Flow measurement of high-pressure plunger pumps and related issues
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The conditions are as follows: A high-pressure plunger pump is used as the feed pump, with a pressure of 10 MPa and a flow rate of 13 m³/h. The medium in question is some type of water solution with a density of around 1.3. Since it is used as a feed pump, it is necessary to measure the flow rate accurately. Under these conditions, what is the best way to measure the flow rate? Should a flow meter be installed at the outlet of the pump, along with an auxiliary accumulator, or would it be better to install it at the inlet? I personally prefer installing it at the outlet, as this allows for the use of a multi-plunger pump to reduce some of the pulsations, and the longer pipeline length can also help to mitigate these pulsations. Additionally, using an accumulator should help to keep the flow rate pulses within a certain range. Are there any other good methods? I’d appreciate some advice
It is advisable to choose a metering method on the container in front of the pump for greater reliability.
Mainly, the pipeline before the pump is too short; are there large fluctuations in flow rate, and can the flow rate be displayed accurately and stably?
I’m asking whether the container before the pump can be used for measurement. Otherwise, the compressibility coefficient of the liquid is very low, and it is impossible for no waves to be generated.
No. The buffer time designed for the storage tank is 4 hours; based on this, fluctuations in the feed rate could be too large. Moreover, since the feeding is continuous, it is difficult to measure such fluctuations
It can be installed at the pump outlet; if there are fluctuations in flow, the cumulative flow value can be monitored.
That is, if pulses are present, it might cause the cumulative value to be inaccurate as well, since the instantaneous values at each measurement point are inaccurate
Direct selection: A high-pressure plunger-type metering pump can effectively solve this problem.
But shouldn’t the original specimen be tested accurately? How can it be ensured that the flow rate measured by this flow meter isn’t subject to fluctuations?
We opted for plunger-type metering pumps, such as the J1.6-12.5 series of plunger-type metering pumps. In addition, we used mass flow meters, taking the average value over a certain time period as the actual flow rate; practical production tests have shown that the accuracy is acceptable
So, are your flow meters generally installed in the inlet or outlet pipeline of the pump? I think taking an average value is a feasible approach. To what extent can you control the error values? Is it possible to keep them below 1‰?