Report of Investigations 9261: Abrasive-Enhanced Water-Jet Drill for Hard Rocks

Details

• Journal Article:
  MISSING
• Personal Author:
  Krawza, Walter G. ; Savanick, George A.
• Description:
  The U.S. Bureau of Mines has patented and transferred to industry an abrasive-enhanced water-jet rock drill. This drill incorporates three novel components: a collimator, jet deflectors for cutting clearance, and an unpressurized swivel, which rotates at 1,000 rpm while passing 20 gpm of an abrasive slurry flowing at 1,000 ft/s. Drilling occurs through the action of a 10,000-psi, 20-gpm water jet into which is entrained 22 lb/min of abrasives. The pumps, hoses, and fittings are those commonly used in the water-jet-cleaning industry. Only inexpensive, common sandblasting abrasives are used. This drill can cut through hard rocks with moderate-pressure jets; e.g., rocks with a compressive strength of 73,000 psi can be drilled with a 10,000-psi abrasive jet. In addition to drilling holes, the drill can cut deep, narrow kerfs; collar a hole at any angle; drill through rubble; and chamber holes. The development of the abrasive jet drill is a significant advance in the state of the art of hard- rock drilling. The government of the United States has licensed the abrasive jet drill patent to weatherford water jetting systems. [Description provided by NIOSH]
• Subjects:
  Engineering Mining Occupational Health Safety
• Source:
  MISSING :10 pages
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  United States
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  16 pdf pages
• NIOSHTIC Number:
  nn:10007262
• Federal Fiscal Year:
  1989
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:425c35cc30730fa9f019448b559991927485335564af74cfbbdc510ab325cd17d7b777b41387d1a9a5360e16191008884847db0463be1d95be8fe1566884a687
• Download URL:
  https://stacks.cdc.gov/view/cdc/10296/cdc_10296_DS1.pdf
• File Type:
  [PDF - 5.89 MB ]