Drilling and Workover Rigs13 May 2019 11:42
Going back to the Noise Mitigation Scheme submitted in the planning application for HH-1z and HH-2 I see:
"The British Drilling and Freezing Rig 28 has been contracted for the appraisal drilling programme. The sound power level LwA emitted in any given direction is between 99 and 113 dB according to the noise survey report provided by the contractor. The rig has directional characteristics so the actual value measured at a particular point will vary according to the orientation of the rig. At Horse Hill the rig will be oriented with its pipe racks directed due east."
Further:
"The P W Well Services Ltd Ideco H-35 workover rig has been contracted to provide workover services: these services do not include any drilling. The sole significant noise source on the rig is the Detroit Diesel 8V71 engine, which develops 307kW. An auxiliary power generator and an air compressor will also be required."