GB 47291-2026Technical requirements for compressed air self-rescue systems in coal mines (English PDF)

5.1 General Requirements

5.1.1 All underground coal mines should establish a compressed air self-rescue system.

5.1.2 The design of the compressed air self-rescue system should meet the actual conditions and safety avoidance needs of underground coal mines, and should comply with coal mine safety requirements. The gas parameters should meet the following requirements.

a) The gas supply pressure at the pipeline terminal should be within the range of 0.3MPa to 0.7MPa;

b) The air supply volume should meet the needs of the terminal gas consumption points or emergency refuge facilities, and the design should comply with the provisions of

8.4.2 in GB 50215-2015. Determine the pipeline leakage coefficient and altitude correction factor;

c) Air quality shall comply with the requirements of Table 1 in GB 31975-2025.

5.1.3 Measures to ensure a continuous and stable supply of compressed air to the self-rescue system should be included and clearly specified in the design. The compressed air station should have automatic... The start/stop and pressure replenishment functions should include measures for pipeline management and maintenance.

5.1.4 The compressed air self-rescue system shall be equipped with monitoring equipment or instruments to monitor the operating status of the compressed air self-rescue system and parameters such as air supply pressure.

5.1.5 The compressed air self-rescue system should be replenished and improved in a timely manner as mining operations change.

5.1.6 When the equipment and facilities of the compressed air self-rescue system are shared with the compressed air system used in production, the shared equipment and facilities shall comply with the provisions of this document.

5.2 Compressed Air Station

5.2.1 A compressed air station should be built on the surface of the mine.

5.2.2 In addition to complying with the provisions of GB 50029, the design of compressed air stations shall also meet the following requirements.

a) Air compressors should be installed in areas with good airflow, away from areas emitting explosive, corrosive, toxic gases, dust, or other harmful substances. Location. Gas storage tanks should be installed outdoors or in a separate building, and should be protected from direct sunlight.

b) The nominal volumetric flow rate of the compressed air station shall be specifically designed and calculated based on emergency escape requirements, and shall not be less than that of the underground mining operation area. The air volume required for self-rescue by the maximum number of workers in the shift.

c) The air compressor should be equipped with a pressure gauge and a safety valve. The safety valve and pressure regulator should operate reliably, and the operating pressure of the safety valve should not exceed [the specified limit].

1.1 times the rated pressure.

d) The open flash point of the air compressor lubricating oil should not be lower than 215°C. Air compressors using oil lubrication should be equipped with an oil cut-off protection device. Water-cooled air compressors should be equipped with either a water shortage protection device or a water shortage signal display device.

e) The compressed air station should be equipped with an oil-water separator, and a check valve should be installed between the final exhaust port of the air compressor and the air storage tank.

f) The gas storage tank should be equipped with a pressure gauge, safety valve, drain valve, and inspection port. A pressure relief valve should be installed on the outlet pipeline of the gas storage tank. The diameter should not be less than the diameter of the outlet duct, and the release pressure should be

1.4 times the maximum working pressure of the air compressor.

g) The exhaust temperature of the air compressor and the temperature of the air tank should be monitored, and temperature sensors should be installed. These sensors should be able to detect when the temperature exceeds the limit. Light alarm.

5.2.3 Newly installed or repaired air tanks shall be subjected to a hydrostatic test at

1.5 times the working pressure of the air compressor to confirm that they meet the requirements.

5.2.4 Unattended compressed air stations should operate automatically and be equipped with automatic fire extinguishing devices, video surveillance, and connection to a ground control center. Two-way communication is established, and personnel conduct inspections.

5.3 Piping and ancillary facilities

5.3.1 The compressed air self-rescue system pipeline should be laid to all underground disaster relief sites, covering the disaster relief routes in the mining area, and connecting to refuge chambers and supply stations. Safety facilities, including those for mines with complex or extremely complex hydrogeological conditions, are extended to safe locations near mining faces and blasting sites. The highest point of the horizontal, mining area and uphill tunnel.

5.3.2 The main pipeline of the compressed air self-rescue system shall be made of metal pipe and shall be arranged in the air intake shaft or air intake tunnel.

5.3.3 The specifications of the compressed air duct should meet the air supply requirements, and should be specifically designed and calculated according to parameters such as the required air volume, air supply distance, and resistance loss. However, the diameter of the main pipeline should not be less than 100mm, and the diameter of the pipeline at the mining face should not be less than 50mm.

5.3.4 Compressed air pipelines within 20m of the entrance to the refuge chamber and within 40m of the mining face should be buried or constructed using methods that meet the requirements. Steel wire braided hoses are required for coal mine safety, but buried hoses should not be used in coal seams with a risk of rock bursts; instead, steel hoses that meet the required specifications should be used. Braided tubing is used for connection.

5.3.5 The lowest point in the undulating area of the wellhead and underground pipelines, the starting point of the ascent, and the entrance to refuge chambers and supply stations, etc. At the outlet, an oil-water separator or drain valve should be installed, and the drain valve should be easy to observe the liquid level.

5.4 Compressed air self-rescue supply valve and compressed air self-rescue device

5.4.1 Compressed air self-rescue supply valves should be installed at the following locations, and the air supply capacity of the compressed air self-rescue supply valves should meet the emergency escape requirements.

a) Along the disaster avoidance route in the mining (panel) area, at intervals not exceeding.200m;

b) The highest points of each level, mining area, and uphill roadway in mines with complex or extremely complex hydrogeological conditions;

c) Within 40m of the mining face;

d) Inside refuge chambers, supply stations, and other emergency shelters.

