Why is there a large difference in the cumulative values of the water meters on the same pipeline?
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We use a water pipeline that is over 400 meters long; the pump’s output pressure is 7.5 kilograms per square centimeter. There is a difference of more than 20 meters in height between our facility and the pump. Our facility is at a higher elevation, and since the cumulative readings on the water meter at our facility and those on the pump’s outlet are quite high, we added another water meter along the pipeline, but still the readings don’t match. (The water pressure reaches around 2 kilograms per square centimeter when it arrives at our facility.) Currently, the reading on the water meter near the pump’s outlet is higher than that of the meter in the middle, which is in turn higher than the reading on the meter at the far end (in terms of cumulative value). We are using ordinary industrial water meters. Does anyone know the reason?
Leaking in the middle of the pipe? Leaks in multiple places?
Personally, I think that in theory they should be the same if there are no defects, but since these devices are used for measuring flow rate, they may also be affected by factors such as pressure, as well as whether the pipe is full of water or contains gas. It’s possible to investigate this further or consult the manufacturer of such devices.
Does such a long tube have no resistance at all?
What does it have to do with resistance? With mass conservation, as long as there is no leakage, shouldn’t the amount in be equal to the amount out?
As long as there is no leakage, it seems that the error is still caused by the difference between the gauges.
I misread it. Check to see if there are any missed spots
The pump provides energy to the liquid; part of this energy is used to raise the liquid level by 20 meters, to overcome the pressure difference between the two ends of the pipeline, and to account for various flow losses as the liquid moves through the pipes. The more valves and elbows there are, the greater the flow loss
I’m talking about water meters with large errors (all are new DN80 water meters), not the pumps.
1. First of all, it is assumed by default that the water meter is accurate and calibrated; otherwise, the readings are meaningless. 2. Have you checked for leaks or drips in the pipelines along the route? 3. Have you guys exchanged them? For example, swapping the water meters at both ends? 4. Consult the water meter manufacturer regarding the specific model and the factors that affect accuracy There are different types of water meters, such as flow-type and volume-type ones
1. The accuracy grade of industrial water meters is too low, which results in significant deviations when amounts are accumulated; what about the accuracy of the water meters at the pump outlet? 2. Is there gas in the water pipe? If so, it has a significant impact on the accuracy of the flow meter. The impact of liquid flow rate and pressure is minimal, and this aspect is generally not taken into consideration. 3. Whether there are any leakage points in the pipeline.