Basic knowledges about intrinsically safe explosion-proof ATEX smartphone in petrochemical plants
Explosive environment: an environment (gas and dust) that may explode. Any place involving the production, processing, handling, storage, and transportation of explosive substances may form an explosive environment.
• Hazardous location: an area where a large number of explosive atmospheres or expected occurrences are sufficient to require special precautions for the structure, installation and use of electrical equipment.
• In the production areas of petroleum, chemical industry, coal, etc., the leakage of explosive substances will inevitably occur, and form explosive dangerous places with the air. According to information:
-In coal mines, 2/3 of the places are explosive and dangerous places;
-About 60-80% of oil production sites and refineries are explosive and hazardous locations;
-In the chemical industry, more than 80% of production workshops are explosive and hazardous locations.
• explosive substances into three categories:
Class I: Mine methane;
Class II: Explosive gas mixture (including vapor and mist);
Class III: Explosive dust and fibers.
• North America divides explosive substances into three categories (classes). they are, respectively:
Class I-explosive gas;
Class II-explosive dust;
Class III-explosive fiber.
ATEX explosion-proof smartphone The main standard basis for the division of explosion hazardous areas
-GB50058-1992 Code for design of electrical installations in explosive and fire hazardous environments
-GB3836.14-2000 Electrical Equipment for Explosive Gas Atmosphere Part 14 Classification of Hazardous Locations
• Explosive hazardous areas are mainly classified based on the frequency and duration of explosive hazardous substances.
Like the IEC standard, there are 3 zones for explosive gas hazardous locations, namely zone 0, zone 1 and zone 2. Their corresponding definitions are as follows:
Zone 0: Under normal circumstances, an explosive gas mixture exists continuously or for a long period of time. (Above 1000h/y) (1 y = 8760 h)
Zone 1: Under normal circumstances, a place where explosive gas mixtures may occur. (10-1000h/y)
Zone 2: Under normal circumstances, explosive gas mixtures are unlikely to occur, or even if they occur, they are only a place for a short time. (Below 10h/y)
Safe place: Less than 1h/y.
ATEX explosion proof smartphone can be used in zone 1 and zone 2.