Each of the compressors is equipped with independent gauges to assess its operating performance. In addition to the compressor gauges are those placed along the flow line. A low pressure gauge is placed downstream of the primary compressors but upstream of the booster compressor. This gauge allows assessment of the performance of the primaries. A high pressure gauge is placed downstream of the booster compressor to assess the performance of the primaries and booster when high pressure compressed air is required. Pressure gauges are also placed upstream and downstream of the water injection pump and the solids injector. These gauges allow assessment of the performance of these injection systems. All these gauges must be high quality gas gauges. Most drilling rig floors are equipped with a mud pressure gauge. For air drilling operations this mud gauge must be replaced with a high quality gas gauge having the appropriate pressure range.
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