Cannot pump enough volume
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We are now facing this issue: a pump with a rated flow rate of 8.6 m3/h, a power consumption of 3.7 KW, and a head of 50 m used to meet the operational requirements, but now its maximum flow rate is only 7.0 m3/h, which is affecting normal production. The medium in question is light benzene (after distillation), and the inlet pipe has a diameter of DN50. All four gate valves on the inlet pipeline are fully open. The pump has been checked and found to be in good condition; we’re not sure what could be causing this problem Everyone, please help analyze it. Thank you........:$
Cavitation or scaling inside the pump changes the density of the medium
In addition to what was mentioned above, it may also be necessary to check the gap around the mouth ring. An increased gap in the mouth ring leads to a reduction in the pump’s efficiency, which results in the problem you mentioned.
It was normal before but not now; I agree with the third floor’s opinion
There are several reasons for insufficient flow: 1. Wear of the pump itself, as well as wear of the sealing ring. 1. Wear of the impeller flow channels, etc. 2. Decreased motor speed. 3. Issues related to the medium. If the process permits, reducing the head slightly can increase the flow rate, thereby compensating for the insufficient flow
Pay attention to whether the viscosity of light benzene is affected by cold weather; if its viscosity increases, more pressure head is required in the pipes, and this will result in a decrease in flow rate
The pump was found to be in good condition after inspection, which indicates that it’s not a problem related to the equipment. Since it’s not an equipment-related issue, then it must be a process-related problem; therefore, it’s necessary to check for any changes in operating conditions compared to before
In addition to the reasons mentioned above, there is also the issue of whether export throttling is in effect, whether the pressure at the pump inlet has decreased, and whether the pressure in the system downstream of the pump has increased~~
It depends on what type of pump you are using and whether a professional has checked it. Sometimes even minor mechanical wear can affect its suction capacity, including the operation of the motor and the condition of the lubrication. If there are no significant changes in the process parameters, equipment problems are likely to be the cause. Additionally, as temperatures drop, the viscosity of the material changes. Its load will increase, which directly affects its flow rate. Factors such as equipment, processes, pipelines, instrumentation, and the environment all need to be taken into account; you will still need to investigate them step by step on your own.
It depends on the type of pump. With such a low flow rate, the pump won’t be large. To identify the problem, it’s necessary to look for causes in the equipment itself, but it’s also important to consider the process aspects as well. Let’s start by discussing the types of pumps
It is a basic model of shielded pump; it’s likely due to blockage in the inlet pipeline, as air entrapment occurs when pumping from the transfer tank.