LNG Low-Temperature Storage Tank Detailed Description:
The LNG storage tank is a horizontal double-walled structure, comprising an inner tank, an outer tank, internal and external supports, an insulating layer, a pressure safety system, a vacuum pump, and a piping system. All vacuum-insulated structures rely on vacuum. Due to the high degassing rate and suction resistance of the insulating space materials, and the inability to exceed the baking temperature of the sealing materials without causing slow degassing, suction is difficult. To achieve the required vacuum level within the design-specified vacuum time, in addition to the vacuum pump and suction process, it also relates to the flow area of the annular suction pipes. To ensure a high vacuum level and improve the suction rate, a vacuum pump is installed at both ends of the equipment. One vacuum pump consists of three suction pipes, placed in the lower half of the annular space and extending from the bottom, while the other vacuum pump, also with three suction pipes, is placed in the upper half of the annular space and extends from the top. The two sets of suction pipes cross and overlap along the length of the tank. By increasing the flow area of the suction pipes and using various auxiliary methods such as heating and nitrogen displacement, the vacuum acquisition time for the annular insulating space with a volume of 100 m³ is reduced to one-third of the conventional structure.
LNG storage tanks are essential containers at LNG fueling stations, an indispensable part of the infrastructure. As a professional in the LNG industry, do you truly understand them? Let's delve into a detailed introduction below:
1. Packaging Style
LNG storage tanks typically come in vertical and horizontal designs. Vertical tanks offer small land footprint, ease of use, and reduced power consumption for submersible pumps due to gravity differences, saving on electricity. However, vertical tanks usually exceed 10 meters in height, which can cause fear among surrounding residents, making them unsuitable for urban settings. Horizontal tanks are the most commonly used type, but they have the drawback of requiring a larger land area. Additionally, there are safety distance requirements between the storage tank and surrounding buildings and facilities both within and outside the station, which, according to GB50156, increases the design complexity.
2. Insulation form
Common insulation forms for LNG tanks include high vacuum multi-layer winding and pearl sand powder insulation. The latter is more common in practical applications due to its lower cost.
3. Materials
The container is made from high-quality Austenitic stainless steel 0Cr18Ni9 sheet or imported 304 sheet; the outer container is made from high-quality carbon steel Q345R plate.
4. Security Protection System
The safety protection system consists of tank accessories including: pressure gauges, level indicators, fully enclosed safety valves with one in use and one in reserve at the root, overflow ports, and bursting disks.
5. Filling Form
LNG tanks can be filled through the top or bottom. Top filling uses cold liquid to liquefy the BOG gas inside the tank. Both methods can be used, and the choice depends on the on-site conditions during the unloading process. It's quite complex and can't be explained in just a few sentences. Those with questions can private message for further discussion.
6Level Conversion
LNG液位换算质量容积及质量需要按照储罐厂家提供的数据，结合液厂的气质报告数据综合确定。
7Technical Requirements
General technical agreements require LNG tank design pressure0.8MPA, designed for temperatures down to -196°C, with a daily evaporation rate of no more than 0.20%. The actual working pressure of the tank is generally less than 0%.8MPA's, the operating temperature is generally determined by the liquid's quality, around -100°F.
A seemingly simple white storage tank, but there's a deep well to it. How to choose the right tank that minimizes investment while meeting usage requirements? How to properly utilize the tank to reduce losses at the gas station and cut down on maintenance costs? Feel free to message me for details.
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