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What Are the Quenching and Liquid Hammering of LNG Storage Tanks?

Aug. 16, 2019

The LNG storage tank is a storage tank specially used for storing liquefied natural gas. The LNG storage tank is a sandwich storage tank. Since the liquid natural gas temperature is lower than -162 degrees Celsius, the LNG storage tank is also a low-temperature storage tank. In order to meet the requirements of liquefied natural gas, LNG storage tanks should be jacketed to ensure the temperature inside the tank. Many people may have heard that LNG storage tanks are quenching and liquid shocking, but they don't really know what it is. Today LNG Transport Trailer Factory will give you a brief explanation.

Due to the intermittent nature of the refueling of LNG Cylinders For Vehicles, the equipment in the refueling station repeatedly starts and stops, and the opening or closing of the valve or pump causes the flow velocity of the liquid in the pipeline to suddenly change, sometimes it may be a drastic change, and the momentum of the liquid also occurs. Change, the pressure inside the pipeline rises or falls rapidly, and it is accompanied by the sound of liquid hammering. This phenomenon is called liquid hammer (or water hammer). The liquid impact will cause a drastic change in the pressure inside the pipeline, and the pressure will suddenly rise. In severe cases, the pipeline may burst, and the rapid pressure drop will cause the pipeline to be under pressure, which will cause the pipeline to be unstable and cause the pipeline to vibrate.

LNG Cylinders For Vehicles

LNG Cylinders For Vehicles

Quenching refers to the rapid cooling of pipes or equipment in a short period of time. Due to the intermittent operation of the LNG Cylinders For Vehicles refueling station, during the process of abruptly starting the refueling or unloading after the system is running, especially the running start may cause quenching. The quenching phenomenon will form a temperature gradient at the top and bottom of the pipeline, causing the pipeline between the two supports to flex. Due to the large flexural stress, the pipeline is at risk of breaking.

Cryogenic Cylinder Factory recommends that in order to prevent the occurrence of quenching and water hammer, the design should take into account the cold shrinkage of the pipe caused by the low-temperature characteristics of the medium in the pipe, and set a reasonable pipe compensation method; the gas station must be operated before running. Pre-cooling of equipment and pipelines; the speed of opening and closing of pumps and valves must not be too fast during operation. It is recommended to use valves with longer strokes, such as low-temperature shut-off valves, to prevent sudden rise and fall of pressure.