Issues regarding the use of small-sized vortex flowmeters in large-diameter pipes
Thread Content
The fluid flowing in the pipeline is cooling water, and the flow rate is not high; it ranges up to 900 kg/h, with an average of 600 kg/h. Based on the actual flow rate, an 8-inch vortex flow meter would be sufficient. However, the pipeline diameter is 16 inches, so if an 8-inch vortex flow meter is used, it will be necessary to use a reduction fitting to convert the flow meter’s outlet flange to a 16-inch size. I would like to ask experts: what impact will this reduction fitting have on the accuracy of the vortex flow meter?
A 16-inch pipe has a flow rate of less than 1000 KG/H, a Reynolds number of less than 1000, and a flow velocity of no more than 3 mm/S – it’s hard to imagine what kind of operating conditions this represents Did you make a mistake? The flow rate should be 600 T/H, right? Otherwise, I personally think you should choose a positive-displacement flow meter in order to make measurements.
It has been confirmed that the operating conditions are correct, which is why considering the use of a reduction fitting; in this case, reducing from 16 inches to 8 inches. It’s not clear whether the required precision can be maintained.
Vortex flowmeters with too large a direct diameter reduction, involving several different pipe diameters – there are no vortex flowmeters of that kind； It is more reasonable to have a diameter change outside the straight sections before and after the flow meter, and the length of these straight sections should be greater than what is specified by standards. The diameter-changing method cannot directly change the inlet and outlet flanges of the flow meter to 16 inches, otherwise measurement accuracy will definitely be affected.
Bro, 16 inches is equivalent to DN400, and the usual flow rate is only 600 Kg/h. Even if it’s reduced to 8 inches, DN200, will that ensure full pipe utilization? Please answer this question first
Either you’ve marked the flow rate incorrectly or you’ve chosen the wrong pipe diameter; even for DN200, the flow rate is 8 mm/s. What’s the point of this? That’s what you think? Even the small faucet at home can deliver more than 1 t/h of water flow – so what size are those pipes then?