The advantages of ultrasonic external level gauge in liquefied gas (LPG) tank farm

1. Properties and applications of liquefied gas (LPG) Liquefied petroleum gas (LPG) can be divided into liquefied petroleum gas and liquefied natural gas. 'or 'liquefied gas', English abbreviation LPG. With the development of petrochemical industry, liquefied petroleum gas (LPG), as a basic chemical raw material and new fuel, has been paid more and more attention by people. LPG has the advantages of less pollution, high calorific value, easy transportation, stable pressure, simple storage and flexible supply. It can be used as industrial, civil and internal combustion engine fuel, and its composition is propane, n-butane, isobutane and a small amount of ethane, organic compounds greater than carbon 5, unsaturated hydrocarbons, etc. Liquefied petroleum gas is mainly used as petrochemical raw material for hydrocarbon cracking to ethylene or steam reforming to syngas. Liquefied gas has the characteristics of flammability and explosion, gasification, thermal expansion, retention, electrification, corrosiveness and suffocation. Gaseous liquefied petroleum is about 1.5 times heavier than air. The explosion range of the gas-air mixture is 1.7%~9.7%, and it will explode in case of an open flame. Therefore, it is necessary to prevent leakage when using it, and do not be paralyzed, so as not to cause harm. 2. Storage requirements of liquefied petroleum gas (LPG) According to 'GB 18218-2009 Identification of Major Hazardous Sources of Hazardous Chemicals', the critical quantity of liquefied gas is 50T, so the liquefied gas tank farm is regarded as a major hazard source. For the liquid level of the liquefied gas storage tank, there should be both a remote instrument and a local instrument. At the same time, the instrument used for interlocking should be set independently to enhance the reliability of detection and control. 3. Monitoring method of liquefied gas storage tank using externally attached liquid level gauge The externally attached liquid level gauge uses the principle of sonar distance measurement to measure the internal liquefied gas level from the outside of the storage tank, and the externally attached liquid level gauge realizes complete isolation. Measurement. The sonar sensor (probe) is installed just below the outer wall (bottom) of the liquefied gas storage tank, without opening the tank, the installation is simple, it can be installed online, and the measurement results can be displayed locally and transmitted to the control room. 4. Advantages of externally attached liquid level gauges in liquefied gas (LPG) tank farms The diameter of the sensor is only 800mm, and the blind area of ​​other domestic and foreign liquid level gauge manufacturers is more than 200mm. Such a large blind area cannot be measured for small storage tanks. 2. Non-contact measurement of liquid level, safe and easy to achieve true non-contact measurement, making installation and maintenance significantly easier. Most of the civil liquefied gas does not have a remote liquid level instrument, and now a set of remote liquid level instrument must be added, and the externally attached liquid level gauge is the best choice. 3. The installation and debugging are greatly simplified. The liquid level gauge is highly intelligent, and the on-site installation and debugging work is greatly reduced, realizing fool-like installation. There is no need for manufacturers to send after-sales installations in the past, which greatly saves costs. 4. Two-wire system with high precision, which greatly saves the cost of installation and use
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