Firedamp

When we consider sources of methane we have to add old methane methane that was formed millions of years ago but became trapped beneath the earth s surface to the new methane just de scribed Firedamp an explosion hazard to miners oc curs in layers of coal and is mostly methane Petroleum deposits formed by microbial decomposi tion of plant material under anaerobic conditions are always accompanied by pockets of natural gas which IS mostly methane... [Pg.66]

Maximum Charge (Charge Umite in Fr) is the max charge of an expl that can be fired in a coal mine without causing ignition of firedamp and/or coal dust in air Ref Marshall 2, 585 (1917)... [Pg.65]

Permissible or Permitted Explosives. In many coal mines there is a continual evolution of methane (firedamp) into the air of the workings. [Pg.659]

The particular hazard of firedamp ignition relates to the circumstance when a hole fired early in the round breaks the coal at another hole and exposes the explosive before it detonates. This is simulated by firing gallery tests similar to those described above, but with inverse initiation of a... [Pg.87]

Vapor Mixtures Frequently, flammability data are required for vapor mixtures. The flammability limits for the mixture are estimated by using LeChatelier s rule [LeChatelier, Estimation of Firedamp by Flammability Limits, Ann. Mines (1891), ser. 8, 19 388-395, with translation in Process Safety Progress, 23(3) 172]. [Pg.8]

Alexandre-Emile Beguyer de Chan-courtois, 1820-1886. Inspector-general of mines and professor of geology at the Ecole Sup neure des Mines in Paris He made geological explorations m France, Asia Minor, Iceland, and Greenland. As a humanitarian reform to prevent accidents from firedamp, he compelled mine owners to sink two shafts for each coal mine His most important contribution to chemistry was his spiral periodic arrangement of the elements Courtesy Mme. Jean Presne and the Ecole Sup6rieure des Mines, Pans... [Pg.656]

As was already mentioned, V.A. Mikhel son developed a theory of combustion of firedamp which was briefly described by Baum et al (Ref 13, pp 385-87)... [Pg.158]

Its expins, especially in mixtures with firedamp, are discussed on pp C360-R to C367-R under "Coal Mines Explosions and Fires , where numerous refs are given... [Pg.253]

Baum et al (Ref 8, pp 242-44) showed how the above equation is derived from Abel equation of state, thermodynamic laws 8t Hugoniot equation for ideal gases. They also presented a curve of density-deton velocity relationship for firedamp gas. The curve is nearly a straight line... [Pg.643]

When used in permitted expls Cu tube must be used because A1 might ignite and its flame will cause firedamp explosion... [Pg.738]

Heath and Frost patented in 1877 the use of a water-retaining paste such as soap 5, starch 0.5, glue 0.5 water 94% for tamping bore-holes, loaded with dynamite, in order to prevent the ignition of firedamp Ref Daniel (1902), 371... [Pg.59]

A Commission was appointed in France to investigate the problem of ignition of firedamp. In the report made in 1880, it admitted that there was then no explosive known that would not ignite fire-damp (called coal-... [Pg.141]

Suppression of firedamp and coal dust explosions, in high humidity coal mines, by stone dusting is affected by humidity. Agglomeration of moisture content of the dusting material influenced its effectiveness as explosion suppressor. Salt dusts become ineffective above 80% relative humidity because they dissolve (Ref 7)... [Pg.187]

Elementary Theory of Ignition 2) Ignition Cartridge 3) Ignition Compositions for use with Pyrotechnics 5) Ignition of Firedamp ... [Pg.275]

J. Taylor W. Young, 30, 4324 (1936) A complicated device suitable for igniting safety blasting explosives without igniting firedamp ... [Pg.281]

Two approaches are now used in attempts to prevent firedamp ignition by explosives. [Pg.285]

References, brief abstracts when available, to studies of firedamp and/or coal dust ignitions explosions, not listed in previous Encyclopedia Vols are given below ... [Pg.286]

H. G. Wolfhard M. Vanpee, Ignition of Fuel-Air Mixtures by Hot Gases and Its Relationship to Firedamp Explosions, pp 446-53 in 7th Symp Combstn (1959)... [Pg.286]

H. Kaffanke, Maitrise Degagement Grisouteux, Amelior Climat Mines, Journees Inform, (Luxembourg), 1971, 217 CA 76, 144547 (1972) prediction of firedamp emissions... [Pg.288]

H. Eicker, Ibid, 373 CA 76, 144544 (1972) maintenance of firedamp meters transmission of measured values... [Pg.288]

In this writer s opinion, Cook s values (Table 12.20 of Ref 18a) of TCJ are too high and his Pfj are too low the products probably contain more free carbon than shown. However, there is little doubt that most LOX detonations are hot , ie, they will readily ignite firedamp (Refs 2, 3, 12 14). Also the computed detonation velocities (estimated from Cook s PCj) show a much greater variation with compn and density than the experimental data of Table 3... [Pg.581]

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