1, the drainage pipeline passes through the roadway with few curved sections and short distance, and the pipeline installation should be straight, and the turning angle should not be greater than 50;
2. The gas drainage pipeline system should be arranged in the return air roadway or the roadway where harvesters don't often pass; If it is located in the main transport lane, its erection height should not be less than 1.8m on the sidewalk side, and it should be fixed on the roadway wall, and the distance from the roadway wall should meet the maintenance requirements; The outer edge of gas drainage pipe fittings should not be less than 0.1m; From the roadway wall;
3, when the drainage equipment or pipeline fails, the gas in the pipeline shall not flow into the coal mining face and electromechanical cavern;
4, the gas pipe diameter should be unified, and the transition section must be set when the diameter is changed.
5. The diameter of the gas drainage pipeline shall be calculated by sections according to the maximum flow rate, and be adapted to the capacity of the drainage equipment. The diameter of drainage pipeline is calculated according to the economic flow and the maximum throughput of 5m/s ~ 15m/s, and the standby capacity of drainage system pipeline is 10%.
6. When special drilling holes are used to lay drainage pipes, the diameter of the special drilling holes should be larger than the total size of the pipes100 mm; When laying drainage pipeline along the shaft, the pipeline should be fixed on the guide beam or special pipe rack.
7, drainage pipeline including friction resistance and local resistance; Friction resistance can be calculated by the resistance formula of low negative pressure gas pipeline; The local resistance can be calculated by estimation method, generally taking 10% ~ 20% of the frictional resistance.