Solving problems with mechanical pumps
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The unit is equipped with a centrifugal pump (installed for suction operation), with a flow rate of 25 m³/h and a head of 45 m. The inlet and outlet dimensions are 65/40, and a check valve is installed on the outlet pipe with a diameter of DN50. The current problems are as follows: the outlet pressure is 0.45 MPa, but the flow rate is only around 10 m³/h, which does not meet the requirements of the current operating conditions. Help: From which aspects should I start troubleshooting, and do I need to select a new option? The working medium contains a certain amount of caustic soda.
Export DN40, with a maximum flow rate of 11 only
Under suction operation, check the length of the inlet pipe, the sealing condition, as well as the depth of the tank and the liquid level.
Make a distinction: in the case of an initial test run, design issues need to be taken into account； If the problem occurs the day after, consider a clogged inlet filter or an issue with the flow rate at the back of the pump. For reference.
Operating condition: The two wastewater treatment centrifugal pumps share one outlet pipe (DN40), and it is possible for both pumps to operate simultaneously.
Oh, in that case, it’s necessary to use the outlet valve for adjustment based on the rated current of each pump.
If the outlet pressure is sufficient, it indicates that there is no major issue with the pump; the focus should be on checking whether the backpressure and resistance in the outlet pipeline are too high. The two pumps share one pipeline outlet, and when both pumps are running simultaneously, one of them may have a higher flow rate while the other has a lower one
This post was last edited by pump-fans on 2021-3-5 at 15:05. When the specific gravity is less than 1, a pressure of 0.45 MPa is not equivalent to 45 meters; after confirming the specific gravity of the medium, loosen the valve a bit. Literally, there’s nothing wrong with the pump.
The outlet pressure is normal; the issue is that the pump flow rate is insufficient. Ask the manufacturer! ! The probability of inflated parameters is high
There should be no problem with the pump; it was an error in the selection calculations. The diameter of your impeller is currently estimated to be a little over 190 mm. You can replace it with an uncut impeller, or increase the diameter of the outlet pipe by one size.
It’s a pump with a capacity of 40–200. The description mentions a suction device – does that mean there is air contained within the self-priming device?