How to choose the differential pressure value of orifice flowmeter
Author: Source: Date: 2021-06-03 14:26:19
How to choose the differential pressure value of the orifice flowmeter? Due to the uncertainty, front and rear straight pipe sections and other factors involved, when calculating the aperture of the orifice flowmeter and the v-cone flowmeter, several factors must be considered comprehensively, rather than randomly choosing a larger pressure difference. The manufacturer of the throttling device is very clear that for throttling devices such as throttling flowmeters, when calculating the aperture according to the field parameters, there is a problem of how to choose the maximum differential pressure value of the differential pressure transmitter. In our usual production situation, do not blindly recommend our users to choose a larger differential pressure value. To be truly responsible to customers and to enterprises.
1. When the differential pressure value is large, the value becomes smaller, and the recommended minimum Reynolds number is small. In this way, the actual Reynolds number may be much larger than the recommended Reynolds number, the flow coefficient is stable, and the measurement accuracy is improved.
2. When the differential pressure value is large, the minimum straight pipe segment required can be shorter. In view of this feature, in the orifice flowmeter, considering various economic factors, the opening value with the largest differential pressure should be selected. On the other hand, the v-cone flowmeter is better. As long as the field fluid is a Newtonian fluid, the original v-cone flowmeter Requirements for straight pipe sections are low, even short
3. For differential pressure transmitters, the larger differential pressure is more stable than the smaller differential pressure. The above introduction is basically the benefits when the pressure difference is large, but in most cases, after reaching a certain level, it will relatively bring certain disadvantages.
Those who are familiar with the processing technology of the orifice flowmeter and the v-cone flowmeter should know that when the pressure difference is selected too large, the direct result is that the orifice becomes smaller and the pressure loss becomes larger. The pressure loss of the orifice flowmeter is very large. In addition to this, the cost of the pressure loss for the entire process system is quite large; compared with the v-cone flowmeter, it is slightly moderate.