Urgent help: Why does the water pump trip? Is it because the inlet water pressure is too high?
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I have now purchased a water pump with a requirement of a head of 60 meters and a flow rate of 12 m3/hr; the model chosen is IH50-32-250A, made of 304 material and equipped with a mechanical seal. Now it trips after just two minutes of operation. The inlet water pressure is 1.2 MPaG. When the outlet valve is fully open, the outlet pressure is 1.6 MPaG with a current of 18.5 A; when the outlet valve is closed, the pressure is 2.0 MPaG with a current of 16 A. It’s overloaded; the rated current is 14.7A. The pump manufacturer said that the overload is caused by too high an inlet water pressure, and we didn’t take this factor into consideration when placing the order. Moreover, the pump manufacturer stated that the pump casing is designed for a pressure of 1.6 MPa; with such high inlet pressure, there is a risk of the pump exploding, so they asked us to purchase a new one. Is that the reason?
Apart from the design pressure being higher than acceptable, it’s all nonsense – there are no issues with the manufacturer’s pump design
Thank you! So, a high inlet water pressure does not cause overload, right?
There are issues with the pump selection and design; the inlet pressure should have been provided to the manufacturer before selection, and it needs to be taken into account during the design process.
Ah, the inlet water pressure wasn’t communicated to the manufacturer; I thought that the product selection had nothing to do with this inlet pressure.
A member of the marine community said that high inlet pressure can lead to an increase in the axial force acting in the direction of the motor. The bearings used in the IH series are deep groove ball bearings, which cannot withstand large axial forces. Is that the reason? Also, does a high inlet pressure have an impact on the mechanical seal? On-site, there is one in use and one as a backup, and both have tripped
Centrifugal pumps have specific requirements regarding inlet pressure; a pressure of around ten to several dozen kilograms is not suitable for pumps designed for normal use. The manufacturer is correct
This post was last edited by sdwfsgyykai on 2018-5-12 at 15:31. The issue stems from incorrect operating conditions – insufficient compression; once the outlet valve is fully opened, the flow rate at the pump outlet becomes too high, causing overload and shutdown. This kind of situation often occurs during individual tests of the pump
The pump outlet pressure is the head plus the inlet pressure
Can excessive inlet water pressure affect tripping?