Regulations for the construction of compressed-air self-help system in metal and nonmetal underground mine
1 Scope
This standard specifies the installation, maintenance and management requirements of compressed-air self-help system in metal and nonmetal underground mine.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendment) applies.
GB 16423 Safety regulations for metal and nonmetal mines
3 Terms and definitions
3.1
compressed-air self-help system
system that provides fresh air flow underground when a mine disaster occurs, including air compressor, air supply pipeline, tee and valve, oil mist separator, compressed-air self-help equipment
3.2
compressed-air self-help equipment
device installed on the compressed-air pipe and providing fresh air to users through protective bags or masks, which has the functions of reducing pressure, throttling, eliminating noise, filtering, switching and so on
3.3
oil mist separator
device for separating oil droplets and moisture in compressed air
4 Construction requirements
4.1 The compressed-air self-help system shall be built and improved in metal and nonmetal underground mines according to the actual needs of safety and risk avoidance. The compressed-air self-help system may be shared with the production compressed-air system.
4.2 The compressed-air self-help system shall be designed and constructed according to the design requirements.
4.3 The compressed-air self-help system shall be installed on the ground and can be started within 10 min. If an air compressor is installed on the ground, making it difficult to ensure effective air supply to the underground operation site, it may be installed in the underground site where the air source quality is not affected by the production operation area and the surrounding rock is stable and the support is good.
4.4 The compressed-air pipe shall be made of steel material or other flame retardant materials with the same strength.
4.5 The compressed-air pipes shall be laid firmly and straightly, and extended to the main places such as underground mining workplaces, emergency refuge facilities, and places where evacuees are concentrated during blasting.
4.6 A group of tee and valves shall be installed every 200 m ~ 300 m on the compressed-air pipe of air inlet drift in each main production level and sublevel.
4.7 A group of tee and valves shall be installed on the compressed-air pipe at a distance of not more than 100 m from the heading face of the blind heading drift, and a group of tee and valves shall be installed every 200 m ~ 300 m outwards. A compressed-air self-help equipment shall be installed on the compressed-air pipe at a distance of no more than 100 m from the heading face of the blind heading drift where deleterious harmful gases gush out.
4.8 During blasting, a group of tee and valves shall be installed on the compressed-air pipe at the place where evacuees are concentrated.
4.9 The compressed-air pipe shall be connected to the emergency refuge facilities and equipped with air supply valves. A connected mine compressed-air pipeline shall be equipped with a pressure reducing, silencing, filtering devices and control valves. The pressure of the compressed-air outlet shall be 0.1 MPa ~ 0.3 MPa, the air supply volume shall not be less than 0.3 m3/min per person, and the continuous noise shall not be more than 70 dB (A).
4.10 The compressed-air self-help equipment, tee and valve shall be installed in a spacious and stable place where it is convenient for disaster avoidance personnel to use; the valves shall be opened and closed flexibly.
4.11 An oil mist separator shall be installed in the main compressed-air pipe.
4.12 The supporting equipment of the compressed-air self-help system shall comply with the regulations in relevant standards, while those included in the safety sign management shall obtain the safety signs of mining products.
4.13 The compressed-air self-help system can be put into use only after it is installed and accepted.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Construction requirements
5 Maintenance and management
