Daily Rules, Proposed Rules, and Notices of the Federal Government
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44 U.S.C. 3507(a)(1)(D).
Potentially gassy (explosive) conditions underground are largely controlled by main fans. When accumulations of explosive gases, such as methane, are not swept from the mine by the main fans, they may reasonably be expected to contact an ignition source. The results of such contacts are usually disastrous, and multiple fatalities may be reasonably expected to occur. The Main Fan Operation and Inspection standard contains significantly more stringent requirements for main fans in gassy mines than for main fans in other mines. Regulations 30 CFR 57.22204, which only applies to gassy metal and nonmetal underground mines, requires main fans to have pressure-recording systems. The standard also requires main fans to be inspected daily while operating if persons are underground and certification made of such inspections by signature and date. Certifications and pressure recordings must be retained for one year and made available to authorized representatives of the Secretary.
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