There are many types of flow meters. The meters that have requirements for straight pipe sections mainly include electromagnetic flow meters, vortex flow meters, annubars and orifices, etc. Most of the requirements for straight pipe sections are the first 5 and the third, which is the corresponding pipe diameter. 5 times and 3 times.At present, most electromagnetic flowmeters use non-uniform electromagnetic fields to have low requirements for the axial symmetry of fluid velocity distribution, so electromagnetic flowmeters can be appropriately reduced, while vortex flowmeters, annubars and orifices have strict requirements for fluid velocity distribution. Failure to meet the requirements of straight pipe sections may result in inability to measure. The construction of the vortex flowmeter project did not follow the design requirements. As a result, the requirements of the straight pipe section were not met. The measurement was not just a problem of error during the water linkage test. The data was completely inaccurate. Later, after the straight pipe section was changed, there was no problem. , I believe you should know the importance of straight pipe sections.If possible, it is recommended to keep the straight pipe section longer. Generally, the orifice plate is the front 10D and the 5D, and sometimes the front 24D and the 7D, the best straight pipe section is 30~50D; the turbine flowmeter is the front 15D and the 5D; the vortex flowmeter is the front 20D and the 5D; There are no special requirements for quality. However, in general, it is best to have straight pipe sections, and the length is as long as possible.We have no or no actual empirical data on the measurement accuracy and error effects. If the measurement parameters are used for process control, the errors within the acceptable range of the process are all possible. If they are used for measurement, such as water, natural gas, oil, etc. It should reach its nominal accuracy. In addition, the metering bureau used for measurement will check and accept it, and those that do not meet the standard will not pass. A good flow meter needs a good on-site environment to cooperate with it, so that the flow meter can play its due role in industrial production. If the measurement is inaccurate due to some restrictions on the installation, the flow meter will lose itself. The meaning it deserves.
Post time: 21-09-21