Steam flow meters are affected by pressure
Thread Content
I would like to ask the teachers: When we use a 1.0 MPa steam flow meter in the plant, the flow rate indicated by it is greatly affected by the pressure in the steam pipeline system. For example: when there is no adjustment to the steam consumption within the unit, and the pressure in the external steam pipeline network is 0.6 MPa, the flow meter indicates an inflow rate of 23 t/h to the unit; however, when the pressure in the external steam pipeline network is 0.9 MPa, the flow meter shows an inflow rate of less than 20 t/h. What is the reason/principle behind this?
As the external pressure increases, with all other conditions remaining unchanged, the resistance goes up, so flow can no longer occur – isn’t it logical that the flow rate decreases in such a situation? It’s not a problem with the flow meter; it’s a problem with the flow rate, right?~
What type of flow meter is it? Is pressure and temperature compensation required?
As the pressure increases, the pressure difference between the front and back decreases, so the flow rate drops, which is normal. One can wait until the pressure reaches 1.0 MPa and then observe the situation. It is normal for flow meters to be inaccurate when a system is first put into operation; once the operating conditions stabilize, most flow meters will meet the design requirements.
It is necessary to specify which flow meter it is, so as to help everyone with the analysis.
It would be best to have pressure compensation... I don’t think it’s right for the pressure to increase while the differential pressure decreases
Steam should have temperature and pressure compensation; otherwise, the error will be very large: lol
What the original poster is saying is that it makes sense for the flow rate at a pressure of 9 kilograms in the steam external network to be higher than that at 6 kilograms, right?
When power comes from the external network to the device, high pressure from the external network should result in greater driving force, rather than greater resistance, right?
The flow rate measured by the steam-point flow meter doesn’t change; when the pressure in the external pipeline system increases, the total flow rate into the device actually decreases. It shouldn’t differ by too much, right? Haha