The multi-stage pump has low outlet pressure and low flow rate
Thread Content
A multi-stage pump is used to transport the medium liquefied petroleum gas, with a temperature of 40°C, a density of 0.50 t/m3, a flow rate of 17.4–23 m3/h, and an operating pressure of 1.9 MPa. Today, it was found that the outlet pressure is only 1.4 MPa, the flow rate is 9.6 t/h, and the outlet pump is running at full capacity. Because in the past, the same multi-stage pump failed to deliver sufficient flow, and washing it with water proved effective. The effect was not noticeable after washing it today. Currently, the pump is operating with normal sound levels and normal temperature. The estimated runtime is several months. The pressure can be held at 2.8 MPa when starting the pump. Could everyone please help analyze the cause: is it an excessive gap in the mouth ring, an excessive gap in the balance drum, a narrowing of the impeller flow channel, or cavitation?
What is the inlet pressure, the pump’s designed flow rate, and what is the head?
Start with pre-machine filtering and the control valves; after that, proceed with disassembling the equipment to identify the specific problem and determine whether it is indeed related to the equipment.
Let’s bleed off some air to see if it’s cavitation