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On June 27, 2022, a tank containing 25 tons of liquid chlorine ruptured and leaked at the Port of Aqaba in Jordan, resulting in at least 14 deaths and 265 injuries. The following day, the Ministry of Emergency Management of the People’s Republic of China issued a notice stating that provincial emergency management departments and relevant central state-owned enterprises should earnestly learn from the lessons of this accident, and by July 30th conduct a review of the safety measures in place at liquid chlorine storage sites, in accordance with the \"Liquid Chlorine Safety Risk Assessment Form\". http://www.dhechina.com/ueditor/php/upload/image/20220718/1658108723549514.png In the “Liquid Chlorine Safety Risk Assessment Form”, item 7 states clearly: “The liquid level gauges for liquid chlorine storage tanks should be of two different types – one set for on-site display and another set for remote monitoring. The remote monitoring gauge should preferably be an external type of level gauge that measures the level from outside the tank.” ” “The recommendation that remote-level measurement instruments for liquid chlorine storage tanks should use external-type level gauges is not new. As early as 2010, the China Chlor-Alkali Industry Association provided clear guidelines on the selection of \"remote liquid level display instruments\" in its \"Guidelines on Chlorine Safety Facilities and Emergency Response Technologies\". http://www.dhechina.com/ueditor/php/upload/image/20220718/1658108810494496.jpg \"Guidelines on Safety Facilities and Emergency Response Techniques for Chlorine\" (China Chlor-Alkali Industry Association [2010] Document No. 070) Article 1: Liquid chlorine storage tanks, as major hazard sources in the chlor-alkali production process, are subjects of close monitoring due to their status as hazardous chemicals. Since liquid chlorine is highly toxic and can cause poisoning upon inhalation, as well as possessing strong irritating and corrosive properties, it is crucial to choose instruments that are safe, resistant to corrosion, and leak-proof. External-type level gauges feature no need for drilling holes, no tank cleaning required, no use of fire, and non-contact measurement. They do not cause blockages during operation nor are they affected by volatilization, making them the ideal choice for measuring liquid chlorine storage tanks! Application of external level gauges in liquid chlorine storage tanks – Dongying Hebang Chemical Co., Ltd. Measured medium: liquid chlorine; Operating conditions: tank parameters φ3000*13100/100 ； Cylinder material: 16MnR (low-alloy steel) ； Design temperature -30°C-50℃ ； Pressure: 1.63 MPa. Product selected: ELL® sonar external level gauge. Original plan: Before the improvement, the company used radar level gauges, but the measurement results were unstable. Since liquid chlorine is a liquefied gas, there is a phenomenon of wave loss during radar transmission and reception. Moreover, the presence of chloride sludge in liquid chlorine causes it to stick to the antenna, affecting the transmission and reception of radar waves; therefore, radar level gauges are not the best choice. After improvements: The company visited more than a dozen chlor-alkali enterprises across the country, and after numerous evaluations by design institutes and industry experts, it ultimately opted for the ELL® sonar-type external level gauge – a device that allows for the measurement of liquid level in chlorine storage tanks without the need to make any holes in those tanks. This prevents accidents such as leakage, dripping, escaping fluid, and seepage caused by too many openings, thereby improving the level of safety management ； Furthermore, since there is no need for contact with the medium, installation and maintenance are also very convenient, ensuring the safety of instrument maintenance personnel. http://www.dhechina.com/ueditor/php/upload/image/20220718/1658108850591263.jpg Measurement medium at Xingtai Mining Group’s Jinniu Potash and Alkali Branch: liquid chlorine. Operating conditions: temperature of -25℃ ； Pressure 0.2MPa-1.6MPa ； Range: 0~2200mm ； With a viscosity of 0.6 mPa·S, the product selected was the ELL® sonar-type external level gauge. After a 24V DC power supply was provided on-site, the manufacturer carried out the installation online; it took only half a day to complete the installation without disrupting the normal operation of the equipment, after which the gauge was ready for use. After six months of data testing, the instrument has shown stable performance and accurate measurements, fully meeting the requirements for level measurement and control. http://www.dhechina.com/ueditor/php/upload/image/20220718/1658108916964910.jpg The ELL® sonar external level gauge is a device that uses the principle of sonar ranging and \"micro-vibration analysis\" technology to measure the liquid level from outside the container. It requires no holes to be made in the tank wall, no flanges, and no need for welding or cleaning of the tank; it also does not come into contact with the liquids or gases inside the tank. It can be installed and maintained online, making it a completely non-contact, isolated type of gauge. http://www.dhechina.com/ueditor/php/upload/image/20220718/1658108963943495.jpg Over the past 30 years, Dinghua Electronics has been continuously developing, improving, and upgrading its products to ensure that its technologies and products remain at the leading level both domestically and internationally. The ELL® sonar external level gauge has earned high praise from users across the world for its advanced technology, high stability, high precision, high safety, intelligent interface, and low maintenance requirements, making it the preferred instrument for measuring liquid chlorine storage tanks!