Why does the water pump trip?
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This post was last edited by liaifeng on 2018-8-11 19:44. Why does the pump trip? Is it because of the high water inlet pressure? What maximum pressure can a typical pump casing withstand? Is the mechanical seal related to the water inlet pressure?
The trip was caused by a motor trip; it is possible to determine the reason for the motor’s trip. Large motors are usually equipped with motor protectors that have high sensitivity. There are many reasons for a motor to trip, and process-related issues are just one of them. It is recommended to consult the electrical department for further investigation
There are several main reasons for tripping: 1. Excessive load. Tripped due to excessive current. For example, if there is a foreign object inside the water pump or if there is a short circuit between two windings, this can also cause an excessive current flow that leads to tripping. 3 The bearings of the motor are damaged, and the increased rotational resistance causes a trip. 4 Phase loss: One phase of the contactor has poor contact. I. If it trips after running for a few seconds, pay attention to the motor’s operating current. Then compare it with the rated current specified in the manual; if it is greater than the rated current, there is a problem with the motor’s operating condition or with the motor itself. (The current drawn by the water pump during operation is approximately at the rated value; analysis of the causes and solutions.) II. If the operating current of the water pump is normal, there may be a problem with the controller. Set the controller protection current to the motor operating current.
The department using it says the motor power is not sufficient
Thank you! Can excessive inlet water pressure cause a trip?
An excessively high inlet water pressure generally does not cause a trip
Now the manufacturer claims that we didn’t mention that the high import water pressure caused the tripping. We don’t understand the principle of water pumps either, so we’re coming to the forum for urgent help!
What water pump? Let’s talk about the specific operating conditions
Thank you! The details are as follows: A water pump has been purchased, with the requirements being 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 account 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?
What the manufacturer is saying makes sense; the design pressure of the IH pump is 1.6 MPa, while the actual pressure at which it is currently operating is 1.8 MPa, which poses a risk of explosion.