What type of seals must be used to construct a hardened room?
a. You are not sealing off an abandoned area. No monitoring. b. Would a 75.335(a)(1) seal suffice? The hardened rooms mentioned in the December 8, 2006 final Mine Emergency Evacuation rule at 30 C.F.R. 75.1714-4(d)(1) can be used as for breathable air, but were first proposed as SCSR storage locations in crosscuts between adjacent escapeways. As required in the Emergency Mine Evacuation rule, these rooms must be built using MSHA seals requirements (currently 50 psi), in order to prevent damage to the stored SCSR units. 51. If pressurized air lines are used to comply with the MINER Acts breathable air requirement, what steps will MSHA take to assure that these lines are installed and maintained safely? a. Can a mine operator put a borehole down with an air compressor (compressed air) at the top of the borehole (or centrally located) and run air lines from the borehole to pipe the compressed air into various sections of the mine? Yes, provided that all portions of the compressed air line
