Results 11 - 20 of 28

• A Noise Control for A Roof Bolting Machine: Collapsible Drill Steel Enclosure
  7/1/2008 - Conference papers
  This paper describes and evaluates an engineering noise control for the roof bolting machine, namely the collapsible drill steel enclosure.
• Closing the Door to Dust When Adding Drill Steels: Uni-directional Cab Filtration and Pressurization System Tested
  10/1/2007 - Peer reviewed journal articles
  During a recent NIOSH field evaluation of a newly designed filtration and pressurization system for an enclosed cab of a surface drill, it was determined that the drill operator's respirable-dust exposure was significantly increased during time periods ...
• In-Cab Noise Reduction on an Air-Rotary Drill Rig
  5/1/2007 - Peer reviewed journal articles
  This paper summarizes a NIOSH investigation of engineering noise controls to reduce sound levels in cabs on air-rotary drill rigs. Results revealed that some drillers are exposed to A-weighted sound levels exceeding 85 dB even though a cab is used.
• Sound Power Level Study of a Roof Bolter
  1/1/2006 - Peer reviewed journal articles
  NIOSH initiated a study of a roof bolter to reduce noise exposure to mine roof bolter operators. When drilling into granite, it was found that wet drilling generated lower sound power levels and performed better than vacuum drilling.
• Reducing Enclosed Cab Drill Operator's Respirable Dust Exposure with Effective Filtration and Pressurization Techniques
  1/1/2005 - Peer reviewed journal articles
  Discusses a cooperative research effort to lower respirable dust levels in an enclosed cab on an older surface drill at a silica sand operation. A number of modifications were incorporated into the drill's filtration and pressurization system, as well a...
• Wearing Hearing Protection Properly: A 3-D Training Aid for Drillers
  11/1/2004 - Information Circulars
  This instructor's manual supplements the Wearing Hearing Protection Properly 3-D training reel. It offers tips on using the reel as a training aid, assessing training needs, and discussion notes that provide additional information to the user.
• Drill Monitor With Strata Strength Classification in Near-Real Time
  7/1/2002 - Reports of Investigations
  The process of drilling and bolting the roof is currently one of the most dangerous jobs in underground mining, resulting in about 1,000 accidents with injuries each year in the United States. Researchers from the Spokane Research Laboratory of the Nat...
• Reducing Enclosed Cab Drill Operator's Respirable Dust Exposure at Surface Coal Operation With a Retrofitted Filtration and Pressurization System
  2/1/2002 - Conference papers
  This report discusses a cooperative research study performed on a surface drill retrofitted with a new pressurization and filtration system. Respirable dust concentrations were substantially reduced from 0.64 mg/m3 during pre-testing to 0.05 mg/m3 duri...
• The Effects of Low Quartz Mass Loading and Spatial Variability on the Quartz Analysis of Surface Coal Mine Dust Samples
  9/1/2001 - Peer reviewed journal articles
  The objectives of this work are to 1) evaluate the performance of the P7 method on field samples of low quartz mass loadings, 2) evaluate the magnitude of dust mass spatial variability within an enclosed cab environment, and 3) estimate the subsequent p...
• Ignition Hazard From Internally-generated H2 in Sealed Mining Equipment
  7/1/2001 - Peer reviewed journal articles
  A number of ignition incidents involving mining and farm equipment have illustrated the surprising danger of drilling, cutting, or otherwise penetrating sealed compartments or frames that are filled with metal scrap for ballast.