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 main purpose is to facilitate the proper selection and installation of apparatus to be used safely in that environment, taking into account the properties of the flammable materials that will be xrea.

IP15 hazardous area classification guidelines – OGnition

European equipment standards may become ‘harmonised’ when a reference to them is published in the Official Journal of the European Community. This contains very limited information on hazardous area classification or control of ignition sources HS G 2 Safe handling of combustible dusts: DSEAR sets out the link between zones, and the hazrdous that may be installed in that zone. HSE aims to reduce work-related death, injury and ill health. This applies to new or newly modified installations.

Appendix 2 describes the requirements for hazardous area classification. 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 according to the table below: Where toxic dusts are handled, in most cases occupiers will need to carry out testing of the product for ip51 explosion properties.

Does the report identify old electrical equipment still in service in a hazardous area, and what assessment has been made to ensure it remains safe for use? Has ignition protected electrical equipment been installed and maintained by suitably trained staff. The IGE code addresses specifically transmission, distribution and storage facilities for natural gas, rather hazarodus gas utilisation plant, but some of the information will be relevant to larger scale users.

If several different flammable materials may be present within a particular area, the material that gives the highest classification dictates the overall area classification. 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. Further Reading Material Cox, A. The standards detailing selection of appropriate electrical apparatus hazarous been updated to take into consideration ventilation effects.


Earthing of plant, drums and tankers is the most basic requirement; other precautions are described in the references What control measures over ignition sources are adopted in hazardous areas during maintenance; where ignition sources must be introduced, typical precautions include the use of supplementary ventilation, portable gas detectors, and inerting of sections of plant.

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

It contains much useful advice about limiting pumping speeds, electrostatic risks from clothing, and many detailed operations. This gives additional general advice on the many of the issues covered in this TMD. Safe systems of work are needed to ensure safety where such ‘transient’ zones exist.

Ignition due to a hot surface is possible, but the temperature needed to ignite a dust layer depends on layer thickness and contact time. 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. The relevant Level 2 Criteria are 5. LPGA codes have not previously drawn a clear distinction between hazardous areas, and separation distances required for other reasons.

Further parts of this standard are well advanced and will appear during Area classification is a method of analysing and classifying the environment where explosive gas atmospheres may occur.

Hazardous Area Classification and Control of Ignition Sources

DSEAR requires that hazardous area classification for flammable dusts should be undertaken in the same manner as that for flammable gases and vapours. Discussions are also ongoing, about vehicles with gas detection systems, designed to shut the engine and isolate other sources of ignition in the event of a gas release.

The only relevant standard to help people zone their plant is BS EN part 3, 1which is an adaptation of the IEC equivalent. These will include electrical circuits; the inlet and exhaust of any internal combustion engine; electrostatic build up; overheating brakes, and other moving parts. 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”.

Level Definition In Hazardous Area Classification Ip15

The two parts are: Code of practice for protection of structures against lightning, British Standards Institution. This was a study led by a consortium of the chemical, electrical and mechanical engineering institutes, and showed how the subject spanned the traditional divides.


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 i15 a full standard. 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 containment of a COMAH cassification. Skip to content Skip to navigation. Site rules should be clear where normal road vehicles may be taken, and areas where they must be excluded.

The option of writing out an exception to normal instructions to allow a non Ex-protected machine to be used regularly is not recommended. Similarly the IGE code gives a methodology for natural gas, relating the leak rate to the hole-size and arfa operating pressure. Other processes such as hot oil heating circuits may handle products above their auto-ignition temperature.

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

The most common values used are: The different parts of this standard set out hazarddous for construction of equipment for use in atmospheres containing explosive dusts; information about selection and maintenance; and BS EN It tabulates values for an LPG mixture, gasoline, natural gas, and refinery hydrogen for pressures up to barg.

DSEAR specifically extends the original scope of this analysis, to take into lcassification non-electrical sources of ignition, and mobile equipment that creates an ignition risk.

Hazardous Area Classification and Control of Ignition Sources

Companies able to undertaken such testing are listed in the IChemE’s book on the prevention of dust explosions. Institute of Petroleum Model Code of Safe Practice, part 15, area classification for installations handling flammable fluids, 2nd edition Electric powered vehicles can also be built using a combination haardous this standard and the normal electrical standards.

Where people wish to quantify the zone definitions, these values are the most appropriate, but for the majority of situations hazatdous purely qualitative approach is adequate. Explosion prevention and protection.

The zone definitions take no account of the consequences of a release.