How much do you know about the basics of stainless steel LPG storage tanks?

Stainless steel LNG tanks are made of tempered material, boasting strong resistance to acidity and alkalinity, and are designed to meet public satisfaction based on the influence of external environments on the tanks. They are highly popular in both daily life and social venues. These tanks are primarily composed of natural gas pretreatment processes, liquefaction processes, storage processes, control systems, and fire protection systems, thus avoiding the drawbacks of outdated tanks and representing a new, satisfying product.

Stainless steel LNG tanks are containers primarily used for storing liquefied natural gas, mainly suitable for residential kitchens, automotive fuel, and chemical plants. These tanks come in various sizes for convenience, allowing users to choose according to their specific needs. Generally, tanks ranging from 5 to 50 cubic meters are ideal for residential use or gas stations. Those from 50 to 100 cubic meters are commonly used in satellite liquefaction systems and large-scale industrial applications. These LNG tanks possess different characteristics, making them suitable for installation in various regions, thereby enhancing our daily lives.

Insulation methods for the protective structure of LNG tanks

1. The true vacuum powder insulation method for LNG storage involves evacuating the sandwich layer of the LNG tank, filling it with powder (talcum powder), commonly used in small LNG tanks. Vacuum powder insulated tanks are popular due to their production technology being similar to that of liquid nitrogen and liquid oxygen tanks, making the manufacturing technology of domestic producers very mature. Since the operation and maintenance of LNG tanks are relatively convenient and flexible, they are widely used. Most domestic LNG gasification stations use 50m3 and 100m3 cylindrical double-metal vacuum powder LNG tanks. Currently, they can be as large as 200m3, but due to their large size, transportation is difficult, and they are generally less used. Vacuum powder insulated tanks are also available in spherical shapes, but their usage range is typically 200-1500m3, and the installation of spherical tanks is challenging on-site.

Positive Pressure Insulation Accumulation

Insulated with thermal materials, the sandwich structure is permeated by nitrogen gas. The insulation layer is typically thick and widely used in large and medium-sized LNG storage tanks and containers. Usually in vertical LNG mother-daughter storage tanks.

3. High vacuum multi-layer insulation.

Utilizing high-vacuum multi-layer wrapped insulation, commonly used in tank trucks. The cylindrical double-metal vacuum powder LNG storage tanks are commonly used in domestic LNG liquefaction stations. Considering that vertical tanks save space and have a larger static head of LNG, which is beneficial for the operation of the self-increaser, vertical double-metal vacuum powder LNG storage tanks are adopted. The station's LNG storage capacity is not large, but the refrigeration performance requirements are high, thus high-vacuum multi-layer wrapped insulation storage tanks are chosen. Based on the LNG storage capacity and considering the ease of transportation for modular equipment, a horizontal 50m3 storage tank is selected for LNG transfer. Each LNG storage tank is equipped with a level gauge, differential pressure transmitter, pressure transmitter, temperature transmitter, and pressure gauge to provide on-site indication and remote control of the LNG level, temperature, and pressure inside the tank. Safety explosion-proof devices are installed at the top of the tank, and a sandwich extraction port and temperature testing port are set at the bottom. The design pressure of the inner tank is determined to be 1.2MPa and the outer tank's design pressure is -0.1MPa, based on the system's working pressure and considering economic factors.

Important Notes for LNG Tanks

1. Safe Operation of LNG Tanks: mm_+0 To prevent over-temperature and over-pressure phenomena in LNG tanks, the usage pressure and temperature should be controlled. The causes of over-temperature and over-pressure in LNG tanks include the following:

(1) Operation Errors - To prevent operation errors, labels should be affixed to critical operation devices, clearly marked with symbols or text indicating the opening and closing directions of valves, their on/off states, and precautions, etc.

(2) Overfilling of Liquefied Gases Preventive measures against overfilling include: strictly filling to the specified storage volume; upon discovering overfill, immediately attempt to remove the excess; all gauges used for filling must be regularly inspected, and level gauges should be periodically flushed; any residual liquid in the container should be included in the filling volume; do not ignore its weight; when the surrounding temperature rises, spray cooling should be performed.

