A to Z Index | Find It! in DOL | [skip navigational links] Search MSHA's Website |
Printer Friendly Version
ISSUE DATE: June 16, 2006 PROGRAM INFORMATION BULLETIN NO. P06-13 FROM: Ray McKinney Administrator for Coal Mine Safety and Health SUBJECT: Common Air Courses and Examinations Who needs this information? Mine Safety and Health Administration (MSHA) enforcement personnel, coal mine operators, and miners' representatives need this information. Why is MSHA issuing this Program Information Bulletin (PIB)? This PIB reminds the mining community of MSHA's characterization of common air courses and the need to examine each separate intake and return air course in the mine on a weekly basis [30 CFR § 75.364(b) (1) & (2)]. What is the background for this PIB? An air course is defined in 30 CFR § 75.301 as:
What are the main points of this PIB? Common air courses are functionally equivalent to a single air course; therefore, weekly examination on only one side of common air courses satisfies the requirements of 30 CFR § 75.364(b) (1) & (2). Air courses are considered common if they are connected through openings or cross-overs every 600 feet or less. Each portion of air courses that are not connected at intervals of 600 feet or less with non-restrictive openings have to be separately traveled during the weekly examination. The connections between common air courses should be of sufficient size to provide free air exchange through non-restrictive openings. Non-restrictive openings provide at least 30% of the cross-sectional area of the non-examined side of the common air courses. Non-restrictive openings are necessary to minimize potential changes to the mine ventilation system if roof falls, water impoundments, or other blockages were to occur in the unexamined side of the common air courses. What is MSHA's authority for this PIB? 30 CFR § 75.301, 30 CFR § 75.364(b) (1) & (2), Preamble to 1992 Ventilation Rule [Fed Register, Vol. 57, No. 95, p 20870]. Who is the contact person for this PIB? Coal Mine Safety and Health, Safety Division H. Erik Sherer, (202) 693-9523 e-mail: sherer.hubert@dol.gov Is this PIB on the Internet? This Program Information Bulletin may be viewed on the World Wide Web by accessing the MSHA Home Page www.msha.gov and then choosing "Compliance Info" under the "Compliance Assistance" menu, then choosing "Program Information Bulletins." Who will receive this PIB? Program Policy Manual Holders Miners' Representatives Underground Mine Operators 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 |