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BEST PRACTICES FOR NOISE CONTROL

BEST PRACTICES FOR NOISE CONTROL. LONGWALL COMMITTEE. Bill Knepp - Chairman Greg Fetty - District 3 Jason Rinehart - District 3 Raymond Browning - District 4 Larry Worrell - District 5 Kirby Webb - District 8 Mark Eslinger - District 8 David Elkins - District 9

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BEST PRACTICES FOR NOISE CONTROL

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  1. BEST PRACTICES FOR NOISE CONTROL LONGWALL COMMITTEE

  2. Bill Knepp - Chairman Greg Fetty - District 3 Jason Rinehart - District 3 Raymond Browning - District 4 Larry Worrell - District 5 Kirby Webb - District 8 Mark Eslinger - District 8 David Elkins - District 9 Robert Smith - District 10 John Craddock - District 11 Committee Members

  3. Nationwide Effort

  4. Longwall Noise Data thru August 2000

  5. HIGH EXPOSURE TASKS(Based on Initial MSHA Full Shift Surveys)

  6. Shearer Stageloader Face Conveyor LONGWALL NOISE SOURCES

  7. LONGWALL SHEARER – Sound Levels (dBA) Direction of Cut Expected Levels Expected Levels 85 90 90 85 95 93.6 H 106.6 L 87.7 94.2 H 104 L 89.3 94.7 H 101.6 L 91.4 96 H 102 L 91.3 98.2 H 108.8 L 93.2 36 ft. From Trailing Drum 36 ft From Leading Drum AVERAGE LEVELS -LONGWALL SHEARING MACHINE BASED ON 20 SURVEYS

  8. Noise data obtained when a shearer is cutting coal.

  9. Engineering Noise Barrier Between the Source and Miners Memory Cut Monitoring via Video Camera Administrative Worker Rotation Worker Positioning SHEARER NOISE CONTROL

  10. STAGELOADER AREA

  11. Emulsion Pumps 98 H: 100 L: 97 STAGELOADER AND AFC TYPICAL NOISE LEVELS Stageloader Drive 95.6 H: 99.3 L: 92 Crusher 93.8 H: 94.4 L: 91.9 Face Side AFC Drive 96.2 H: 103.8 L: 92.3 Conveyor Empty 82 H: 88.5 L: 72* Conveyor Loaded 81.5 H: 85.0 Gob Side AFC Drive 93 H: 98.1 L: 87.7 TYPICALLY EXPECTED NOISE LEVELS - STAGE LOADER, CRUSHER AREA, DRIVE MOTORS

  12. Crusher Unit (Height of Crusher Drum) Stageloader Discharge (Covered End) Damping of Motors, Panels, Gear Units, etc. Operator Isolation by Enclosure or Barriers Motors (Water Cooled/Location) Conveyor Chain Tensioning Remote Location Through Optics and Readouts STAGELOADER NOISE CONTROL

  13. 85 dBA average on pan line Machined pan lines 72dBA empty Machined pan lines 78 dBA loaded Proper tensioning of chain Proper flight spacing Face Conveyor

  14. Typical placement of belting for dust control purposes. Extending this belting higher will lower noise exposures as well as complement the shearer clearer system (94dBA vs 98dBA).

  15. REDUCING NOISE LEVELS BY POSITIONING OPERATORS OUTBY THE CUTTING DRUMS DIRECTION OF CUT 93.6 94.2 94.7 96 98.2 85 90 95 85 10 dBA Reduction 36 ft From the Cutting Drum 5 dBA Reduction 25 ft From the Cutting Drum

  16. Initial survey results Head Shearer 184% Tail Shearer 347% Employees were repositioned outby cutting drums Head Shearer 98% Tail Shearer 167% Effects on Respirable Dust not Verified EMPLOYEE POSITIONING

  17. 114% dose on tail shearer 66% dose on head shearer 23% dose on headgate operator ROTATION OF EMPLOYEES

  18. 96% dose on tail shearer 102% dose on head shearer 85% dose on headgate operator MEMORY CUT

  19. Headgate Shearer Operator - 134% Stageloader Operator - 170% Tailgate Shearer Operator - 353% Shield Setter - 110% New LS7 Joy Shearer on the way Camp 11 Survey Ran February 15, 2001

  20. Crusher Motor Covered With Belting

  21. Head Drive Motor Covered With Belting

  22. Sound absorbent material placed between the frame and cover of the stage loader.

  23. End Framework Unit 107 105.4 Beam Module 110.4 106.6 Concave Module 109 107.3 Crusher 109 108 Swivel/Surge Pans 110 109 Coal Age Stageloader Rebuild Before and After dBA readings Readings taken in a repair shop; a steel building with a concrete floor.

  24. Proper tensioning of conveyor flights Covering of the discharge area with belting Shorten drag chains STAGELOADER DISCHARGE

  25. CRUSHER MOTOR

  26. Fiber Glass Frame With Sound Absorbing Material 100 ft X 50 inch roll - $300 Used Over Motors and Gearboxes Before and After Readings Along Stageloader 10 ft Outby Face 97 - 95 At Corner 98 - 92 Shield No. 2 106 - 93 Shield No. 3 103 - 92 Shield No. 4 102 - 90 Shield No. 5 94 - 87 The “Bubble”

  27. - Stageloader “Bubble”6 dBA reduction Verfication and Applicability (Spring 2001) Camp 11 - Damping Efforts Damping of stageloader JANA Controls and new LS 7 Shearer Follow Up With Time Motion Study (04/2001) Powhaten 6 Insulating Foam with Plate Covering Before and After Positioning of Motors to Off Side (03/2001) FUTURE PLANS AND FOLLOW UP’S

  28. FUTURE PLANS AND FOLLOW UP’S • Deer Creek (Spring/ Summer 2001) • Verify Compliance • Sound Damping Blankets - 4 to9 dBA • 4 x 8 ft. model QBS-1 $240 • Gear box at dump end of stageloader • Skyline (Spring/ Summer 2001) • Further Verify Compliance • Blankets hung around head and tail drives • Gary 50 (Spring 2001) • Horizon Control Technology • New Longwalls • San Juan South (2002)

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