(1)Valves, pipes, bends and other fittings of the gas pipe lines shall be of BIS standard.(2)The compressed air distribution system shall be provided with suitable isolating valve at every branching off point.(3)Main air line shall be provided with suitable isolating valve in the underground so located that air supply to underground can be effectively and quickly stopped if required.(4)Suitable water tap or drain cock shall be provided before the isolating valve and the accumulated water in the tap shall be drained regularly before opening the isolating valve.(5)Suitable pressure gauge shall be provided at the outlet side of the isolating valves on the main air range on the surface as well underground to ensure proper functioning of the valves.(6)All the pipe conveying pressurised air shall be of standard make, type, robust and tested for quality and of antistatic type and the fitting of the pipes shall be properly secured to prevent accidental disconnection.(7)Underground pipe lines carrying methane shall be installed on the floor or hung from the roof in the return air way which shall be plotted on the mine plan.(8)The pipeline shall not be installed on the floor where haulage is operative or conveyor is in operation and be graded to minimize sagging in order to avoid accumulation of water:Provided that in case there exists a sagged part of the pipelines, water taps shall be installed at such places to drain out water regularly.(9)The underground main transport line shall be grounded using metal bands and grounding wires shall be connected to the general earthing system of the mine.(10)Testing of earthing system of the gas transportation pipe lines at a interval of not more than one month shall be done by a competent person authorised for the purpose and record of the same shall be kept in a bound paged book duly signed by the competent person and counter signed by the official in - charge of CBM or CMM or AMM project, colliery engineer and manager.(11)Suitable arrangements shall be made to dissipate static electric charge from the full length of gas pipeline.(12)The places in the mine where gas pipelines pass or cross through the intake airway, the pipeline should be installed within a larger pipe and routed to the return and suitable warning notice shall be displayed at such places.(13)The gas pipelines shall be accompanied by tracer tubing safety system.(14)Suitable arrangement shall be incorporated in the pipe lines to protect against the leakage or rapture of gas pipelines in underground.
