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Control of Airborne Respirable Dust Hazards: A Training Program for Underground Coal Miners

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Title: Control of Airborne Respirable Dust Hazards: A Training Program for Underground Coal Miners


1
Control of Airborne Respirable Dust HazardsA
Training Program for Underground Coal Miners
Penn State
The Penn State Miner Training
Program University Park, PA 16802 Raja V.
Ramani, Ph.D., P.E, C.M.S.P. Mark C. Radomsky,
Ph.D. MPA, C.M.S.P. Joseph P. Flick, M.S.,
C.M.S.P.
March 31, 2003
2
CENTERS FOR DISEASE CONTROL AND PREVENTION
NATIONAL INSTITUTE FOR OCUPATIONAL SAFETY AND
HEALTH
GENERIC MINERAL TECHNOLOGY CENTER ON RESPIRABLE
DUST
PENNSYLVANIA BUREAU OF DEEP MINE SAFETY
3
RESPIRABLE DUST TRAINING PROGRAM
  • Section 10
  • DUST CONTROL PLAN

4
Dust Control Plan
  • In modern longwall and continuous miner sections,
  • a combination of engineering, administrative and
    personal protective equipment controls are used
  • to reduce ambient concentration and personal
    exposures.
  • Under the Mine Act, for every mining operation,
  • a Ventilation Plan must be submitted to and
    approved by the MSHA District Manager. Dust
    Control Plan is a portion of the Ventilation
    Plan. The Dust Control Plan is approved on a
    mine-by-mine basis.30 CFR 71.301

5
The Dust Control Plan is the
explicit description of the
strategies i.e. the respirable dust control
measures that the mining operation would follow
to control the ambient dust levels and reduce the
worker exposure. 30 CFR 71.300
6
Elements of Dust Control Plan
  • The dust control plan provides the details of the
    engineering, administrative and personal
    protective devices to be implemented to keep
    ambient concentrations and exposures below
    mandated levels
  • The dust control plan identifies the sampling
    locations for dust monitoring purposes

7
An Example Of A Longwall Dust Control Plan
  1. The Shearer Spray System Specifications Details
    of Drum Sprays and Other Sprays such as
    Shearer-Clearer including Types of Sprays, Number
    of Sprays, Pressure, and Minimum Number Operating
  2. The Description of the Remote Control Operation
    of the Shearer
  3. Specifications of the Spray Supply System
    Booster Pump, Supply lines, Pressures and
    Quantities at Various Points
  4. Stageloader Dust Control System including the
    Enclosures and Details of the Sprays

8
Longwall Dust Control Plan Continued
  • Shield Dust Control System The Frequency for the
    Wash Down of the Shields, Hosing Down of the
    Shield Tips, and any Special Provisions for the
    Headgate and Tailgate Shields.
  • Operational Provisions to Reduce Exposure
    Shearer Cutting Sequence, The Locations of the
    Shearer and Shield Operators, Maximum Amount of
    Time Personnel Downwind of the Shearer or the
    Shield when Operating.

9
Longwall Dust Control Plan Continued
  • Ventilation Controls Specifications of the
    Quantity and Velocity of Air at Selected
    Locations in the Face Use of Gob Curtain and
    Wing Curtain Air Splitting Barriers on the
    Shearer Use of Belt Air.
  • Other Dust Control Provisions, if any, such as
    Water Infusion, Wetting Agents, Intake Air Dust
    Control, Roadway Dust Control.

10
Longwall Dust Control Plan Continued
  1. Respiratory Protection Provisions and
    Requirements for the Use of Respirators. Use of
    Personal Protection Equipment such as Powered Air
    Purifying Respirator PAPR by shearer operator
    or by all miners when working downwind of the
    Shearer
  2. Any other detail as necessary to fully illustrate
    the dust control plan

11
Longwall Ventilation Plan (Mine A)
  1. Q at face intake 39,000 cfm
  2. V at shield 15 350 fpm (lt 100 ft. from head
    gate)
  3. V at shield 110 350 fpm (lt100 ft. from tail
    gate)

12
Longwall Ventilation Plan (Mine A)
  1. Shearer Sprays

Location Type Flow/Mode Pressure
Headgate Drum 44 Whirljet sprays 0.7 gpm/spray 120 psi
Tailgate Drum 44 Whirljet sprays 0.7 gpm/spray 120 psi
Body 8 Venturi sprays 0.8 gpm/spray 200 psi
HG spray arm 6 Hollow cone 0.36 gpm/spray 200 psi
TG spray arm 6 Hollow cone 0.36 gpm/spray 200 psi
13
Longwall Ventilation Plan (Mine A)
  1. (Continued) Stage loader/Crusher Sprays
    all enclosed

Location Flow/Mode Pressure
Crusher 4
Discharge 4
Total 8 1.1 gpm/spray 200 psi
14
Longwall Ventilation Plan (Mine A)
  1. BiDi or UniDi Various operational schemes.
    Exposure of shield operators will be minimized in
    BiDi.
  2. Radio remote control of shearer. Shearer operator
    upwind.
  3. PPE (respirator or air helmets) are mandatory on
    the face when downwind of the shearer
  4. A constant pressure pump in the longwall water
    supply circuit to ensure water pressure. Water
    consumption (sprays) 81 gpm

15
Dust Control Checklist
16
Longwall Summary
17
An Example of a Continuous Mining Dust Control
Plan
  1. Continuous Miner Dust Control Location, type and
    number of sprays, pressure and quantity of water
    flow machine-mounted scrubbers
  2. Provision of Hoses Wash down hoses, sprinkler
    hoses
  3. Roof Bolter Dust Control Dust collection system
    operation and maintenance
  4. Sprays on belt lines

18
An Example of a Continuous Mining Dust Control
Plan Continued
  • Ventilation Controls
  • Single or dual-split ventilation
  • Air quantity in the face
  • Face ventilation system line curtain or tubing
  • Belt ventilation
  • Float Dust Control
  • Cleaning of Dust Accumulations

19
Proceed to Section 11 Coal Mine Dust Sampling
Procedures
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