Gas Drainage Management System
Chapter One: General Provisions
Article 1: In order to fully implement the various provisions of gas drainage in the "Coal Mine Safety Regulations", conscientiously implement the "Mine Gas Drainage Management Regulations", strengthen gas drainage management, improve drainage effect, prevent gas accidents, and ensure safe coal mine production, the "Shanxi Liulin Xinfly Hechang Coal Industry Co., Ltd. Mine Gas Drainage Management System" (hereinafter referred to as the "System") is specially formulated.
Article 2: This "System" applies to the infrastructure technical renovation period and the coal production period of Hechang Coal Mine.
Article 3: The Hechang Coal Mine Safety Supervision Station and Ventilation Department are responsible for supervising and checking the implementation of this "System".
Article 4: In addition to complying with the provisions of this "System", the gas drainage work of the mine must also conform to the relevant provisions of the current "Coal Mine Safety Regulations" and "Mine Gas Drainage Management Standards" of the country.
Chapter Two: Organizational Structure and Responsibility System for Gas Drainage Work
Article 5: Establish a Hechang Coal Mine gas drainage work leading group.
General Commander: Liu Xiyan (Mine Manager)
Deputy General Commander: Wang Yongfeng (Technical Mine Manager)
Members: Chang Yongping (Ventilation Deputy Engineer) Zhang Jianbiao (Safety Mine Manager)
Li Luliang (Production Mine Manager) Jia Yuzhen (Electromechanical Mine Manager)
Gao Lin (Director of Dispatching Office) Yang Baoguo (Assistant to the Mine Manager)
Song Xiaojun (Geological Survey Section Chief) Liu Yanwen (Technical Section Chief)
Che Yanjun (Ventilation Team Leader) Liu Fuping (Drainage Team Leader)
Establish a dedicated gas drainage team. Responsible for construction of drainage boreholes, installation of drainage pipelines and equipment, and daily management of gas drainage.
Article 6: The general commander is fully responsible for the gas drainage work of this mine, balances and solves the required funds and equipment for drainage, arranges the drainage project into the mine production plan, and reviews the design and construction plan of large-scale drainage projects in the mine.
Article 7: The technical mine manager is responsible for formulating and improving various management rules and regulations for gas drainage work, determining the personnel allocation of the drainage team, organizing the construction team, and managing the drainage work.
Article 8: The ventilation deputy chief engineer is technically responsible for the gas drainage work of this mine. Organize the compilation of long-term plans and annual plans for mine gas drainage, organize the review of drainage designs and related safety technical measures, organize the acceptance of drainage projects and the assessment of drainage plans, arrange drainage scientific research work and the promotion and application of new technologies and new equipment.
Article 9: The production deputy mine manager bears the main leadership responsibility for the gas drainage work of this mine. Responsible for arranging the succession of the drainage area and working face of the mine, balancing the relationship between drainage and mining and excavation production, and arranging the time and space needed for the drainage project. Responsible for leading the acceptance of the gas drainage system at the same time as the acceptance of the production face. Balance the relationship between development production and drainage, coordinate and solve the roadway engineering and drilling site engineering needed for drainage.
Article 10: The safety deputy mine manager is responsible for the safety work of gas drainage in this mine. Organize inspections on the implementation of safety measures for drainage projects, organize inspections on the use of safety protection equipment for mine gas drainage, and arrange safety supervision and inspection work for mine gas drainage.
Article 11: The electromechanical deputy mine manager is responsible for the organization and coordination of gas drainage in this mine. Balance the relationship between drainage and electromechanical transportation, arrange the electromechanical installation work of large-scale drainage projects in the mine, and balance the power supply guarantee needed for drainage.
Article 12: The engineer has direct leadership and management responsibilities for the gas drainage work of this mine. Responsible for organizing the implementation of long-term drainage planning and drainage plans, responsible for leading the standardization work of gas drainage quality, and supervising and guiding the daily management of the drainage team.
Article 13: The directors of the ventilation department and dispatching office, which are responsible for the drainage business of the mine, bear specific leadership responsibilities for the gas drainage work of the mine. Specific responsibilities include organizing the implementation of drainage plans and the acceptance of drainage project quality; responsible for collecting and managing basic technical data for drainage; responsible for formulating position responsibility systems for related trades in drainage and checking and supervising the implementation of various drainage management systems; responsible for reviewing gas drainage reports; responsible for summarizing and analyzing gas drainage work monthly, quarterly, and annually.
