Problems with balance pipes in multi-stage centrifugal pumps
Thread Content
1. From which part of the impeller on the high-pressure side does the balance pipe of a multi-stage centrifugal pump originate, and to which part on the low-pressure side does it lead? 2. What pressure does the gauge on the balance tube indicate? What should the pressure be? What problems do excessively high or low pressures indicate? I hope the experts here can provide an answer!
It depends on specific factors such as the number of stages to determine from which part under high pressure it is taken; for example, it may be taken from stage 2 or stage 3, and various options are possible
What should be the pressure reading on the pressure gauge on the balance pipe of a multi-stage high-pressure pump, and are there any regulations regarding this?
1. A balance tube connects the high-pressure side outside the impeller disk, near the hub, to the suction side of the centrifugal pump, thereby balancing the pressures on both sides of the impeller and eliminating axial forces. 2. This pressure is related to the inlet and outlet pressures; the higher the pressure, the greater the axial force on each stage of the impeller. Therefore, a pressure difference exists in the balance tube; this pressure difference reflects the axial force of the rotor after it is balanced by the balance disc, and such forces are balanced by the thrust bearings. You asked about the specific pressure value; you should check the documentation that comes with the pump at the time of purchase to see if it’s listed there.
What is your equipment’s method for balancing axial forces? Generally, balance discs and balance drums are used to counteract axial forces. The high-pressure medium exerts a reaction force on the balance drum in order to offset the axial forces generated by the multi-stage impellers. The medium acting on the balance drum passes through the gaps in it and then returns to the inlet of the equipment via the balance pipes ； Therefore, the pressure on the balance tube at this time should not be too high (close to the outlet pressure); if the pressure is too high, it indicates that the balance drum is severely worn and needs to be replaced ；
There is no pressure gauge on the balance pipe, which is related to the number of stages of the multi-stage pump
1. From which part of the impeller on the high-pressure side does the balance pipe of a multi-stage centrifugal pump originate, and to which part on the low-pressure side does it lead? 2. What pressure does the gauge on the balance tube indicate? What should the pressure be? What problems do excessively high or low pressures indicate? Regarding question one: The balance pipe of a multi-stage centrifugal pump connects the balance chamber to the inlet pipe ； Regarding point two: the pressure in the balance chamber, or the sum of the inlet pressure and the losses in the balance tube – if this value is too high, the balance disc fails; if it is too low, blockage occurs
The discussion was very detailed; I learned a lot