Design and Fabrication of Instrumentation for Remote Sealing of Underground Coal Mine Passageways.
Monaghan-DA; Berry-DR; Brunelle-BC
NTIS: PB 295-292 :78 pages
This report describes instrumentation that is part of a system for extinguishing mine fires by pumping material through surface boreholes to seal off all underground passageways leading to the fire area. Major instrumentation systems include a closed-circuit television (cctv) probing system and an acoustic seal checking system. The latter consists of a speaker probe, a receiver probe, and related signal processing equipment. All probes can be winch- deployed down a 6-inch-diameter borehole. The cctv unit can be rotated 360 deg in the horizontal plane, and contains sufficient lighting to reliably assay conditions for sealing or rescue within a 200-foot radius. The acoustic seal checker monitors the completion of a seal as it progresses by use probes lowered through boreholes on either side of the seal.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 295-292
Foster-Miller Associates, Inc.