How to eliminate the liquid hammer phenomenon in pipes at the end of filling a liquid chlorine tank truck
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Dear colleagues: Our liquid chlorine tankers use a fixed-volume filling system; once the desired amount of liquid chlorine has been filled, the filling valve closes automatically (while the liquid chlorine transfer pump continues to operate). At the moment the filling valve closes, the pressure in the liquid chlorine pipeline rises sharply (the peak pressure is 0.5 MPa higher than the normal filling pressure). Although this pressure then drops back to normal levels within about 10 seconds, it still exerts considerable stress on the pipeline, posing serious safety risks! I would like to ask fellow netizens how to eliminate this phenomenon! Thank you! Note: The measure we are currently taking is to \"adjust the closing time of the filling valve\"; although there is some improvement, the effect is not significant!
The phenomenon of water hammer can be eliminated by altering the pipeline design; for example, a tee can be installed at the valve where the pipeline connects. Once the tank truck is full, it is sufficient to close the valve leading to the tank truck and open the return valve leading to the liquid chlorine tank. Finally, stopping the liquid chlorine filling pump will prevent water hammer from occurring.
We have never encountered such problems; what is the data upload volume of the original poster?
Isn’t this similar to the water hammer effect? Would it work to install a water hammer suppressor?
This is the pressure rise caused by the rapid closing of the on-off valve; it depends on the medium flow rate and pipe length, with the shock wave oscillating back and forth and gradually weakening
Loading can be done using a two-stage valve or a large and small valve; before finishing, close the large valve first and then the small valve. A regulated reflux method can also be used.
This allows for the calculation and analysis of the main influencing factors in order to determine the appropriate modification plan; it is not recommended to stop the pump first, as doing so too quickly can also cause water hammer