1.2.3 LNG Storage Tank Gas Supply Process:

All valves of the tanks to be pressurized are closed, except for the root valve and the emergency shutdown valve.

2. Open the low-temperature tank's lower inlet valve, as well as the增压 liquid and vapor valves. Check that both valves of the booster vaporizer are in the open position.

3. Open the low-temperature cutoff valve before the gasifier, the normal temperature flanged 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 rate is less than 1000-2000 Nm3/h.

5. Liquid Output:

5.1 When the tank pressure exceeds the outlet pressure by more than 0.15MPa, slowly 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.

5.3 Pay close attention to the liquid level, pressure changes, and flow and pressure variations at the outlet of the storage tank during gas supply.

1.2.4 LNG Storage 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 directly enter 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 ensure a liquid level of ≤90% at the high limit and ≥15% at the low limit.

(2) When manually operating the self-pressurizing system, unauthorized personnel must not leave the site.

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

3. Cautionary Notes:

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

(2) When operating manually, it is strictly prohibited to leave the scene unattended.

1.2.5 Risk Analysis and Countermeasures

1) When loading and unloading LNG tankers, operators should wear masks, static-proof work clothes, and anti-freezing gloves, etc.

2) During LNG tanker unloading, the vehicle must not move to prevent the disconnection of the loading and unloading hoses, which could lead to a large LNG leak.

3) When LNG is present in the pipeline, both ends' valves cannot be closed simultaneously.

4) No touching or stepping on low-temperature pipelines and equipment.

6) Under no circumstances should moisture, oil, or mechanical impurities enter the pipeline to prevent blockages.

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 properly. Static electricity from the human body must be neutralized 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. The on-site operation requires at least two personnel: one to operate and one to supervise, ensuring operational safety.

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

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