1.2.3 LNG Storage Tank Gas Supply Process:

All valves of the storage tanks to be pressurized are closed, with the exception of the root valve and the emergency shutdown valve.

2. Open the low-temperature tank's lower inlet valve, as well as the liquid and vapor pressure valves, and check that both valves in front and behind the pressure vaporizer are in the open position.

3. Open the low-temperature cutoff valve before the gasifier, the normal temperature flange ball valve after the gasifier, and all valves required to be opened in the pressure regulating system.

4.A. A single storage tank is sufficient to meet the gas supply requirements when the gas supply volume is less than 1000-2000 Nm3/h.

5. Flow Rate:

5.1 When the tank pressure exceeds the outlet pressure by more than 0.15 MPa, gradually open the liquid outlet valve to initiate the gas supply operation.

5.2 Record the liquid storage tank number and the start of gas supply time.

5.3 Pay close attention to the liquid level, pressure changes, and flow and pressure variations at the exit in the gas supply process.

1.2.4 LNG Tank Self-pressurization Operation Procedure

1. During manual operation, open the valves: the boost liquid phase valve, the boost gas phase bypass valve, and the vaporizer inlet valve, allowing LNG to flow directly into the self-boosting vaporizer. After vaporization, it enters the LNG storage tank. At this point, closely monitor the pressure; close the boost liquid phase valve when the pressure in the LNG storage tank reaches the required level.

2. Cautionary Notes:

(1) During operation, the LNG low-temperature storage tank must maintain a maximum liquid level of ≤90% and a minimum liquid level of ≥15%.

(2) When manually operating the self-pressurizing system, the site must be kept unattended.

(3) When the self-pressurizing system is in operation, the pressure-reducing system should be in the off position.

3. Cautionary Notes:

(1) During operation, the LNG tank must maintain a liquid level of ≥15%.

(2) During manual operation, the site must be strictly attended at all times.

1.2.5 Risk Analysis and Countermeasures

When loading and unloading LNG tankers, operators should wear masks, static-free work clothes, and antifreeze gloves, etc.

2)Absolutely no vehicle movement is allowed during LNG tank truck unloading to prevent the tank truck from pulling apart the loading/unloading hoses, which could lead to a large amount of LNG leakage.

3) When there is LNG inside the pipeline, the valves at both ends cannot be closed simultaneously.

4) Absolutely no touching or stepping on low-temperature pipelines and facilities.

6) Under no circumstances shall moisture, oil, mechanical impurities, etc., enter the pipeline to avoid blockage.

7) Absolutely no hammering, fire drying, or water spraying on the frozen areas.

8) To ensure the safety of the working environment, operators must wear protective gear. Static electricity from the human body must be eliminated before entering the station. Open flames are strictly prohibited within the station's operational area, as well as the use of non-explosion-proof tools and electronic devices.

9) Strictly adhere to the operation ticket system, following the steps outlined in the ticket. On-site operators must consist of at least two people: one to perform the operation and another to supervise, ensuring safety throughout the process.

10) Conduct safety education before operation, implement on-site safety precautions effectively. In case of danger, know how to evacuate and control the situation.

1.2.6 LNG Tank Maintenance and Care Procedures

Operation technicians at liquefied natural gas stations must be familiar with the structure and principles of the storage tanks and strictly follow the operational procedures for liquefied natural gas-related activities.

2. Operators of liquefied natural gas must be familiar with the performance and principles of the tank accessories (pressure gauges, level gauges, temperature gauges, vacuum test valves).

3. The outer cylinder of the Liquefied Natural Gas tank is an externally pressurized vacuum vessel; welding operations are strictly prohibited under negative pressure.

4. Regularly inspect the outer cylinder of the storage tank for signs of icing or frost formation. Upon discovery, promptly report to the on-duty supervisor and station master. The on-duty supervisor or station master should immediately contact the manufacturer to identify the cause and initiate immediate action. Throughout the process, closely monitor any changes in the icing or frost. If there is a tendency for the incident to escalate, immediately proceed with tank draining or halt the filling operation, and close the relevant emergency shut-off valves at the inlets and outlets.

5. Regularly inspect the storage tank's connecting pipes, valves, etc., for frost formation. Report any issues to the on-duty supervisor immediately, who will then arrange for personnel to address the situation.

6. Regularly inspect the tank's pressure gauge, level gauge, and thermometer to observe if the readings are normal.

7. Regularly inspect the sealing performance and operation of the connecting valves to ensure normal functioning.

8. Regularly inspect safety valves, pressure gauges, level gauges, and thermometers according to regulations to ensure proper operation and promptly update the equipment inventory.

9. Regularly perform anti-corrosion treatments on the storage tank's outer shell and maintain the appearance by cleaning the pressure gauge, level gauge, and thermometer of the tank.

10. Regularly perform rust removal and anti-corrosion treatment on the easy-to-rust areas of storage tanks, such as pressure gauges, level control instruments, and three-way valves.

11. Conduct vacuum level tests on the tanks annually or as operational conditions dictate to monitor their performance.

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