High pump outlet pressure
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I have installed 2 steam condensate centrifugal pumps, with a head of 91 M and a power rating of 11.5 KW; the inlet pressure is 0.1 MPa. The outlet pressure of one of these pumps is 0.95 MPa, while that of the other is 1.1 MPa. Whenever they are started, the safety valves activate, preventing them from functioning properly. Please analyze what the reasons are
Reason: 1. The pressure in the condensate pipe line is too high, having exceeded the set pressure value of the safety valve； 2. If the pressure setting of the safety valve drops, it needs to be removed and recalibrated.
Let’s confirm whether the motor’s power exceeds the specified limit
The safety valve has already set the pressure at 1.0 MPa multiple times; as long as this pump starts operating, it triggers
Is there a filter element installed at the outlet? Is the filter element clogged?
It’s possible that the pressure gauge at the pump outlet is broken, so severe overpressure conditions go unnoticed
The set value of the safety valve is too low; for a pump with a head of 91 meters, the maximum operating pressure at the outlet can reach 1. 1MPA, set it to 1. 0 MPA; it will trip if the pipeline resistance is high. Check if there are any blockages in the outlet pipeline of this pump or if the valves are not open
1. There are several common reasons for a high outlet pressure reading: blockages in the outlet piping, valves, or filters, as well as inaccurate readings from the pressure gauge； 2. The safety valve activates: first, when the actual pressure exceeds the set pressure, resulting in normal activation; second, when the set value of the safety valve is too low or the elastic element fails, causing premature activation.
The closing pressure of the centrifugal pump’s outlet valve is much higher than the rated head; if the rated head is 91 meters, it’s normal for the pressure to exceed 1 MPa when the outlet pipeline is blocked or the valve is closed. It’s better to check the pipeline, or perhaps there’s an error in the system back pressure Were the requirements for the process not specified properly?
If there is sufficient flow, the impeller of the pump with a high head can be cut to reduce the head