The centrifugal pump does not have sufficient head
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Please help analyze the reasons for the rapid drop in the head of the centrifugal pump. 1. The water pump is a center-opening pump with an outlet diameter of 125 mm and a reduced diameter of 250 mm. The required pressure must be 0.7 MPa; the outlet valve should be adjusted to the appropriate position so that the outlet pressure reaches 0.65 MPa. After about 4 meters of piping in the pump room, the pressure gauge shows 0.3 MPa. 2. The centrifuge is supplied to the site over a 200-meter long underground pipeline; there is a elbow at the end that raises the pipeline by 4 meters, and the pressure at that end is 0.23 Mpa. Is the rapid drop in pressure caused by an excessive change in pipe diameter and insufficient pipe resistance? Please help analyze it, thank you.
It is determined by the characteristic curve of your device.
At the maximum outlet pressure, the flow rate is inversely at its minimum :)
The second issue isn’t a big problem, but there’s definitely an issue with the first one. For a 4-meter pipeline without any fittings in between, the pressure drop shouldn’t be that high; with proper piping design, the pressure drop for hot water pipes should not exceed 80 Pa per meter. In your case, the pressure drop comes out to 87,500 Pa per meter.
I have a question; I just wrote it separately.
This post was last edited by ztxfhl on 2018-8-6 at 22:31. 1. If the \"exit pressure gauge\" is located before the exit valve, then there is no problem. 2. If the \"exit pressure gauge\" is located after the exit valve, then there may be a problem with the gauge. It is best to specify the pump’s rated head, rated current, and actual current, so that further analysis can be carried out.
It is likely due to the oversized diameter of the outlet pipe. The outlet diameter is 125 mm, with a reduced diameter of 250 mm; the expansion of the diameter has a pressure-reducing effect. Try turning down the manual valve in front of the centrifuge to see the effect.