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　　1、 How to do a good job in equipment management for LNG refueling station equipment

　　To do a good job in equipment management for LNG refueling stations, the first step is to establish and improve the equipment management system to ensure more scientific and effective operation of station equipment management. Carry out safety hazard inspections of station equipment and facilities, as well as maintenance and upkeep of equipment and facilities, comprehensively improve the professional and technical level of equipment maintenance management personnel and the operational level of operators.

　　1. Develop rules and regulations for the management of various equipment in the station, and establish an equipment management system

　　(1) LNG refueling station equipment should establish a sound organizational structure

　　In order to do a good job in the equipment safety management of LNG refueling stations, the first step is to establish and improve the equipment management organizational structure of the station, with clear responsibilities, specific division of labor, and each person fulfilling their own responsibilities, and conscientiously carrying out equipment safety management work according to requirements. This is the framework and organizational guarantee of enterprise equipment management. The equipment management organizational structure of the station is the leading core of the overall equipment management, responsible for important tasks such as technical guidance, equipment fault analysis, equipment management assessment, and formulation of equipment maintenance and repair work plans. It is necessary to establish a top-down equipment management organization for LNG refueling stations to ensure scientific management of equipment maintenance and upkeep.

　　(2) LNG refueling stations should establish various equipment management regulations and technical specifications

　　The management of LNG refueling station equipment should be based on laws and regulations, and feasible. Every operation and maintenance of the equipment should be strictly carried out in accordance with the equipment safety operating procedures, so as to ensure the safe operation of the station's equipment. In order to gradually achieve standardization and institutionalization of equipment management, and move from experience management to scientific management, LNG refueling stations should formulate various technical specifications such as equipment management rules and regulations, equipment safety operation procedures, etc. Standardize all equipment operations with rules and regulations, and guide the operation, maintenance, and repair of equipment with operating procedures and technical specifications.

　　(3) LNG refueling stations should establish and improve equipment basic technical archives. The establishment and improvement of equipment basic technical archives is the foundation of equipment management, which is the technical record of the entire process monitoring from equipment design, selection, use, fault handling, maintenance to elimination. It is the technical summary and record of the entire life cycle of equipment, and has very important guiding significance for equipment safety management. Therefore, LNG refueling stations should establish and improve various equipment technical files, equipment ledgers, special equipment safety management, fixed asset ledgers for mechanical equipment throughout the plant, revise and improve equipment safety operating procedures, and do a good job in equipment inspection and maintenance, as well as archiving technical data for daily and regular maintenance management of equipment.

　　2. Carry out maintenance and upkeep of LNG refueling station equipment and facilities

　　According to the operation status of gas station equipment and facilities, a scientific and reasonable maintenance plan for equipment and facilities should be formulated and scientifically organized for implementation. Especially for the core equipment of LNG refueling stations, such as LNG low-temperature storage tanks, gasifiers, low-temperature pumps, instruments, etc., key daily and regular maintenance should be carried out to ensure that the equipment and facilities are put into production in good condition and ensure the safe operation of LNG refueling stations.

　　2.1 Maintenance of Low Temperature Storage Tanks

　　(1) Measurement of vacuum degree between inner and outer layers (with a cycle of one year).

　　(2) Daily inspection of supporting facilities for storage tank equipment: fire sprinkler pipes on the outer wall of the storage tank, lightning protection, and anti-static grounding wires are intact.

　　(3) The foundation of the storage tank should be regularly observed to detect any sinking or damage, and any problems should be reported and dealt with promptly.

　　(4) The safety valve should be inspected regularly to observe for frost and condensation. After the safety valve on the storage tank trips, it needs to be rechecked.

　　(5) The outer surface of the storage tank should be regularly inspected for any abnormal phenomena such as deformation, corrosion, frosting, and condensation. Any problems found should be reported and dealt with in a timely manner.

　　(6) The liquid level of the storage tank should be within the normal storage range, with an upper limit of 85% and a lower limit of 15%.

　　(7) There are pressure gauges and differential pressure level gauges on the storage tanks, with on-site indication and remote transmission. Remote transmission is used to collect and transmit automatic control data to the central control room, and regular testing and calibration are required. The liquid level gauge and storage tank capacity should be adjusted based on the density of the storage medium.

　　(8) The valve connected to the storage tank shall not be used as a control valve for incoming and outgoing materials, and frequent opening and closing is not allowed. It should be kept in a normally open state, regularly switched on and off, and kept flexible and easy to use. Because it is difficult to replace the valve.

　　(9) After a period of use, low-temperature valves may experience liquid leakage. If a slight leakage is found on the upper cover, the packing cover should be tightened. If the valve core cannot be closed, the valve core should be replaced. It is strictly prohibited to add oil and clean the low-temperature valve with water.

