CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.
As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
[PDF-5.89 MB]
Details:
-
Personal Author:
-
Corporate Authors:
-
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." - NIOSHTIC-2
NIOSHTIC no. 10007262
-
Subjects:
-
Series:
-
Subseries:
-
Document Type:
-
Genre:
-
CIO:
-
Pages in Document:10 numbered pages
-
NIOSHTIC Number:10007262
-
Resource Number:RI 9261
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