Article 14: The drainage team leader and safety supervisor bear direct responsibilities for the management of gas drainage work. Specifically responsible for arranging daily drainage work, arranging on-site drainage work. Responsible for organizing the technical knowledge education and training of the team's employees, arranging the use and management of drainage equipment. Responsible for implementing the drainage management system, implementing safety technical measures for drainage, implementing the quality acceptance system for drainage boreholes, specifically organizing and completing the drainage plan.
Article 15: The gas drainage team is responsible for the construction of drainage boreholes, installation of drainage pipelines and equipment, and daily management of gas drainage. The captains of the mining and excavation teams in the gas drainage working face have the responsibility to assist in managing the gas drainage system and the drilling work in their team's working area. Arrange employees to assist in protecting the drainage pipeline, prevent damage and leakage of the drainage pipeline to ensure the effect of gas drainage in the mining face.
Chapter Three: Gas Drainage Management Methods
Article 16: Gas drainage must be included as an important part of the mine's annual safety performance indicators.
Article 17: Gas drainage must be included in the mine's annual, quarterly, and monthly production plans, and issued and evaluated simultaneously with the mine production plan. The monthly drainage plan of the mine should be detailed in the monthly production plan of the mine. The content of the monthly drainage plan should include: progress arrangement of drainage construction projects, footage of drainage boreholes, volume of drained gas, and gas utilization volume, etc., as evaluation indicators.
Article 18: When arranging the mine's district design and mining and excavation succession plan, gas drainage succession plan must be arranged simultaneously, and sufficient drainage time must be considered to ensure the drainage effect.
Article 19: The long-term plan for mine gas drainage must be part of the long-term safety production plan of the mine, compiled and issued simultaneously with the long-term safety production plan, ensuring the connection between short-term drainage and long-term planning.
Article 20: The design of the permanent drainage system (surface permanent pump station) of the mine, or the underground district or local drainage system design, must be reviewed by the chief engineer of the mine before it can take effect. Drainage projects must be constructed according to the drainage design and related quality standards, and the design content cannot be changed arbitrarily.
Article 21: Mines with drainage must have "four diagrams, three records, three ledgers, two reports" that correspond to the actual situation on site.
Four diagrams: ① Mine gas drainage system plan view;
② Plan layout diagram of gas drainage pump station;
③ Layout diagram of drainage drilling sites and holes;
④ Power supply system diagram of drainage pump station.
Three records: ① Quality acceptance record of drainage project (including boreholes);
② Record of parameter measurement of pump station drainage;
③ Record of patrol inspection of drainage system.
Three ledgers: ① Ledger for management of drainage equipment and instruments;
② Ledger for management of drainage from the seam being mined;
③ Ledger for management of gas drainage from goaf areas.
Two reports: ① Daily report of mine gas drainage;
② Monthly report of mine gas drainage.
The content of the ledger for management of drainage from the seam being mined includes: number of boreholes connected to the network, hole length, drill footage per ton of coal, total drainage flow rate, average concentration of drained gas, average drainage volume per hundred meters of borehole, maximum and minimum negative pressure at the borehole mouth, cumulative volume of drained gas, and the drainage rate achieved in the month.
Article 22: For the working face using along-seam boreholes for pre-drainage of gas, drilling should be carried out while advancing. Before the working face is put into production, the pre-drainage borehole quantity for the seam being mined must reach the required drill footage per ton of coal specified in the following table, otherwise the working face cannot be put into production.
Drill footage per ton of coal unit: m/t
Coal seam category
Thin coal seam
(h ≤ 1.3m)
Medium-thick coal seam
(h = 1.3-3.5m)
Thick coal seam
(h ≥ 3.5m)
Easy to drain
0.05
0.03
0.01
Can be drained
0.05-0.1
0.03-0.05
0.01-0.03
Difficult to drain
≥0.1
≥0.05
≥0.03
Note: The difficulty level of coal seam drainage is divided according to Article 19 of the national "Mine Gas Drainage Management Standard".
