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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Have appropriate standards been used for selection of equipment in hazardous areas? HSE aims to reduce work-related death, injury and ill health. Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: However, for many years we have used a small-scale screening test, the vertical tube test, described in HSG 2.
HS G 2 Formula for health and safety: This website uses non-intrusive cookies to improve your user experience. Any such processes should hazaddous specifically identified in a safety case. An area in which an explosive gas atmosphere is present continuously or for long periods; Zone 1: It describes requirements for “Category 3” equipment. 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.
Site rules should be clear where normal road vehicles may be taken, and areas where they must be excluded. The conclusions from this are will be made available in due course.
Level Definition In Hazardous Area Classification Ip15
Further parts of this standard are well advanced and will appear during 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. 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? Section 9 provides guidance on lightning protection of structures with inherent explosive risks.
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.
Electric powered vehicles can also be built using a combination of this standard and the normal electrical standards. The use of BS EN Paragraphs 35 to 39 describe the requirements for hazardous area classification.
It contains much useful advice about limiting pumping speeds, electrostatic risks from clothing, and many detailed operations. New mechanical equipment will need to be selected in the same way.
Further guidance can be found in BS 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 substance.
These should now be seen as rather conservative. These will include electrical circuits; the inlet and exhaust of any internal combustion engine; electrostatic build up; overheating brakes, and other moving parts. Hazardous Area Classification and Control of Ignition Sources This Technical Measures Document refers to the classification of plant into hazardous areas, and the systematic identification and control of ignition sources The relevant Level 2 Criteria are 5.
The IP code is for use by refinery and petrochemical type operations. The explosibility of dusts is dependent upon a number of factors: This was a study led cllassification a consortium of the chemical, electrical and mechanical engineering institutes, and showed how the subject spanned the traditional divides.
Commonly these will be grouped for the purposes of any area classification study. Basic concepts and methodology.
You can visit our cookie privacy page for more information. The only classirication standard to help people zone their plant is BS EN part 3, 1which is an adaptation of the IEC equivalent.
Is this page useful? These factors enable appropriate selection of zone type srea zone extent, and also of equipment. Ignition due to a hot surface is possible, but the temperature needed to ignite a dust layer depends on layer thickness and contact time. Appendix 2 describes the requirements for hazardous area classification.
Hazardous Area Classification and Control of Ignition Sources
For most chemical products it is preferable to test dust taken from the hazardois, but if the particle size distribution varies, it is classificatino to test material that passes a micron sieve, and take this as the worst case. The IP code considers specifically the issue of hydrogen containing process streams as commonly found on refinery plants.
These, the standard current in midand the letter giving the type of protection are listed below. HS G 71 2 Chemical warehousing: Contains useful information about electrostatic hazards during unloading. The most common values used are: LPGA codes have not previously drawn a clear distinction between hazardous areas, and separation distances required for other reasons.
Non-electrical equipment The first standard for explosion protected non-electrical equipment is BS EN part 1 1. The most common values used are:. Appendix 3 describes the requirements for hazardous area classification.