Comparison of liquid level gauges commonly used in spherical tanks

The spherical tank has good compression resistance. Compared with the vertical type, the thickness of the tank wall is only half of that of the cylindrical container when the diameter and pressure are the same. , cost-effective, one of the most commonly used storage tanks. Spherical tanks are mostly used to store liquefied gas, liquefied petroleum gas, liquid ammonia, VCM monomer, etc. The medium exists in a gaseous state at normal temperature and pressure, and it needs to be turned into a liquid state by pressurizing and cooling during storage, which can greatly increase Improve storage efficiency. At the same time, it also puts forward higher requirements for the selection of liquid level gauges. Measuring the liquid level of a spherical tank requires that the liquid level gauge be suitable for large-scale measurement and must have pressure resistance. The change of pressure in the tank will not have an excessive impact on the stability and accuracy of its measurement; secondly, the purity of the medium The influence of , crystallinity and impurity content on the measurement of the liquid level gauge also needs to be considered; in addition, the method and speed of feeding and discharging materials, and the influence of the volatility of the medium on the liquid level measurement should also be considered. Therefore, considering the above factors, the following liquid level gauges should be used for the liquid level measurement of the spherical tank: 1. Servo liquid level gauge Archimedes principle + electromagnetic principle Advantages: insensitive to pressure changes; high precision, up to ±0.5mm , when the measuring medium is pure and the feeding and discharging speed is slow, it can be used as a metering-grade instrument; it can measure multi-layer interfaces. Disadvantages: need to open the tank top; need to obtain the density of the medium in real time, the density change will cause buoyancy changes, resulting in different heights of the float immersed in the liquid level, resulting in measurement errors; need to install a waveguide in the tank, and the inner wall of the waveguide needs to be flat. It is very high, otherwise it will affect the movement of the float; it is not suitable to measure the viscous medium, which may cause the float to get stuck in the guide tube and break the connecting wire. 2. The principle of electromagnetic wave reflection of radar level gauge Advantages: non-contact measurement, high precision Cylinder point: need to measure the opening of the tank top WEKA, Cologne, IA in Germany, K-tek in the United States, as well as Tokyo Gaijin and hundreds of domestic brands in Japan. Advantages: Intuitive, easy to install, low cost. Disadvantages: When the pressure in the tank changes, the pressure in the connecting pipe inside the tank and outside the tank is unbalanced, resulting in measurement deviation; there is no remote transmission level, and after improvement, multiple reed switches are used for remote transmission, and a certain amount of reed switches is required. Distance, liquid level remote transmission accuracy is low; connecting flange holes, magnetic floating ball, the maintenance amount is increased when the measurement medium is dirty, and it is not easy to clean the tank during maintenance. 4. Principle of sonar echo ranging of ultrasonic external level gauge Sonar echo ranging technology is a technology that uses the propagation and reflection of sound waves in the medium to achieve ranging through the relationship between time, speed and distance. Advantages: During installation and maintenance, no holes, no fire, unclear tanks, and no production. Automatic calibration accuracy; not affected by the pressure in the tank, the maximum range is 30 meters; safe and reliable; disadvantages: cannot measure liquid media with high viscosity; liquids that produce a lot of bubbles or solid particles cannot be used; the maximum measurement temperature range -60 ~ 220 °C. Related product links: Ultrasonic external stick liquid level gauge 31.html80G radar level gauge 922.html

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