Is it necessary to install a gas-phase start-up tube at the pump outlet?
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As the title suggests, I notice that the unit mode of the pump places a strong emphasis on this aspect
Is the poster referring to the exhaust pipe at the pump outlet? It is generally necessary to install it in order to ensure the proper startup and operation of the pump.
It is necessary to add it to facilitate exhaust before starting the pump and during operation, thereby preventing air locking.
It is very necessary to add it; one reason is to prevent air locking when driving for the first time, and the other is to enable the pump to discharge fluid effectively when parking.
In principle, it’s necessary to have it in order to prevent gas entrapment. But I noticed that the centrifugal pumps in our factory don’t have this line at their outlets; there is only a drain line there.
When a centrifugal pump is started, if there is air inside the pump, the low density of air results in a weak centrifugal force generated upon rotation; as a result, the low pressure created in the center area of the impeller is not sufficient to draw liquid from the storage tank into the pump, and thus the pump cannot transport liquid even when it is started. This phenomenon is known as gas locking, indicating that the centrifugal pump does not have self-priming capability; therefore, the tank must be filled with liquid before starting. How to prevent air locking in centrifugal pumps? Answer: Fill the forward shell with liquid before starting. Ensure proper sealing of the casing; the valves and faucets used for filling with water must not leak, and their sealing quality should be good.
This start-up pipe is provided because the pump’s suction inlet is connected to a negative pressure system; it is installed in front of the check valve at the pump outlet and is connected to the atmospheric side of the suction vessel
I don’t understand what this connection means. If it’s to prevent negative pressure from pulling back, then isn’t there a check valve? There’s also a globe valve
Even if you use your toes to think about it, you should know that it’s a vapor equilibrium tube – it’s used to balance the pressure at the outlet of the pump and prevent backflow of liquid into the pump. Those answers about using gas for compression are nonsense. . . . How did you think about it? The gas prevention cover has a separate device; this is a pressure balance tube. I’ve explained it to you so clearly, yet you still won’t give me points
It’s tiring to play these things. Can’t you give me some points?