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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Electric powered vehicles can classiification be built using a combination of this standard and the normal electrical standards. When the hazardous areas of a plant have been classified, the remainder will be defined as non-hazardous, sometimes referred to as ‘safe areas’. Has ignition protected electrical equipment been installed and maintained by suitably trained staff.

Hazardous Area Classification and Control of Ignition Sources

This contains very limited information on hazardous area classification or control of ignition sources HS G 2 Safe handling of combustible dusts: These factors enable appropriate selection of zone type and zone extent, and also of equipment.

The two parts of the older BS If this aspect is important, it may be addressed by upgrading the specification of equipment or controls over activities allowed within the zone. 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?


Further parts of this standard are well advanced and will appear during A – switch to normal size A – switch to large size A – switch to larger size. Discussions have been held with the British Chemical Distributors and Traders Association, with the objective of clarifying when storage areas should be classified claswification zone 2.

The standards detailing selection of appropriate electrical apparatus have been updated to take into consideration ventilation effects. It was important in the development of ideas, but provides no new methodology for users. Using electrical equipment and instrumentation classified for the zone in which it is located. It tabulates values for an LPG mixture, gasoline, natural gas, and refinery hydrogen for pressures up to barg.


The most common values used are:. New mechanical equipment hazardkus need to be selected in the same way. Where people wish to quantify the zone definitions, these values are the classjfication appropriate, but for the majority of situations a purely qualitative approach is adequate.

Hazardous Area Classification and Control of Ignition Sources

Classiffication most commonly used standard in the UK for determining area extent and classification is BS EN part 10 1which has broad applicability. These, the standard current in midand the letter giving the type of protection are listed below. References For further information on the relevant British Standards, please access the British Standards web site and use the search facility.

Some reference to design codes, and commissioning checks to ensure the ventilation achieves the design aim, should be provided. Standards set out different protection concepts, with further subdivisions for some types of equipment according to gas group and temperature classification. Where toxic dusts are handled, in most cases occupiers will need to carry out testing of the product for its explosion properties. 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.

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 R and not as a full standard. Have appropriate standards been used for selection of equipment in hazardous areas? 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.

Catastrophic failures, such as vessel or line rupture are not considered by an area classification study. Section 9 provides guidance on lightning protection of structures with inherent explosive risks.


The IP code considers specifically the issue of hydrogen containing process streams as commonly found on refinery plants. There is no legally defined test for an explosible dust.

Level Definition In Hazardous Area Classification Ip15

Typically these will involve written instructions, as specified in DSEAR schedule 1, or a formal permit to work system. Where occupiers choose to define extensive areas as Zone 1, the practical consequences could usefully be discussed during site inspection.

Zoning Hazardous areas are defined in DSEAR as “any place in which an explosive atmosphere may occur in quantities such as to require special precautions to protect the safety of workers”. DSEAR specifically extends the original scope of clasxification analysis, classlfication take into account non-electrical sources of ignition, and mobile equipment that creates an ignition risk.

Correct selection of classiifcation equipment for hazardous areas requires the following information:. Classification of the hazardous area as in zones shown in the table above ; Temperature class or ignition temperature of the gas or vapour involved according to the table below: Where specialist vehicles e.

The relevant Level 2 Criteria are hazardoys. The option of writing out an exception to normal instructions to allow a non Ex-protected machine to be used regularly is not recommended.

IP15 hazardous area classification guidelines – OGnition

This website uses non-intrusive cookies to improve your user experience. Institute of Petroleum Model Code of Safe Practice, part 15, area classification for installations handling flammable fluids, 2nd edition Existing plant will not meet the formula in Haxardous, but older standards distinguished between electrical equipment suitable for zones 0, 1 and 2.

The different parts of this standard set out requirements for construction of equipment for use in atmospheres containing explosive dusts; information about selection and maintenance; and BS EN