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Factors to consider when purchasing a new set of longwall shields.

Authors
Barczak-TM
Source
Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :245-252
NIOSHTIC No.
20000891
Abstract
Purchasing a new set of longwall shields requires a substantial investment. A poor shield design can lead to economic hardships, safety concerns for the mine workers, and closure of the mine. This paper addresses several key points that should be considered in the procurement process: (1)understanding your goals and the logic in selecting a higher capacity shield, (2)the importance of completing performance testing before production shield fabrication begins, (3)making sure performance testing is properly done, (4)measuring load (stress) development during performance testing, (5)testing a shield to failure, and (6) the value of buying extra shields. In addition, several challenges are proposed for consideration in future shield designs. These include (1)100,000 life-cycle expectancy, (2)improved hydraulic diagnostic capability, (3) smart load control by optimizing setting pressures, (4)lubricated link joint design concepts, (5)composite material applications to reduce shield weight, (6) incorporating periodic weighting predictive algorithms into the data-processing software, (7)advanced component load measurement on two to three specially instrumented shields to detect loading in the structural components, and (8) constant set leg cylinder design.
Keywords
Coal-mining; Structural-analysis; Performance-capability; Accident-analysis; Accident-potential
Publication Date
20001001
Document Type
Conference/Symposia Proceeedings
Editors
Mark-C; Dolinar-DR; Tuchman-RJ; Barczak-TM; Signer-SP; Wopat-PF
Fiscal Year
2001
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
Information Circular 9453 - Proceedings: New technology for Coal Mine Roof Support
State
PA
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