Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Performance and safety considerations of hydraulic support systems.

Authors
Barczak-TM; Gearhart-DF
Source
Proceedings of the 17th International Conference on Ground Control in Mining, August 4-6, 1998, Morgantown, West Virginia. Peng SS, Holland CT, eds., Morgantown, WV: West Virginia University, 1998 Aug; :176-186
Link
NIOSHTIC No.
20000106
Abstract
Hydraulic cylinders are used in several roof support systems, such as longwall shields and mobile roof supports, to provide critical ground control. Many state-of-the-art hydraulic support systems operate at pressures as high as 7,000 psi to provide the necessary support capacities. Pressure in the upper stages of multi-stage cylinders can be intensified by a factor of 2 or 3 providing pressures of 20,000 psi or greater. A proper understanding of the operation of these high pressure systems is necessary to safely maintain and repair these support systems. Likewise, the performance characteristics need to be fully understood to evaluate the impact of design parameters on the capability of the support to maintain effective ground control. This paper examines the basic operating principles of state-of-the-art hydraulic cylinders and discusses relative issues pertaining to:(1) setting loads,(2) support stiffness,(3) yielding behavior,(4) errors in assessing support loading, and (5) hydraulic failure mechanisms and how to detect them.
Keywords
Underground-mining; Ground-control; Hydraulic-equipment; Mine-safety; Mining-industry
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Publication Date
19980804
Document Type
Conference/Symposia Proceedings
Editors
Peng-SS; Holland-CT
Fiscal Year
1998
NTIS Accession No.
NTIS Price
ISBN No.
0939084569
NIOSH Division
PRL
Source Name
Proceedings of the 17th International Conference on Ground Control in Mining, August 4-6, 1998, Morgantown, West Virginia
State
PA; WV
TOP