Modification and interpretation of coal mine safety protocol (2025 edition) (ix)
Revision 11: article 192. When ch4 concentrations in windstreams of 1. 0% or 1. 5% of co2 are reached in mining areas back into the alley, work must be stopped, personnel withdrawn, measures taken to process them。
(this provision provides for the evacuation of personnel upon meeting standards for hazardous gases in wells, the cessation of work and the modification of the criteria beyond harmonization to “achievement”, as compared with the 2022 version of the coal mine safety protocol, which defines the criteria
Amend 12: article 193 when methane concentrations in wind currents reach 1. 0% in the surface of extractive and other operations, electrical operations must cease; when methane concentrations reach 1. 0% in the inner windstream at 20 m near the site of the blast, the blast is strictly prohibited. Work must be stopped, power cut, personnel evacuated and processed when methane concentrations reached 1. 5% in wind currents on the surface of extractive work and at other locations or within 20 m near the location where the switch is installed. The mining surface and other alleys, where methane concentrations in space greater than 0. 5 m3 reached 2. 0 per cent, must stop work in the vicinity of 20 m, evacuate personnel, cut power and process it。
(this article provides for the cessation of electricity use, the suspension of work, the cutting of power and the evacuation of personnel, respectively, when methane concentrations in wind currents at the surface of extractive and other locations meet certain standards. There were two changes compared to the 2022 version of the coal mines safety protocol: the first was that when methane concentrations in wind currents reached 1. 0 per cent in the working surface and other locations of extractive and other operations, it would be more normative to stop the use of coal drills and to change the eye to power outages; and the second was to delete the 22nd version, which stated that electrical equipment that had been cut off from the power source by excess of methane concentrations must be operated at concentrations below 1. 0 per cent
Amend 13: article 196. Mines must be designed and managed in a manner that prevents the accumulation of gas; when the accumulation of gas occurs, it must be addressed in a timely manner. When the gas ceiling reaches the power outage concentration, the squad leader, the gas inspector, the safety inspector and the mine dispatcher have the right to order the on-site operator to cease operations and the power outage. The mine must have security measures to restore ventilation, remove gas and send electricity after the power outage and overhaul of the main ventilator or damage to the ventilation system. After normal ventilation, all sites affected by the ventilation must undergo ventilation and a gas inspection to confirm that they are not in danger before returning to work. All electric motors and their switches must be checked in the 20m alleyway near the location, and only when methane concentrations meet the requirements of this protocol. The site of the temporary stoppage must not stop the wind; otherwise, the power of non-essentially secure electrical equipment must be cut, fences, alarms must be set, persons must be barred from entering and reported to the mine control unit. Where methane or carbon dioxide concentrations of 3. 0 per cent or other hazardous gases in the shutdown area exceed the requirements of article 156 of these regulations for immediate disposal, they shall be closed within 24h。
(this article provides for disposal measures related to the prevention of gas build-up and the release of gas build-up, with the right to “security checkers” added to the personnel who were required to stop operations when the gas ceiling reached the power outage concentration, as compared to the 2022 version of the coal mine safety protocol; it also provides that “no wind stoppage shall take place at a place where there is a temporary stoppage; otherwise the power must be cut off” to “must be removed from the power supply of non-essentially safe electrical equipment” because of the important responsibility of safety examiners to perform safety inspections, check-ups and dispose of safety hazards under the coal mine, and the new protocol gives security examiners the right to stop-out in case of a gas outage, more in line with the actual security management of the mine; because of the safety of the essential security electrical equipment, there is no danger, such as causing damage in the event of an excess, the current modification will have to cut off the electricity supply of non-essentially safe electrical equipment, closer to the physical spot.)
Personal opinion, welcome criticism
(to be continued)
