Problems in measuring nitrogen flow rate using vortex flow meters
Thread Content
Dear teachers, a Yokogawa vortex flow meter is to be installed on-site, with an operating pressure of 0.7 Mpa. Does the measured flow rate refer to the flow rate at a pressure of 0.7 Mpa? If the pressure drops to 0.5 Mpa, does the measured flow rate refer to the flow rate at 0.5 Mpa?
The vortex flow meter is a special type of flow meter that can accurately measure nitrogen flow. The principle behind measuring nitrogen gas flow rate is based on the vortex street principle used in vortex flow meters. When gas flows through such a meter, certain vortices are generated; by measuring the intensity of these vortices, it is possible to determine the volume of gas flowing. -
If there are variations in the pressure under the measured operating conditions, the flow rate value you measure will be inaccurate; pressure compensation is required
This post was last edited by CHANGBAISHI on 2023-2-27 at 08:02. It’s best to carefully read the instructions; the values should be calculated under standard conditions, and they represent readings taken under those conditions. For example, the condition for the initial flow of the fluid should be that a pressure difference is generated before and after the flow meter; only this pressure difference can cause the fluid to flow. Otherwise, in the absence of a pressure difference, differences in pressure cannot cause fluid flow. For reference.
Vortex flow meters measure volumetric flow rate, specifically the volumetric flow rate at the current pressure. In most cases, temperature and pressure compensation is required to convert this value into the volumetric flow rate under standard conditions
Principle of vortex flow meters: the relationship between flow velocity and vortex frequency. What is measured is the volumetric flow rate; therefore, changes in pressure do not affect the volumetric flow rate, but only the mass flow rate.
The flow rate shown is the flow rate under standard conditions. In theory, the measurement results of vortex flow meters are independent of the composition of the medium, but they require a certain flow velocity (which is also the reason for the variation in diameter of vortex flow meters). If your vortex flow meter lacks temperature and pressure compensation, the measured results are likely to be inaccurate
The pressure has decreased, so for the same volume, the cubic meters will be less, right?