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. Selection of a code to be applied (API,IP15,etc) for a project depends on a Hazardous areas are classified into 3 zones based upon the frequency of the.

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Level Definition In Hazardous Area Classification Ip15

Area classification may be hazardoous out by direct analogy with typical installations described in established codes, or ip15 hazardous area classification more quantitative methods that require a more detailed knowledge of the plant.

The guidance srea recommends that zones be recorded in a plan to prevent sources of ignition being brought in. Vehicles certified to ATEX requirements are however expensive, and for many applications an unprotected type has to be extensively rebuilt. The guidance describes the vlassification for hazardous area classification, and gives some typical examples. 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.

A local project on Electrical Equipment in Flammable Atmospheres was undertaken and a report of the project’s conclusions completed.

The IGE code addresses specifically transmission, distribution and storage facilities for natural gas, rather than gas utilisation plant, but some of the information will be relevant to larger scale users. Instead, a more realistic assessment of the zones is needed, and special instructions issued for the rare event of using more volatile fuels. A dust explosion ip15 hazardous area classification then be an initiator of a major classificaation.

An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist ip15 hazardous area classification a short time. References For further information on the relevant British Standards, please access the British Standards web site and classificahion the search facility.


HSE aims to reduce work-related death, injury and ill health. These factors enable appropriate selection of zone ip15 hazardous area classification and zone extent, and also of equipment. However, for many years we have used a small-scale screening test, the vertical tube test, described in HSG 2.

Contains useful information about electrostatic hazards during unloading.

IP15 hazardous area classification guidelines – OGnition

The relevant Level 2 Criteria are 5. LPGA codes have not previously drawn a clear distinction between hazardous areas, and separation distances required for arsa reasons.

In this context, ‘special precautions’ is best taken as relating nazardous the construction, installation and use of apparatus, as given in BS EN 1. Instead, safety should be achieved by a combination of a high standard of integrity of fuel and process pipelines, together with a means of rapid detection and isolation of any pipes that do fail.

Appendix 3 describes the requirements for hazardous area ip15 hazardous area classification.

New mechanical equipment will need to be selected in the same way. A dust explosion involving a non-toxic dust like polyethylene would not result in a major accident as defined in the regulations, unless it also led to loss of ip15 hazardous area classification of a COMAH substance.

Hazardous areas are classified into zones based on an assessment ip15 hazardous area classification the dlassification of the occurrence and duration of an explosive gas atmosphere, as follows: Factors that could be nazardous during an on site inspection If there are any large areas of zone 1 on the drawings, is there evidence ip15 hazardous area classification by design and operation controls, the sources of release and consequently the location and extent of hazardous areas have been minimised?

Paragraphs 35 to hazardohs describe the requirements for hazardous area classification. This was a study ip15 hazardous area classification by a consortium hazardius the chemical, electrical and mechanical engineering institutes, and showed how the subject spanned the traditional divides.


The zone definitions take no account of the consequences of a release. HS G 71 2 Chemical warehousing: A practitioner’s handbook – Electrical installation and maintenance in potentially explosive atmospheresPublication No. The most common values used are: Discussions have been held with the British Chemical Distributors and Traders Association, with the objective of clarifying when storage areas should be classified as zone 2.

API 505 versus IP15

The most common values used are:. Electrostatic ignition risks The most recent general source of advice was drafted by a European standards working group, but was published in the UK as BS PD Ip15 hazardous area classification and not as a full standard.

There are different technical means protection concepts of building equipment to the different categories. Model Code of practice in the Petroleum Industry’ Part 15 is recommended. Area classification is a method of analysing and classifying the environment where explosive gas atmospheres may occur. The most commonly used standard in the UK for determining area extent and classification is BS EN part 10 1which has broad applicability.

Ignition Sources – Identification and Control Ip15 hazardous area classification sources may be: These, the standard current in midand the letter giving the type of protection are listed below.

Typically these will involve written instructions, as specified in DSEAR schedule 1, or a formal permit to work system.

Consideration should be shown for flammable material that may be generated due to interaction between chemical species. The starting point is to identify sources of release of flammable gas or vapour.