Connecting water pumps in series can increase the head pressure; why then isn’t the total head equal to the sum of the head pressures of each pump in the series?
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This post was last edited by Gorō’s Eight Trigrams Staff on 2015-7-9 at 11:25. Connecting pumps in series can increase the head pressure; then why isn’t the total head equal to the sum of the heads of each pump in the series?
I recommend giving ‘Pumps and Pumping Stations’ a look
How can the daily questions be marked as correct? I think they’re obviously wrong. If two pumps that can lift water to a height of 10 meters are connected in series, they should be able to lift water to a height of 20 meters. I haven’t studied much, so please don’t lie to me
I think the same as you – it can’t be simply added together. But it’s not about learning *this*, so I’m posting to ask for advice
I feel the same way. I studied the question; Daily Question No. 1 deals with the head of the second pump, and it’s a simple case of addition – the inlet pressure of the second pump is equal to the head of the first pump. And the total head is: greater than 1 and less than 2, due to factors such as pressure loss and friction.
:Lol, I picked the wrong one, but the answer turned out to be correct! How did I get so confused?
1. Concept: Head – the height that liquid per unit weight can be lifted by a pump. 2. The head of a pump is related to the scaling on the pump, its rotational speed, flow rate, as well as the distance between the inlet and outlet, the level of vacuum at the inlet, the pressure at the outlet, and the velocities at the inlet and outlet. Once the pump is installed, its head is actually only related to the flow rate. 3. For pumps connected in series, their total head should be the sum of the heads of each individual pump. 4. Do not equate head with outlet pressure.
It should be 1+1=2, right? To lift water to a height of 200 meters, one can use a pump with a capacity of 100 meters to raise the water to 100 meters high, and then use another pipe with a 100-meter capacity to pump it to 200 meters high. It can also be pumped up directly using a 200-meter pump. I feel that the first option requires less pressure on the pipeline
Some people say it’s correct for centrifugal pumps, but that it’s not incorrect for diaphragm pumps. Aren’t diaphragm pumps also a type of water pump? Diaphragm pumps have the problem of asynchronous pulses