The diameter variation issue in vortex flowmeters
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The vortex flow meter is used to measure steam flow, with a pipe diameter of DN50. The vortex flow meter was ordered in DN80 size, so a diameter change is required. Will this have a significant impact on the measurement of steam flow after the diameter change?
The straight pipe section meets the requirements; let’s check whether the flow velocity can reach the minimum requirement – if it can, then there should be no problems. . . . I mean, it’s too late to set another 50 now, right? Use 80 as spare parts for other places
It doesn’t make much difference; it’s underutilizing such a great product, which is a waste. :lol
It is also necessary to check whether the upper and lower limits of the range are sufficient; after all, the range for DN80 is larger than that for DN50
It may not be detectable at low flow rates
It’s impossible to have no problems – the pipeline is DN50, but you want to use a flow meter with a DN80 diameter. Check the installation specifications for vortex flow meters; sufficient length must be left in the pipes before and after them, that is, the pipes need to be long enough. Additionally, the original design was based on DN50 parameters, and now that it’s changed to DN80 pipes, the pressure and flow rate will definitely be different. The parameters need to be redesigned, and the manufacturer of the vortex flow meter should be consulted to carry out new calculations.
That’s exactly what I mean – the straight pipe sections meet the requirements, and of course, for a DN80 flow meter, the lengths of the straight pipe sections before and after it should be calculated based on DN80； The pipe size has become DN80, which will result in a lower flow rate. It’s necessary to calculate what the minimum flow rate will be to determine whether measurement can still be carried out properly In the straight pipe section, the flow velocity meets the requirements; so what’s the problem with changing it to 80?
It doesn’t matter as long as the Reynolds number is within the range. Make sure there is enough straight pipe section
I would like to ask: if the straight pipe section distance of the flow meter is insufficient, will there be errors? Is this error value constant? For example, the actual flow rate should be 2, but because my straight pipe section does not meet the requirements, the flow meter shows 1 due to errors. However, this error value remains constant, so it can still be used as a reference in practical applications
It can’t be just a simple fixed bias, right? The length of the straight pipe section is insufficient, resulting in a distorted velocity distribution of the fluid within the pipeline; as a result, the actual flow coefficient of the instrument differs from the flow coefficient specified at the time of factory calibration. To recalibrate, one needs to use a short-circuit calibration method, which is too troublesome. . .
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