Article 23: A gas drainage design must be prepared for any working face conducting gas drainage. The specific content includes:
(1). Overview of the working face: Information about the coal seam and adjacent coal seams (columnar chart), geological overview, parameters of the return mining working face, estimated gas emission, pipe system design, and prediction of drainage volume.
(2). Number of boreholes, parameters (starting and ending positions, upward angle, azimuth angle, diameter, rock layers penetrated).
(3). Sealing method and sealing length.
(4). Position of the gas drainage pump station, cross-section of the roadway, and ancillary facilities (underground mobile pump station).
(5). Equipment, facilities, and installation status for gas drainage.
(6). Diagrams of gas drainage installation and drainage instructions must be attached.
Article 24: Mines conducting gas drainage must establish a quality acceptance system for drainage drilling sites and boreholes. To ensure the quality of drainage borehole construction, strictly follow the design requirements for acceptance of drainage drilling sites and boreholes. After each drilling site and borehole is completed and passes inspection, it will be managed under a挂牌management system.
(1). Content of the drilling site management board: Drilling site number, borehole parameters and quantity, completion date, person in charge of drilling site construction, gas concentration, negative pressure.
(2). Content of the borehole management board: Borehole number, borehole parameters, completion date, borehole depth, person in charge of drilling, negative pressure, gas concentration, single-hole flow, etc.
Article 25: The drainage system that has been commissioned must implement a system patrol inspection system. Personnel from the professional drainage team are equipped to regularly inspect and maintain drainage equipment and pipeline systems, ensuring system negative pressure and gas concentration, and regularly measuring system drainage parameters (pump station atmospheric pressure, system drainage negative pressure, drainage flow, drainage gas concentration, drainage gas temperature). Each working face or goaf area’s drainage branch pipe must be equipped with drainage metering devices, regularly measuring gas drainage parameters, calculating drainage rates and volumes of drained gas.
Article 26: Establish a gas drainage observation system.
(1) Surface drainage pump operators must observe the system drainage situation every hour, fill in the observation board and record, and promptly report to the mine dispatch. The mine dispatch will fill in the reported content in the gas ledger.
(2) Before carrying out observations, gas drainage system observers must first record the previous shift's observation time and observation situation on the back of the corresponding column in the observation record card for verification.
(3) Observers start patrolling the pipeline one hour after taking over the shift.
(4) In the gas drainage system of each coal mining working face, each active drilling site (or borehole) must be equipped with an observation point. Each small shift must conduct observations once, carefully filling in the board (including borehole number, negative pressure, throttling situation, gas concentration, observation time, observer name, etc.), managed by the observer, ensuring that the observation board, observation record, observation shift report, and daily drainage report are consistent.
Article 27: During the construction of drainage boreholes, effective measures must be taken to prevent coal dust. While ensuring the effectiveness of dust removal at the borehole mouth, regular cleaning of accumulated coal dust at the drilling location must be insisted upon.
Article 28: When draining gas from goaf areas, detailed safety measures to prevent spontaneous combustion must be compiled, and sampling and analysis must be conducted once every ten days. Once signs of ignition appear, drainage must be stopped, and effective technical measures must be implemented to prevent spontaneous combustion.
Article 29: Gas drainage equipment must be installed according to design requirements. Drainage pipelines must be flat, stable, straight, and sealed. Before using the gas drainage system, a gas tightness test must be conducted, and records must be kept.
Installation of gas drainage pipelines:
① Main lines must be laid more than 0.3 meters above the bottom plate on the side wall of the roadway.
② Branch lines must be laid in the middle-upper part of the side wall or the top of the roadway. Drainage pipelines must not come into contact with electrified objects. When crossing transport roadways, the height from the rail surface must be no less than 1.8 meters, and the leakage per kilometer must be less than 3m³/min. During gas drainage, the connection or removal of drainage boreholes and pipelines must be carried out according to the relevant regulations for gas drainage measures. No unauthorized removal or connection is allowed. Non-active drainage boreholes must be tightly sealed with plugs to prevent gas leakage.
Article 30: A comprehensive inspection of the gas drainage pipeline system must be organized once a month during the mine's monthly safety inspection, and the inspection results must be recorded in detail in the pipeline inspection record book.
Chapter Four: Management Methods for Gas Drainage Pump Stations
Article 31: The construction of gas drainage pump stations (including mobile drainage pump stations) must comply with the requirements of GB50471-2008 "Design Code for Gas Drainage Projects in Coal Mines" and must be built using non-flammable materials.
