There are many types of flowmeters, and there are electromagnetic flowmeters, vortex flowmeters, annubars, and perforated plates, which are required for straight pipe sections. The requirements for straight pipe sections are mostly the first 5 after 3, that is, the corresponding pipe diameters. 5 times and 3 times. Now most electromagnetic flowmeters use non-uniform electromagnetic fields to have low requirements on the axial symmetry of the fluid velocity distribution, so the electromagnetic flowmeter can be appropriately reduced, while the vortex flowmeter, annubars and orifice plates have relatively strict requirements on the fluid velocity distribution. Failure to meet straight pipe requirements may result in unmeasurable measurements.
When the vortex flowmeter project was constructed, it was not carried out according to the design requirements. As a result, the straight pipe segment requirements were not reached. When the water linkage test was performed, the measurement was not just an error problem. The data was completely inaccurate. After the straight pipe segment was changed, there was no problem. , I believe we should know the importance of straight pipe. If there are conditions, it is recommended that the straight section be longer. Ordinary orifice for the first 10D after 5D, there are also for the first 24D after 7D, preferably before the straight section 30 ~ 50D as well; turbine flowmeter for the first 15D after 5D; vortex flowmeter for the first 20D after 5D; There is no special requirement for quality. However, it is generally better to have straight sections and have the length as long as possible.
There is no actual empirical data for measurement accuracy and error impact. If the measurement parameters are used for process control, errors within the acceptable range of the process are all possible. If it is used for measurement, such as water, natural gas, oil, etc. Then it should reach its nominal accuracy. In addition, the meter and metering bureau used for metering will accept it. Those that do not meet the standard will not pass.
A good flow meter needs a good field environment to cooperate with it, so that the flow meter can play its due role in industrial production. If the measurement is not accurate due to some restrictions on the installation, the flow meter will lose its own Due meaning.
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