Safety measures to prevent hypoxia and gas poisoning accidents

2. The mine ventilation system should be completely independent and should not be shared with other mines. The goaf and the scrap roadway must be closed in time, which can effectively prevent other mine disasters from involving their own mines and improve ventilation efficiency. Closed and non-combustible materials are used for construction, tightly and without air leakage, and there are anti-pools or anti-water pipes in the air.

The mine should have a complete independent ventilation system

3. Strengthen the management of ventilation facilities. Temporary stoppages must not stop the wind, otherwise the power supply must be cut off, fences should be set up, warning signs should be revealed, and personnel should be prohibited from entering. The damper, wind window and wind bridge that control the wind flow are set up reasonably. The wall is constructed with incombustible materials and is tightly airtight. The damper is not less than 2 channels and can be automatically closed.

4. The local ventilator should use the mining type. The press-in local ventilator and starter must be installed in the air inlet duct, no less than 10m from the return air inlet, no circulating wind, must be raised when placed, and the height from the ground (rail surface) is greater than 0.3m. The air volume at the exit of the wind and the distance to the working surface are in accordance with the provisions of the operating regulations, generally not more than 6 meters, and the hanging should be straight. The windshield is made of flame retardant material.

5. A large amount of toxic and harmful gases will be generated during the blasting process. After firing, the blasting must be continued for more than half an hour. After the toxic and harmful gas concentration drops to a safe concentration, the personnel can enter the blasting site.

6. In the place where the wind is stopped for a long time, a large amount of toxic and harmful gases are accumulated, and oxygen is seriously insufficient. In order to resume operations at these locations, special safety measures must be prepared in advance and reported to the technical person in charge of the mine for approval and strict implementation.

7. It is strictly forbidden to use more than 3 (including 3) local fans to supply air to one working surface at the same time. Do not use one local ventilator to supply air to two working surfaces at the same time.

8. Strengthen the wind measurement and gas measurement work, equip with sufficient full-time gas inspectors and gas detection instruments, implement the gas inspection system and the gas report review system of the mine manager and technical leader. The mine wind measurement record and gas inspection record must be filled in according to the regulations. The record must be “three pairs of ports” (ie, the board, the record book, and the report data should be consistent). The wind is measured once every ten days, and the gas concentration is measured at least twice per shift in the low gas mine. If an abnormal situation is found, the main person in charge of the mine must be immediately reported and appropriate safety measures such as evacuating the operator and powering off should be taken.

The coal mine must implement the gas inspection system and the mine director and technical person in charge of the gas daily review and signature system.

The mine should be equipped with sufficient full-time gas inspectors and gas detectors

9. Mines with coal seams that are prone to spontaneous combustion should strengthen downhole CO detection. Once the CO concentration is exceeded, the cause should be identified and corresponding safety measures should be taken.

10. The unleashed goaf generally accumulates a large amount of toxic and harmful gases. When the coal mining face and the excavation face pass through the goaf, the operator should be evacuated immediately to enhance ventilation. After testing, the toxic and harmful gases are reduced to a safe concentration. You can re-enter the work location at the rear.

11. Gas poisoning and anoxic suffocation accidents occur in the underground. In the absence of effective safety measures, it is very dangerous to take risks and often cause accidents to expand. It is necessary to try to supply air to the accident site. The rescue personnel enter the accident site and check the concentration of oxygen and toxic gas on one side, and indeed meet the requirements of the Regulations before entering. When there is a self-rescuer or a respirator, after the test is completed in the fresh airflow, the group of 2 people can enter the accident site to quickly rescue. If you do not have the conditions for rescue, immediately contact the local coal management department or the nearest mine rescue team to request assistance.

Concentric Reducers

concentric reducer: the center of the size is on the same line. forming process: suppress necking, expanding suppress or necking plus expanding repression. some sizes can also be stamping. Forming process: suppress necking, expanding suppress or necking plus expanding repression, stamping.

Concentric Reducers,Carbon Steel Concentric Reducer,Double Flanged Concentric Reducer,Pipe Reducer

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