Case to Consider Is a full set of plans identifying hazardous areas available? HSE aims to reduce work-related death, injury and ill health. A proposal was made to zone an aircraft hanger as Zone 1, although the use of fuels handled above their flash point would be a rare event.

Has ignition protected electrical equipment been installed and maintained by suitably trained staff. Where toxic dusts are handled, in most cases occupiers will need to carry out testing of the product for its explosion properties. For a large site they need not all be provided in the report, but those examples relevant to the representative set of major accidents upon which the ALARP demonstration is based must be included.

This contains very limited information on hazardous area classification or control of ignition sources HS G 2 Safe handling of combustible dusts: Instead, safety should be achieved by a combination of a high standard of integrity of fuel i;15 process pipelines, together with a means of rapid detection and isolation of any pipes that do fail. Basic concepts and methodology.


Most of the electrical standards have been developed over many years and are now set at international level, while standards for non-electrical equipment are only just becoming available from CEN.

Other processes such as hot oil heating circuits may handle products above their auto-ignition temperature. The starting point is to identify sources of release of flammable gas or vapour. Model Code of practice in the Petroleum Industry’ Part hazradous is recommended. Existing plant will not meet the formula in DSEAR, but older standards distinguished between electrical equipment suitable for zones 0, 1 and 2.

The results of this work should be documented in Hazardous Area Classification data sheets, supported by appropriate reference drawings showing the extent of the zones around including above and below where appropriate the plant item.

This gives additional general advice on the many of the issues covered in this TMD. Further guidance can be found in BS The guidance also recommends that zones be recorded in a plan to prevent sources of ignition being brought in.

It describes requirements for “Category 3” equipment. 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. This Technical Measures Document refers to the classification of plant into hazardous areas, and the systematic identification and control of ignition sources.

IP15 hazardous area classification guidelines – OGnition

A – switch to normal size A – switch to large size A – switch to larger size. These are currently under revision, and will specify hazardous areas, that in most cases will be smaller than the separation distance.

Basic concepts and methodology, British Standards Institution. The most recent general source of advice was drafted by a European standards working group, but was published in the UK as BS PD R and not as a full standard. It contains much useful hazarrous about limiting pumping speeds, electrostatic risks from clothing, and many detailed operations.


Many sites will have operations of filling and emptying road tankers with flammable materials. Equipment built to such a harmonised standard may assume automatic conformity with those essential safety requirements of relevant directives that are covered by the standard. Again, area classification is not a suitable means of controlling the ignition risks, and the same considerations apply, as with fired heaters. Do any zone 2 areas extend to places where the occupier has inadequate control over activities that could create an ignition source, or is there any suggestion that the zone boundaries have been arbitrarily adjusted to avoid this?

It proved difficult to obtain a floor-cleaning machine certified for Zone 1 areas, though the floor needed sweeping regularly. This website uses non-intrusive cookies to improve your user experience. Health and Safety Executive.

Level Definition In Hazardous Area Classification Ip15

Where occupiers choose to define extensive areas as Zone 1, the practical consequences could usefully be discussed during site inspection. This cross references BS EN The IP code is for use by refinery and petrochemical type operations. It was important in the development of ideas, but provides no new methodology for users.

Paragraphs 35 to 39 describe the requirements for hazardous area classification. The issues about representative samples of dust, and other factors that might cause the results to vary are also discussed in this guidance. The only relevant standard to help people zone their plant is BS EN part 3, 1which is an adaptation of the IEC equivalent.

Instead, a more realistic assessment of the zones is needed, and special instructions issued for the rare event of using more volatile fuels. The zone definitions take no account of the consequences of a release. Section 9 provides guidance on lightning protection of structures with inherent explosive ip155.