A to Z Index | Find It! in DOL | [skip navigational links] Search MSHA's Website |
Printer Friendly Version
ISSUE DATE: March 28, 2007 PROGRAM INFORMATION BULLETIN NO. P07-08 FROM: KEVIN STRICKLIN Acting Administrator for Coal Mine Safety and Health MARK E. SKILES Director of Technical Support SUBJECT: Potential Hazard to Roof Bolting Machine Operators Due to Inadvertent Control Actuation Who needs this information? Underground coal miners, operators of underground coal mines, manufacturers of roof bolting machines, and Coal Mine Safety and Health (CMS&H) personnel. What is the purpose of this bulletin? The purpose of this Program Information Bulletin (PIB) is to alert the coal mining industry and CMS&H personnel to a potential hazard to roof bolting machine operators due to the sudden movement of the machine or machine components caused by the inadvertent actuation of machine controls. Information The investigation of a fatal machinery accident revealed that a potential hazard exists on roof bolting machines with machine controls that are not protected against unintentional activation. This hazard is increased when an operator is at the drill station and, at the same time, controls at other operating stations on the same machine can unintentionally actuate machine functions. Although the fatality occurred when an Automated Temporary Roof Support (ATRS) control was inadvertently actuated on a bolting machine retrofitted with a Safe Shield ATRS system, potential hazards exist from other inadvertent control actuations as well. Likewise, inadvertent control actuations can occur at unattended controls on other bolting machines. To prevent similar accidents, the following measures should be taken:
What is the background for this PIB? A roof bolting machine operator was fatally injured when the ATRS controls were inadvertently actuated, causing the ATRS system to unexpectedly retract and strike the operator at the drilling control location. Investigation findings support a conclusion that a box containing two resin cartridges fell from the top of the machine onto the ATRS controls situated in the operator's compartment at the side of the machine. The operator was crushed between the ATRS and the machine. In this accident, the ATRS system involved was retrofitted by Safe Shield Corporation of Richlands, Virginia, and featured a "tilt" jack which folded the ATRS onto the drill boom for tramming from place to place. The tilt jack control was accidentally struck and activated by the resin box. On the machine involved in the accident, the ATRS would fold onto the drill boom from the full upright position in approximately one second when the ATRS tilt control was fully activated. Following the fatal accident, the subject machine was retrofitted with diversion valves to deactivate all the controls in the operating compartment when the drilling controls were being operated. The retrofit work also included the addition of a small orifice in the hydraulic line of the ATRS tilt jack to slow the speed of the ATRS while it folds onto the drill boom. What is MSHA's authority for this PIB? The Federal Mine Safety and Health Act of 1977, as amended, 30 U.S.C. § 801 et seq.; 30 C.F.R. part 75, subpart C. Who is the MSHA contact person for this PIB? Coal Mine Safety and Health, Division of Safety Salwa El-Bassioni, (202) 693-9525 E-mail: El-Bassioni.Salwa@dol.gov Technical Support, Pittsburgh Safety and Health Technology Center William Gray, (412) 386-6787 E-mail: Gray.William@dol.gov Technical Support, Approval and Certification Center Eugene D. Hennen, (304) 547-2057 E-mail: Hennen.Eugene@dol.gov Is this PIB on the Internet? This PIB may be viewed on the Internet by accessing the Mine Safety and Health Administration (MSHA) home page (www.msha.gov) and then choosing "Compliance Info" and "Program Information Bulletins." Who will receive this PIB? MSHA Program Policy Manual Holders Underground Coal Mine Operators Roof Bolting Machine Manufacturers Coal Special Interest Groups |
Back to Top | www.msha.gov | www.dol.gov |
| ||
---|---|---|
| ||
Mine Safety and Health Administration (MSHA) 1100 Wilson Boulevard, 21st Floor Arlington, VA 22209-3939 |
Phone:
(202) 693-9400 Fax-on-demand: (202) 693-9401 Technical (web) questions: Webmaster On-line Filing Help: MSHAhelpdesk@dol.gov or call (877) 778-6055 Contact Us |