5.4.2 Compressed air self-rescue devices should be installed at the following locations, and the number of devices installed should meet the design requirements for the number of people required to evacuate or work.

a) Outburst-prone coal seams and rockburst-prone coal seams within 25m to 40m of the mining face;

b) Areas with personnel working in the return airway of outburst-prone or rockburst-prone coal seams;

c) In outburst-prone coal seams, rockburst-prone coal seams, and rock tunnels with the risk of abnormal emissions of dangerous gases such as carbon dioxide, hydrogen sulfide, and methane. The detonation location, the guard posts, and the location of evacuees for the detonation operation;

d) In long-distance tunnels through outburst-prone or rockburst-prone coal seams, one set of tunneling equipment should be installed every.200m or less, and each set should meet the following requirements. Used for evacuation of 5 to 8 people;

e) When the advancing length of the coal face in a coal seam prone to outbursts exceeds 500m, the number of installations within 500m of the working face should meet the requirements. The number of workers on the surface needs to avoid risks.

5.4.3 The location of the air supply valve or compressed air self-rescue device should be clean, unobstructed, and well supported, and the installation height should be convenient for opening and use.

5.4.4 The gas supply valve should be a ball valve with a main body made of copper or copper alloy or stainless steel.

5.4.5 Compressed air self-rescue devices shall be classified and modeled in accordance with the provisions of Appendix A, and their functional structure and working parameters shall meet the following requirements.

5.5 Monitoring Instruments and Meters

5.5.1 Pipeline ends and pipeline terminals with compressed air self-rescue devices installed in refuge chambers, supply stations, and other safety facilities, as well as at mining faces, should be equipped with [safety nets/equipment]. Place a pressure gauge.

5.5.2 The explosion-proof performance of electronic monitoring instruments installed underground shall comply with GB/T 3836.1, GB/T 3836.2, and GB/T 3836.4. Relevant regulations.

5.5.3 Online monitoring sensors installed according to design or management needs shall meet the requirements of AQ6201.

7.1 Management

7.1.1 Coal mines should clearly define the responsible department and its duties for the management and maintenance of the compressed air self-rescue system, and establish rules and regulations.

7.1.2 Coal mines shall draw up a layout diagram of the mine compressed air self-rescue system. The layout diagram shall clearly show the pipeline routing, air supply valves, and self-rescue mechanism of the compressed air self-rescue system. The installation location and quantity of the equipment, or the number of personnel it can serve for evacuation, should be indicated, along with the gas supply capacity, and should be adjusted according to the actual changes in underground mining operations. The situation will be updated in a timely manner.

7.1.3 Emergency response plans for underground coal mine disasters, design of mining (panel) areas, operating procedures for mining and tunneling faces, and special designs or special plans for special operations. The measures should include the use of compressed air self-rescue systems.

7.1.4 When carrying out operations that may damage compressed air ducts, a report should be submitted to the department responsible for managing the compressed air self-rescue system before the operation begins, and the relevant department should be notified. Management or protective measures should be taken for compressed air pipelines in the area affected by the operation.

7.1.5 Personnel entering the mine should be familiar with the operation of the air supply valve and compressed air self-rescue device, and know their installation locations. Coal mines should ensure the proper functioning of the air supply valve... Training and practical exercises should be conducted on the use of compressed air self-rescue devices. Regular practical drills should be organized to demonstrate the use of compressed air self-rescue systems for emergency escape and self-rescue. The training cycle shall not exceed one year.

7.1.6 Relevant data and records of the compressed air self-rescue system should be archived. This includes design documents, layout drawings, completion acceptance records, and equipment qualification certificates. Parts and instruction manuals should be kept permanently. Training and exercise records, maintenance records, and periodic inspection records should be kept for no less than 3 years.

7.2 Maintenance

7.2.1 The compressed air station shall be inspected and maintained as required.

7.2.2 Pipelines and facilities should be inspected and maintained regularly, at least once a week, and the following should be confirmed.

a) The signs are clearly visible, unobstructed, and not damaged or detached;

b) The sidewalks where the gas supply valves and self-rescue devices are installed are clean and unobstructed, with no debris piled up or hanging;

c) When unattended or not in operation, the gas supply valve should not be connected to other equipment;

d) The gas supply valve and self-rescue device are undamaged and leaking; the protective bag is not tied and hangs naturally.

e) All valves on the gas supply valve and the gas supply line at the front end of the self-rescue device shall remain in the normally open position.

7.2.3 The air supply valve and compressed air self-rescue device should be checked regularly, at least once a month, to confirm that the air supply pressure is within the normal range. The valves of the air valve and the compressed air self-rescue device are sensitive and reliable, and the cover of the compressed air self-rescue device can be opened flexibly.

7.2.4 Before commencing work at the mining face, the gas supply valves and self-rescue devices at the mining face should be checked, and work can only commence after confirming that the gas supply is normal. Operation.

7.3 Inspection

7.3.1 Air compressors shall be inspected regularly in accordance with relevant regulations, with an inspection cycle not exceeding one year.

7.3.2 Pressure gauges and safety valves shall be calibrated in accordance with relevant regulations, and the calibration cycle shall not exceed one year.

7.3.3 For in-use compressed air self-rescue devices that are more than 3 years old from the date of manufacture, an initial in-use inspection should be conducted, followed by inspections annually. The inspection items shall be carried out in accordance with the provisions of Table B.1, and the equipment may continue to be used only after passing the inspection. GB 47291-2026. Technical Requirements for Compressed Air Self-Rescue Systems in Coal Mines ICS

09 National Standards of the People's Republic of China Technical Requirements for Coal Mine Compressed Air Self-Rescue System Published on 2026-02-

27 Implemented on 2026-09-

01 State Administration for Market Regulation The State Administration for Standardization issued a statement.