Introduction to three-wall fully metallic pressure vessels

Thread Content

This post was last edited by Zhongyuanren on 2026-1-27 at 16:02. Introduction to three-wall metal full-volume tanks: Three-wall metal full-volume tanks are advanced storage vessels used for storing liquefied natural gas (LNG), and their design features high safety and reliability123. The following is a detailed introduction to the three-wall metal full-volume tank: I. Structural composition 1. Three-layer metal walls: It consists of a main container, a secondary container, and an outer container. The main container and secondary containers are usually made of stainless steel, while the outer container is made of carbon steel2. 2. Insulation layer: Insulating materials such as pearlescent sand are filled between the inner and outer layers to reduce heat loss. 4. 3. Support structure: Includes the tank bottom, tank top, and support system to ensure the stability of the storage tank. 4. Auxiliary facilities: built-in submersible pumps, instrument piping systems, safety relief platforms, etc., for monitoring and operation 1. II. Working Principle 1. Normal operating condition: The main container stores LNG, while insulating material is filled between the secondary container and the outer container to prevent heat loss1. 2. Leakage condition: If the main container leaks, the secondary container can hold the leaked LNG to prevent leakage of the liquid, while the outer container provides additional protection. III. Advantages 1. High safety: The three-layer structure provides multiple levels of protection; even if the inner tank leaks, the secondary and outer tanks can still prevent LNG from leaking23. 2. Good thermal insulation: The interlayer is filled with insulating material, which effectively reduces heat loss and improves storage efficiency. 4. 3. Easy maintenance: The structural design facilitates inspection and maintenance, reducing maintenance costs. 4. IV. Construction Challenges 1. High welding requirements: Storage tanks are made of various materials, and the welding process is complex; strict quality control is necessary.56 2. Insulation installation is complex: The filling and sealing of insulation materials in the interlayer require high standards, making the installation process more difficult14. 3. Long construction period: Due to the complex structure, the construction period is long, requiring meticulous management. 56 V. Application Examples 1. Nanjing Binjiang LNG Storage and Distribution Project: 60,000 cubic meter triple-wall metal full-volume tanks are used to enhance the city’s natural gas supply capacity during winter. 2. Jinan Nancaofan LNG Peak Shaving Storage and Distribution Station: It features the largest three-metal full-volume tank in Shandong Province, with a capacity of 40,000 cubic meters, thereby increasing natural gas storage capacity by 67%. 3. Xi’an Qinhua Natural Gas LNG Emergency Peak-Shaving Station: The first facility in China to use fully metal-lined tanks, enhancing the capacity for emergency natural gas supply by 2. In summary, three-wall metal full-containment tanks play a vital role in the LNG storage sector thanks to their excellent safety and reliability, providing a strong guarantee for the stability and security of energy supply.