Humidity and static electricity in pneumatic loading of blasting explosives / by J.A. Darling and D.A.B. Stevenson.: M34-20/59E-PDF

“The occasional generation of static electricity in ammonium nitrate jet loaders is a serious matter because of the potential hazard presented to the operating personnel through the premature ignition of the blasting caps and initiating devices resulting from the development and discharge of static electrical charges. Previous methods of control of these hazards have included the introduction of conductive hoses and the grounding of the metal injector of loaders. Electric blasting caps have been forbidden in bottom primed drill holes. In addition static proof safety fuses and detonating fuses have been developed. This work explores the possibility of controlling the generation of static electricity by additions of water or of water vapour generation to jet loaders. It has been discovered that this water vapour may be automatically provided by exposures of ammonium nitrate or ammonium nitrate-oil mixtures to an air stream of high relative humidity immediately prior to loading. This exposure limits, to safe values, the voltages produced in the ammonium nitrate-hose wall static electricity generating system that may be operating in a pneumatic loader"--Synopsis, p. i.

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