Seeking advice on the types of wet gas tanks

Low-pressure wet gas cabinets are divided into three categories: vertical gas cabinets without external guides, vertical gas cabinets with external guides, and spiral gas cabinets. 1. Helical gas holder without external guide frame: HG/T21549.2-1995 specifies the series of specifications and dimensions for such gas holders; their volume ranges typically from 50 to 1000 m3, with a designed wind load of 500 Pa. In this design, the straight guide rails are fixed to the dome, while the upper guide wheels are installed on the water tank platform. Features of a helical gas holder without external guides: (1) Simple structure; the guides are easy to manufacture, eliminating the need for work at heights and reducing the complexity of construction ； (2) The manufacturing cost is lower than that of external guide frames, and it is comparable to that of spiral guides ； (3) The installation height is low, equal only to the height of the sink, making it easy and safe to install ； (4) The guide rails are under poor stress conditions, and track jamming or derailment accidents may occur during rapid lifting and lowering ； (5) It has poor overturning resistance, and is not suitable for use in typhoon-prone areas or regions with high seismic intensity ； (6) Generally used for small-diameter single-valve gas cabinets. 2. Helium storage tanks with external guide frames: HG/T21549.3-1995 specifies the series specifications and dimensions of such tanks, which range from 200 to 30,000 m3. The designed wind load is 850 Pa. Helical gas tanks with external guides have the following characteristics: (1) Good resistance to overturning, suitable for areas with high seismic activity ； (2) The production and installation of guide rails are relatively easy ； (3) The outer guide frame is tall, which poses problems related to working at heights during construction, increasing the difficulty of the work; therefore, necessary safety measures must be taken ； (4) Due to the installation of external guides, the steel consumption for gas tanks increases; the steel usage is 15%~25% higher than that in spiral-type tanks, making it suitable for large, medium, and small gas tanks. Since more steel is required for spiral gas tanks, they are the preferred choice when wind and seismic loads are not very high. The maximum volume that can be achieved with this series of gas tanks is 30,000 m3. 3. Spiral gas holder: It involves fixing spiral guides on the walls of the bell-shaped cover as well as on the walls of other movable tower sections; spiral idlers are installed on the platforms of the water tank and those of the movable sections. During operation, the spiral guide wheel keeps the spiral guide rail within a 45° track, allowing only the movable joint to move upward or downward in a spiral direction, thereby ensuring the proper functioning of the gas tank. HG/T21549.4-1995 specifies the series specifications and dimensions of gas tanks, ranging from 1000 to 100,000 m3. The designed wind load is 500 Pa. Features of spiral gas tanks: (1) There are no external guides, resulting in less steel usage; the larger the gas tank, the more material can be saved ； (2) The installation height is low, equal to that of the sink, making it easy and safe to install ； (3) Although its anti-tilt performance is not as good as that of the external guide frame helical guide rails, it still maintains good stability once raised ； (4) The guide rails are difficult to machine, and high precision is required in their manufacturing and installation ； (5) Widely used in large, medium, and small gas tanks. The capacities of spiral gas tanks generally range from 10,000 to 50,000 m3, with the largest capacities currently reaching 100,000 m3.