Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1985-12-06
1987-08-18
Levy, Stewart J.
Measuring and testing
With fluid pressure
Porosity or permeability
73 407, G01N 1508, G01N 1908
Patent
active
046868496
ABSTRACT:
Mine roof competency is determined by injecting a pressurized gas into a borehole drilled in the roof of the mine and measuring the rate of pressure loss. A high rate of pressure loss is indicative of a dangerous mine roof. A tracer gas may also be injected into the borehole to determine the extent of cracks in the roof if a dangerous condition has been determined.
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Levy Stewart J.
Roskos Joseph W.
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