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Behavior of water gel permissibles in coal mines.
Ribovich J; Watson RW
XVIII International Conference of Scientific Research in the Field of Safety at Work in the Mining Industry, October 7-14, 1979, Dubrovnik, Yugoslavia. 1979 Oct; 2:187-192
Since their introduction in 1970, over 22.7 million kilograms of water gel permissibles have been successfully used in mining underground coal; annual sales are now approaching 9.1 million kilograms. A careful surveillance of their use has shown that there are no fundamental safety problems that could inhibit their continued application. However, this is not to say that room for further improvements does not exist. The elimination of the metal ties used in packaging water gels would enhance their safety; formulation with improved low-temperature sensitivity should also be sought in order to eliminate the possibilities of misfires in cold weather. The problem of dynamic desensitization may be more difficult to overcome, and more fundamental work in the mechanisms of sensitization may be required to solve this problem. While the safety of water gel permissibles in coal dust and methane atmospheres has been demonstrated to be equivalent to that of the current nitroglycerin-sensitized permissibles (the same tests are used in their approval), it is believed that further improvements in this area are also possible. The effect of chemical additives in reducing incendivity has only begun to be explored; ways of significantly increasing water content without reducing energy to unacceptably low levels might also lead to improved safety. Research in these areas should be encouraged, in order to assure that the second-generation water gels live up to their full safety potential.
Mining industry; Mining; Underground mines; Underground mining; Coal mines; Coal mining; Explosives
OP; Conference/Symposia Proceedings
XVIII International Conference of Scientific Research in the Field of Safety at Work in the Mining Industry, October 7-14, 1979, Dubrovnik, Yugoslavia
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division