Article 32: Gas drainage pumps must be powered by dedicated dual-circuit power supply lines, and the substation must have dedicated branch circuit breakers. The operation procedures and safety measures for gas drainage must clearly specify the measures to be taken when the pump temporarily stops running due to power outages or faults, and relevant units and personnel must strictly follow these measures.
Article 33: Gas drainage pump stations must be equipped with sufficient fire-fighting equipment, including dry powder fire extinguishers and sandboxes for firefighting. The pump station must have a direct telephone line to the mine dispatch room. Irrelevant equipment and materials for gas drainage must not be stored in the pump station, and there must be no water accumulation inside the pump house. Fire lanes inside and outside the ground drainage pump station yard must remain unobstructed.
Article 34: Operators of gas drainage pumps (gas drainage pump operators) are special occupations and must undergo specialized gas drainage technical training and work with certificates. Certificates should include: Special occupation technical training qualification certificate and special occupation job qualification certificate.
Article 35: Ground gas drainage pumps must be equipped with automatic power-off protection devices for water shortage. Relevant units must notify the mine dispatch room in advance if their work affects the water supply to the drainage pump station, and only proceed after approval. Gas drainage pump operators must frequently check the conditions of the drainage pump, drainage pipeline, safety facilities, water supply system, etc., and address any issues found promptly.
Article 36: The gas concentration in the drainage pump station must be checked at least three times per shift. The gas concentration in the pump house must not exceed 0.5%, and the gas concentration within 300mm of the machine body must not exceed 1%. Furthermore, methane monitoring probes must be installed in the pump station. When the gas concentration reaches 0.5%, all non-intrinsically safe electrical equipment power sources in the pump house must automatically cut off. A start-stop sensor must be installed on the power side of the gas drainage pump to monitor the operational status of the gas drainage pump in real-time.
Article 37: Gas drainage workers must summarize the working hours of the drainage pump, cumulative drainage volume, and parameters such as the negative pressure, temperature, concentration, carbon monoxide, and flow rate of the drainage pipe in a full shift and fill them into the “Hechang Coal Mine Gas Drainage Daily Report”. (The daily report should set up methane inspection items to take the maximum and minimum values of methane and carbon monoxide concentrations at each inspection point in a full shift.) After confirming the accuracy of the daily report, it must be submitted to the mine manager and the technical mine manager for review.
Article 38: The centralized gas drainage system on the ground must be equipped with a drainage monitoring system. The monitoring system should have the following functions:
1. It can operate independently and also run as a subsystem connected to the integrated monitoring system of the mine.
2. It can continuously monitor the negative pressure, concentration, temperature, carbon monoxide, and flow rate (pure flow instantaneous value, mixed flow instantaneous value, pure flow cumulative value, mixed flow cumulative value) of the drainage pipe in the pump house and underground, the water pressure, inlet and outlet water temperature, and water volume of the circulating water in the pump house, the pressure, concentration, tank height, water seal water level, and temperature of the gas storage tank, the temperature of the pump shaft, the gas concentration and equipment power supply status in the pump station environment, the water supply situation of the water supply pipeline, the water level of the water supply pool, the opening amount of the gas valve, current, voltage, and power.
3. It can automatically convert the measured parameters into mixed gas flow and pure gas flow under standard conditions and calculate the cumulative amount.
4. When the gas concentration in the pump house environment exceeds the specified limit, it can issue sound and light alarms and power-off control; when the gas concentration in the drainage pipe is lower than the specified value, it can also issue sound and light alarms and power-off control.
5. It has a forced interlocking power-off function where if the measurement points of any substation exceed the limit, another substation controls the power-off. The power-off logic can be set by the user.
6. The system analyzes and processes the collected data in real-time, queries and displays on the screen, prints, and forms corresponding historical statistical data, storing daily, decadal, and monthly reports.
7. The system has strong self-diagnosis functionality.
All the above gas drainage management systems must be organized for workers to learn and strictly enforced. Continuously summarize gas drainage experience and further supplement and improve according to national and coal industry standards and specifications.
Shanxi Liulin Xinfly Hechang Coal Industry Co., Ltd.
Year 2012