Zone system for classification of hazardous areas. The flash point of a flammable liquid is the lowest temperature at which a sufficient quantity of vapor will arise to permit ignition under laboratory conditions. This is an important factor in the classification of hazardous areas. Flammable liquids with a high flash point are less hazardous than liquids with a low flash point.

System has been used for decades as the basis for area classification of hazardous ( classified ) locations.

The following chart illustrates the differences between the various Zones. Hazardous – Area Classification Methods and Equipment. Wayne Ulanski, SVF Flow Controls, Inc. Zone – An atmosphere where a mixture of air and flammable substances in the form of gas, vapor or mist is present frequently, continuously or for long periods. Area in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation, but if it does occur, will persist for a short period only.

Gases, vapours, mists and dusts can all form explosive atmospheres with air. North American hazardous locations classification in classes, divisions and groups.

Electrical equipment can cause explosions in certain atmospheres. Equipment used in areas where explosive concentrations of dusts or vapors may exist must be equipped with special wiring and other electrical components for safety purposes. Note 2: For associated intrinsically safe apparatus not suitable for installation in a hazardous location, both the symbol “Ex” or “AEx” and the symbol for. CA classification per CSAC22. CLASSIFICATIONS : What You Need To Know.

During the evening of February. Imperial Sugar manufacturing facility in Port Wentworth, Georgia, just outside of Savannah, resulted in the deaths of fourteen workers and numerous injuries. According to Georgia Fire . Guide to Equipment Certification Requiremen. The two Directives concerned with hazardous areas are called the ATEX and ATEX 137. The names are related to articles and 1of the EC treaty.

By definition, a hazardous ( classified ) location is an area in an industrial complex where the atmosphere. World standards for the classification of hazardous areas are moving toward harmonization. Note: the temperatures given in °C.

No arcs, sparks or hot surfaces.

Name of notified body performing. Class I, Division Groups AB T4. NEC) in which flammable or explosive gases, liquids, or dusts may be present. These explosive agents may be present at all times, only during abnormal operations, or only when components or. Pre-start health and safety.

Locating an engineer to perform area classification. An explosive atmosphere exists where a mixture of. Necessary Marking for the Equipment mixture of the flammable. Explosion Protection Standard.

Technical Guides and Wallcharts. Below you will find links to the three Wallcharts and other Guidance Documents in support of our hazardous atmosphere services. Group I : Equipment has a representative gas of Methane and all .