Francart 2007 Presentation

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Slide 1

Utilizing Belt Air to Ventilate Active Working Areas

Slide 2

Federal Coal Mine Health and Safety Act of 1969 Belt air couldn't be utilized to ventilate dynamic works aside from mines opened preceding the Act (Pre-Act Mines) Pre-Act mines could use belt air if necessary with endorsement

Slide 3

Petitions for Modification First Petition Granted 1975 30 CFR § 75.326 § 75.326 got to be § 75.350 in ensuing ventilation rulemaking Approximately 90 Petitions conceded from 1975 to 2003

Slide 4

Prior to Final Rule : Two approaches to utilize belt air Petition for Modification Pre-Act Mines still can utilize belt air with MSHA District Manager Approval

Slide 5

Final Belt Air Rule April 2, 2004 All conceded petitions are superseded Any Pre-Act mines should likewise consent to definite administer

Slide 6

Ventilation of Belt Conveyor Entries DW Mitchell and CW Parisi, 1988

Slide 7

Federal Coal Mine Health and Safety Act of 1969 Act depended on data and innovation accessible at the time Four research archives considered by Congress

Slide 8

Mine Fires and Their Control Westfield (1966) condensed information and experience from 572 fires 1952 to 1965 Three Discussion Points : Electrical short out insurance required Abandoning trolley haulage Limiting air ebb and flow in belt section Only third was viewed as down to earth and implementable by Congress in 1969

Slide 9

Float Dust Deposits in Return Airways in American Coal Mines USBM IC 8150 (1963) 50 mine Study indicated drift coal tidy levels saved in belt passages was seven times that of profits

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Float Coal Hazard in Mines : A Progress Report USBM RI 6581(1965) 50 mine study Higher speeds consequently aviation routes brought down centralization of buoy coal stores Float coal not raised into suspension via air speeds from 50 to 550 fpm

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Fire Hazard of Conveyor Belts USBM RI 7053(1967) Rubber-based belting copied 10 to 30 times speedier than different plans (proliferation) Flame spread was higher with air development in belt passage than zero-stream Small fires were smothered via programmed sprinklers

Slide 12

Air Velocity Act constrained air speed and amount to levels required to control methane gas and supply oxygen to men Intent in Act was to moderate against fanning and engendering fire, polluting mine entrances before escape, and buoy coal tidy

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Fire Detection Technology Heat actuated point-sort sensors (PTHS) were cutting edge in 1969 PTHS still acknowledged in 30 CFR for non-belt air mines Belt Air Rule requires utilization of Atmospheric Monitoring (CO) System or Equivalent AMS gives expanded recognition capacity and before notice to mineworkers

Slide 14

CONCLUSIONS BY MITCHELL Provisions giving a more noteworthy level of assurance to excavators include: Allowing belt sections to be utilized to supplement ventilation at working confronts Isolating belt section from essential escapeway Permitting air speeds reliable with safe mining hones

Slide 15

CONCLUSIONS BY MITCHELL Proposed cautioning and alert levels of 10 and 15 ppm CO above encompassing ought to be reexamined Concentration of CO depends on size of terminate and wind current in the section Belt Air lead decreased levels to 5 and 10 ppm CO, and take into account assist diminishments based of USBM RI 9380