2. Maintenance and care for LNG tanks:

1. Cylinders must be stored in well-ventilated areas, with a distance of no less than 1.5 meters from any fire or heat source. Cylinders should not be heated with fire, scalded with boiling water, or left exposed to direct sunlight. Regularly check the gas tightness of cylinder valves and pipeline joints, ensuring no leaks. Typically, leaks are checked using soap water, and it is strictly prohibited to test for leaks with an open flame.

LNG储罐厂家 

Low-temperature Storage Tanks, Liquid Oxygen Storage Tanks, LNG Storage Tanks, Liquid Nitrogen Storage Tanks, Carbon Dioxide Storage Tanks, Low-Temperature Vessels, Liquid Oxygen Vessels, LNG Vessels, Pressure Vessels, LNG Filling Station Equipment

Product Features: Well-designed, high safety performance, easy to operate and maintain. The design phase fully considers equipment safety, while also aiming to reduce manufacturing costs, saving users' funds.

Application Range: Suitable for industrial gas stations, LNG fueling stations, LNG liquefaction stations, centralized gas supply for gas boilers, and centralized gas supply equipment for enterprise use. Custom manufacturing available according to customer needs.

LNG Tank Operation and Maintenance Procedures

I. LNG Unloading Procedure

Note: (Example: 1# LNG Storage Tank Inlet)

1. Inspect that the pressure gauges, level indicators, thermometers, flammable gas detectors, and safety valves on the LNG tank car unloading platform and within the 1# LNG storage tank area are functioning normally.

2. Verify that valves C-8, G1-5, G1-11, G1-13, G1-15, B-1, and B-2 are in the open position, and that valves G1-8, C-1, C-2, C-3, C-4, C-5, C-6, and C-7 are closed. Check that the bolt securing the root valve of the LNG tank is tight and the flange joints are intact; if loose, tighten immediately.

3. Prior to entering the station, the LNG tanker must raise the static electricity grounding wire. Once inside, the LNG tanker's speed must not exceed 5 kilometers per hour, and it must park in the designated location, turn off the engine, remove the key, pull up the handbrake, close the doors securely, place the wooden chocks, and connect the static electricity grounding wire. Install the LNG tanker loading and unloading hoses: 1. The LNG tanker (Xinjiang Guanghui) connects the liquid phase outlet of the self-pressurized LNG tanker with the liquid phase inlet of the gasifier; the gas phase inlet of the LNG tanker connects with the gas phase outlet of the gasifier; the liquid phase outlet of the LNG tanker connects with the LNG pipeline. 2. The lower liquid inlet and outlet of the LNG tanker (XinAo Anruike) connect with the LNG pipeline, and the gas phase pipeline connects with the BOG pipeline.

4. The pressure of LNG tankers should be maintained between 0.55-0.7 MPa. When the pressure of LNG tankers falls below 0.55 MPa, the self-pressurization system of the LNG tanker or the vaporizer on the unloading platform should be activated for pressure increase.

5. Open valve G1-8 to pre-cool the incoming liquid pipeline using LNG from the storage tank.

6. After pre-cooling is completed, open valve C-2, activate the LNG tanker's liquid discharge valve, and fill the LNG storage tank with LNG by simultaneously filling from both the bottom and top. The opening of valve C-2 is determined on-site based on the filling rate of Tank No. 1.

7. When the pressure difference between the LNG tanker and the LNG storage tank is less than 0.1 MPa, open valve G1-14 to depressurize the LNG storage tank, or activate the LNG tanker's self-pressurization system or the tanker unloading platform's gasifier to increase pressure on the LNG tanker, maintaining a pressure difference of 0.2 MPa between the LNG tanker and the LNG storage tank is recommended. During the depressurization process of the LNG storage tank, the pressure after the pressure regulator should be strictly controlled and must not exceed the pressure regulator's cut-off pressure.

8. After confirming that the LNG in the LNG tanker has been unloaded, close valve C-2 and open valve C-3 to depressurize. When the LNG tanker is connected to the city...