Every mining area The anemometer station of the first wing return airway and the main return airway shall be equipped with a wind speed sensor, and the air tunnel of the main ventilator shall be equipped with a pressure sensor; the suction pipeline of the extraction pump of the gas extraction pump station shall be provided with a flow sensor, a temperature sensor and a pressure sensor,dth hammer bit, and when using gas, the output pipeline shall also be provided with a flow sensor, a temperature sensor and a pressure sensor. Carbon monoxide sensors and temperature sensors shall be installed in mines using explosion-proof diesel power devices and mines mining coal seams prone to spontaneous combustion and spontaneous combustion. Main ventilators and local ventilators shall be equipped with equipment start and stop sensors. The air compressor shall be located on the ground. For deep multi-level mines, when the air compressor is installed on the ground and it is difficult to ensure effective air supply to the underground operation point, it can be installed at a safe and reliable position at the bottom of the air intake shaft two levels above the air supply level, and obtain the safety mark of coal mine products, but it is not allowed to select the sliding vane air compressor. 42. The pipeline specification of the compressed air self-rescue system shall be in accordance with the air demand of the mine. Air supply distance, resistance loss and other parameters are calculated and determined, down the hole bit ,dth drilling hammer, but the diameter of the main pipeline is not less than 100 mm, and the diameter of the mining face pipeline is not less than 50 mm. 43. Compressed air pipelines shall be laid on the route for avoiding disasters in all mining areas of the mine. Air supply valves shall be set at intervals of no more than 200m. Conditional mines can be equipped with compressed air self-rescue devices. For mines with complex and extremely complex hydrogeological conditions, compressed air pipelines shall be laid at each level, mining area and the highest part of the rise roadway, and air supply valves shall be set. 80. System operation and management data, including equipment layout Equipment standing book, statement, duty record,Borehole Drill Bits, maintenance record, list of equipment and facilities, product safety mark certificate and inspection report. Return to Sohu to see more Responsible Editor:. wt-dthtools.com