How to reduce equipment vibration caused by water hammer
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The hot water in the hot water tank is directly heated by three kilograms of low-pressure steam. When the water temperature is set low (below 95 degrees), the tank and the floor vibrate greatly (the amplitude is unstable, with a large amplitude of more than 200 microns). This phenomenon is tentatively caused by water hammer, but how to eliminate the huge vibration caused by water hammer is a problem. I heard that there is a nozzle that can be eliminated, but I can’t find the relevant information. Please give me some advice! Thanks!
Is it a venturi tube? Our company uses it, that’s what everyone calls it.
water hammer: It refers to the impact force generated when a hot fluid such as steam partially condenses during the flow or when it is stationary and cannot be discharged in time. When the gas phase bubbles burst, the liquid phase quickly fills the vacancy. Method 1: Open the drain in time to drain the condensate. (Every time you turn on the steam water, drain it.) The water shock is scary. When operating the second method, do not turn on the steam from time to time.
The contact method of packed tower can be used instead. But I use the same process as you and it doesn't shock. I don't know what the difference is. I don't understand...
In steam pipes, if the heating pipe is insufficient and the water is not completely drained, part of the steam sent out will condense into water, and the volume will suddenly shrink, resulting in a partial vacuum. The surrounding medium will impact here at high speed, causing huge sounds and vibrations, which is called water hammer. The following methods are for your reference to eliminate water hammer: (1) Open or close the valve slowly ； (2) Minimize the length of the pipeline between the valve and the container ； (3) The pipeline is equipped with a safety valve, air valve or accumulator ； (4) Before supplying steam to the steam pipe, the pipe should be fully warmed and drained thoroughly, and then the valve should be slowly opened to supply steam.
It is recommended that LZ adopt a "steam-water mixer". The hot water heating system of our company's northern factory in winter is directly heated by steam. A steam-water mixer was selected during the design, and no "water hammer" phenomenon occurred.
At present, there is a hot water tank in our project that is heated by steam, and steam-water mixers are also installed at the four steam inlets. However, there was great vibration during the test run. The steam inlet valve opened very little, and the steam-water mixer still had water hammer. Because the tank vibrated too much, the welding seam of the stainless steel plate lining at the steam inlet nozzle was torn. However, the hot water tank is only activated when driving, so the problem remains unresolved. Please give me some advice from the experts.
Reply to the one above: If water hammer occurs in the soda-water mixer, there may be a problem with the mixer parameter selection. You can consult the manufacturer of the soda-water mixer!
When steam mixes and heats other liquids such as water in direct pipelines, the steam pressure and flow rate suddenly change, causing alternating changes in pressure that rise and fall sharply. This phenomenon is called water hammer or water hammer, and some people call it steam hammer. The generation of steam hammer will not only cause liquid splashing and even injury to people, but also produce huge impact on pipelines and ancillary equipment, causing flanges, welds, etc. to loosen, and in severe cases, it may cause safety production accidents. Just think about it, in a modern factory building, the heating process is pinging and thundering, which is definitely a quite disharmonious phenomenon. Today, the steam heaters designed and processed by Xin Dali Equipment are not only noise-free and vibration-free, but also low-cost and easy to install.
If the aerated water mixer does not work, the structure of the soda-water mixer should be inappropriate.