The flow line to the standpipe of the drilling rig acts as a manifold collecting the compressed air outputs from the primaries. These flow lines are API 2 7/8 inch (OD), or 3 1/2 inch (OD) steel line pipe (or ASME equivalent) . The valves in the flow line at the booster compressor allow the air flow from the primaries to be diverted to the booster when high compression of the air is needed. When higher compression is not needed the booster compressor is isolated with the check valves in the flow line to the rig.
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