　　(10) No substance shall be placed around the storage tank to obstruct pedestrian pathways and operations, and the site shall be kept clean.

　　2.2 Maintenance of Low Temperature Pump

　　(1) Carry out daily maintenance and upkeep of the low-temperature pump, check whether the lubricating oil level and quality of the low-temperature pump meet the requirements.

　　(2) Check if the low-temperature pump is running normally, if there are any abnormal noises, and if there are any leaks.

　　(3) Regularly carry out maintenance and repair work on the pump, and perform maintenance and inspection according to the technical specifications and operating conditions.

　　(4) The low liquid level of the low-temperature storage tank to the liquid level of the pump inlet pipeline should be maintained at a height of at least 3 meters.

　　(5) Pay attention to the protection of the pump casing and the cleaning of the pump casing.

　　(6) The frosting on the outer shell and outer wall is suspected to be a vacuum leak (frosting on the top after the pump is started is normal). Vacuum degree testing can be performed on the outer wall, but the vacuum degree testing hole should not be opened normally.

　　2.3 Maintenance of gasifier

　　(1) Usually, attention should be paid to the welds and fins to see if there are any cracks. Special attention should be paid to the welds between the low-temperature liquid inlet pipe, fins, and low-temperature liquid manifold.

　　(2) The static grounding of the gasifier should be completed and regularly tested for grounding.

　　(3) The outer surface of the gasifier should be kept clean, and no substance should be placed on top of the gasifier.

　　(4) The foundation of the gasifier should be regularly observed to detect any sinking or damage, and any problems should be reported and dealt with in a timely manner.

　　(5) If the gasifier has a large gasification volume during operation and excessive frosting is found, it should be dealt with in a timely manner.

　　(6) The use of gasifiers should be switched regularly.

　　2.4 Maintenance of Instruments and Meters

　　Regularly inspect, adjust and calibrate instruments and meters.

　　Check whether the instrument readings and records are normal, and whether the on-site instrument readings are consistent with the instrument readings displayed in the control room.

　　Keep all wiring pipes and boxes of instruments and meters intact and well grounded.

　　Check the damage and corrosion of the instrument body and connectors, and whether there is any leakage at the joints.

　　Instruments and meters should be kept clean regularly, wiped clean with soft cotton yarn during maintenance, and checked for any abnormal appearance.

　　The force gauge, differential pressure transmitter, and pressure transmitter should be regularly drained to prevent impurities from accumulating in the pressure tapping tube, which directly or indirectly affects the measurement.

　　3. Carry out safety hazard inspection of LNG refueling station equipment

　　In response to the flammable, explosive, and low-temperature characteristics of LNG station sites, there are hazards such as heat leakage or insulation damage, liquid level exceeding operation, vortex or rolling in low-temperature storage tanks during long-term production and operation of equipment and facilities; Low temperature storage tanks and their connections, valves, pipelines, etc. are prone to fire and explosion accidents caused by leaks. The equipment and facilities of LNG storage tanks, as well as the issue of static grounding in pipelines, are also important causes of accidents. Therefore, LNG refueling stations should regularly and irregularly carry out hidden danger inspections of equipment and facilities. For existing hidden dangers, designated personnel, quality, quantity, and timing should be used to complete rectification and elimination. Special real-time inspection, monitoring, and calibration of key equipment and facilities such as low-temperature storage tanks, valves, pipelines, and safety protection instruments and meters.

　　4. Strengthen the management of special equipment for LNG refueling stations

　　Low temperature storage tanks, filters, pipelines, etc. in LNG refueling stations are all special equipment. According to the "Special Equipment Safety Supervision Regulations" and "Capacity Regulations", LNG refueling stations should do a good job in managing special equipment in the station. LNG stations should establish a comprehensive safety management system for special equipment, establish technical files for each special equipment, carry out daily maintenance and inspection of special equipment, and regularly conduct comprehensive inspections of special equipment. According to relevant national laws and regulations, each special equipment must obtain a certificate of use before it can be put into use. Special equipment such as pressure vessels and pressure pipelines, as well as their safety accessories, must be inspected and tested regularly. Daily and regular inspections of special equipment must be carried out, and the operation status and corrosion situation of special equipment such as pressure vessels and pressure pipelines must be monitored, inspected, and maintained.

　　5. Comprehensively improve the business and technical level of LNG refueling station equipment management personnel

　　Gas stations can improve the business and technical level of equipment management personnel, operators, and equipment maintenance management personnel by strengthening job training, job rotation, further education, skill competition, on-site training, typical accident case learning, etc., enhancing their sense of responsibility, respect for their work, and safety awareness, thereby ensuring the safe operation of station equipment. The technical level of station equipment management personnel determines the quality of station equipment safety management work, in order to do the work better, standardized, and scientifically.

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