Steam flow rate
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As shown in the figure. When steam is being introduced, the flow is measured by the 7107A orifice flow meter; when steam is sent out, it is measured by the 7107B vortex flow meter. Check valves are installed at both the orifice flow meter side and the vortex flow meter side to ensure that steam enters through the orifice flow meter and exits through the vortex flow meter. However, during operation, when steam enters, the vortex street value essentially returns to zero, while the orifice plate continues to record values ； When steam is released, the vortex flow meter gives a reading that is pretty accurate, but the orifice plate also shows a value – which is strange. The orifice plate is equipped with a check valve; logically, the pressure difference before and after it should be 0. Even if the check valve isn’t sealed properly, the value should still be negative. However, when steam is delivered externally, the orifice plate keeps counting; when the root valve is closed, the differential pressure transmitter of the orifice plate also returns to zero. What should I dial? What are the reasons that cause this situation?
The orifice check valve is in the wrong position; it should be installed downstream of the orifice
Does this mean that the vortex flow meter has low pressure drop losses in its pipeline, and that a small amount of gas circulates internally when steam is emitted?
In my humble opinion, due to the air flow at the vortex street, the pressure on the left side of the orifice plate is lower than that on the right side (lower pressure occurs where the flow velocity is higher). This also indicates that the one-way valve is in good condition. The orifice plate is used for differential pressure measurement; therefore, it’s not surprising to see a flow rate indication when there is a differential pressure.
It would be best to include a PID diagram or a site diagram, as that would be more meaningful.
I just want to know how this is measured? What is the difference between the two, and what is the principle behind the measurement?
Are there valves on both sides of the orifice plate? If there is only one, then there will definitely be a display