Explosive atmosphere

Certain types of equipment are specifically excluded from the scope of the directive. It is self-evident that equipment which is already regulated at Union level with respect to the pressure risk by other directives had to be excluded. That is the case with simple pressure vessels, transportable pressure equipment, aerosols and motor vehicles. Other equipment, such as carbonated drink containers or radiators and piping for hot water systems are excluded from the scope because of the limited risk involved. Also excluded are products which are subject to a minor pressure risk which are covered by the directives on machinery, lifts, low voltage, medical devices, gas appliances and on explosive atmospheres. A further and last group of exclusions refers to equipment which presents a significant pressure risk, but for which neither the free circulation aspect nor the safety aspect necessitated their inclusion. [Pg.941]

Generally, it is more economical to prevent explosive atmospheres ia rooms than to try to provide explosion-proof electrical equipment. Personnel should never be allowed to work ia a ha2ardous atmosphere. Where such an atmosphere cannot be avoided through control of flammable Hquids, gases, and dusts, access to the area iavolved should be limited and the area segregated by hoods or special ventilation. Electrical equipment on open, outdoor stmctures more than 8 m above-ground usually is considered free from exposure to more than temporary, local explosive mixtures near leaks (86). [Pg.98]

Measures which prevent or restrict formation of a hazardous, explosible atmosphere... [Pg.2323]

BS 5345. General Recommendations—Code of Practice for Selection, Installation and Maintenance of Electrical Apparatus for Use in Potentially Explosive Atmospheres. BSI, U.K. [Pg.145]

In India, the Central Mining Research Institute, Dhanbad carries out this testing and provides the necessary certilication for motors used iti explosive atmospheres. But for approval of the equipment, whether it is worthy of use in a particitlar hazardous area, there are accredited agencies.. Some of these are Directorate General Mines Safety. Dhanbad, Chief Controller of Explosives. Nagpur and Directorate General of Factory Advice Service and Labour Institute. Bonibav. [Pg.183]

The Chemical Times. Design and application of electric motors in explosive atmosphere , IV, No. 15, April (1977). [Pg.194]

It is especially important for the JP-4 type products since they produce a typical explosive atmosphere at ambient temperatures above the liquid level. [Pg.277]

Preeautions also have to be instituted to proteet against the inherent properties of the eylinder eontents, e.g. toxie, eorrosive, flammable (refer to Table 9.1). Most gases are denser than air eommon exeeptions inelude aeetylene, ammonia, helium, hydrogen and methane. Even these may on eseape be mueh eooler than ambient air and therefore slump initially. Eventually the gas will rise and aeeumulate at high levels unless ventilated. Hydrogen and aeetylene, whieh both have very wide flammable limits (Table 6.1), ean form explosive atmospheres in this way. [Pg.265]

Switch should not constitute a fire risk in an explosive atmosphere and be capable of opening whilst engine is running, without causing any dangerous excess voltage... [Pg.466]

HS(Gj22 Electrical apparatus for use in potentially explosive atmospheres... [Pg.575]

HS(Rjl5 Administrative guidance on the European Community Explosive Atmospheres Directives (76/... [Pg.577]

Withdrawn) 1989 AMD 3 Code of practice for selection, installation and maintenance of electncal apparatus for use m potentially explosive atmospheres (other than mining applications or explosives processing and manufacture). Part 1 General recommendations (AMD 7871) dated 15 September 1993. Withdrawn, superseded by BS EN 60079-14 1997 (Withdrawn) 1978 AMD 1 Code of practice for selection, installation and maintenance of electncal apparatus for use m potentially explosive atmospheres (other than mining applications or explosives processing and manufacture). Part 6 Recommendations for type of protection. Increased safety (AMD 5557) dated 30 November 1989. Withdrawn, superseded by BS EN 60079... [Pg.588]

Electrical apparatus for explosive atmospheres with type of protection N. Superseded by BS EN 50021 1999 but remains cuiTcnt... [Pg.589]

AMD 2 Electrical apparatus for potentially explosive atmospheres - General requirements (AMD 10552J dated August 1999. Partially superseded BS EN 50014 1993 which remains cuiTcnt... [Pg.591]

AMD 1 Electrical apparatus for potentially explosive atmospheres- Intrinsic safety i (AMD 10040J dated June 1998. Read with BS EN 50014 1993... [Pg.591]

BS5501 Electrical apparatus for potentially explosive atmospheres. [Pg.373]

Prevent liquid entering sewers, basements and workpits, vapour may create explosive atmosphere Warn inhabitants - explosion hazard... [Pg.465]

Electrical apparatus for potentiahy explosive atmospheres - Powder filling q . Superseded BS EN 50017 1994 which remains current... [Pg.591]

The fluoro compound is resistant to nitration and an operating temperature of 90°C is necessary to ensure formation of the 5-nitro derivative. Under these conditions, the atmosphere (containing the fluoro compound, its nitro derivative and nitric acid vapours) in the nitration vessel is explosive and above the flash point. An unknown ignition source led to an explosion and rupture of the 3 cu. m vessel, and a maximum explosion pressure of 50 bar was confirmed experimentally. Such explosive atmospheres are not found in low temperature nitration reactions. [Pg.1575]

In a plant for the continuous nitration of chlorobenzene, maloperation during startup caused the addition of substantial amounts of reactants into the reactor before effective agitation and mixing had been established. The normal reaction temperature of 60°C was rapidly exceeded by at least 60° and an explosion occurred. Subsequent investigation showed that at 80° C an explosive atmosphere was formed above the reaction mixture, and that the adiabatic vapour-phase nitration would attain a temperature of 700° C and ignite the explosive atmosphere in the reactor. See l,3-Bis(trifluoromethyl)benzene, above... [Pg.1576]

Evolution of hydrogen, attributed to presence of aluminium particles, formed an explosive atmosphere over wetted incinerator residues. [Pg.1623]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...