Two pumps in series? ? ?
Thread Content
A high-pressure pump with a flow rate of 30 L/H, equipped with a high-pressure backpressure valve. . The outlet pressure is 15 MPa. . . A high-flow pump with a head of 20 meters and a flow rate of 2 cubic meters per hour should be connected in series a short distance away from the outlet of this pump. Will the flow rate of this high-flow pump be sufficient? Is it possible to use it in this way, given that high flow rate and high pressure are required? ! Is there a good way?
The pump ahead, 30L/h? Is the pump behind 2 m3/h? Are you trying to be funny?
Yes, that’s right. There’s nothing funny about it. The high-pressure pump first builds up the pressure, after which the high-flow pump is turned on; the two pumps are separated from each other so that the high-flow pump can handle the circulation process on its own
If the high-flow pump is used for circulation, isn’t it still 30 l/h? It’s the same as when nothing is added, right? Where does the talk of high traffic come from?
Your first pump determines that your flow rate will be at most 30 L/h
What the poster means is that the total flow rate of the pump ahead is 30 L/H, but 28 L/H is used for circulation, with only 2 L being pumped away by the pump behind it
Although I don’t know why the original poster has such a requirement, it certainly won’t achieve high flow rate and high head pressure.
It’s unknown what the pressure at the connection of the high-flow pump is; it’s very likely that fluid won’t be able to flow in due to the difference in head pressure (and thus it won’t function). The purpose of pumping in series is to increase head, while parallel pumping is used to increase flow rate.
No matter what type of pumps are connected in series, they can only increase pressure; it is not possible to achieve high pressure and high flow rate. To achieve high pressure and high flow rate, you should select an appropriate pump based on the desired pressure and flow rate, or use a series of pumps such that their combined flow rate meets or exceeds the required flow rate (which is equivalent to using a multi-stage centrifugal pump).
After one cycle with the high-flow pump, the total head is equal to the pressure of the high-pressure pump