Does the application of a split-control system impose any requirements on the diameters of the inlet and outlet pipes?
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Does the application of a split-control system impose any requirements on the diameters of the inlet and outlet pipes? For example, when the amount of intake air is low, a DN20 pipe diameter is chosen, but if the instantaneous amount of exhaust air is high, a DN200 pipe diameter is used. With such a large difference between the inlet and outlet diameters, is it possible to achieve split-control? In previous applications, the inlet and outlet pipe diameters were always the same
The exhaust is related to the volume and temperature pressure, while the intake is related to the volume and temperature pressure of the incoming air
The conclusion is that the information available is insufficient; nitrogen at 20 bar and 10 MPa can also transport a large volume, while for 200-mm diameter pipes, the volume of liquid that can be transported is around 100 m3. Whether it’s possible to transport a certain amount depends on specific temperature and pressure conditions, as well as the flow rates of inlet and outlet gases – relying solely on the pipe diameter isn’t sufficient
How could a split-range control system have requirements regarding pipe diameter! The selection of pipe diameter is always related to the volume of exhaust gas; the amount of gas that passes through determines the size of the pipe. The core of split-range control lies in the selection parameters of the two control valves.
But with such a large difference in the amount of flow in and out, can it be adjusted just with a 4-20 output?
The nitrogen is sealed at a pressure of 0.001 MPa; the nitrogen pressure is very low
The air intake volume of the storage tank is primarily determined by the ambient temperature and the capacity of the discharge pump; if the flow rate of the discharge pump is low and the ambient temperature does not change much, then a smaller make-up air line will also be sufficient. The exhaust capacity of the storage tank is mainly determined by the size of the feed pump; sometimes the feed pump is quite large, which requires a large exhaust pipeline. For regulation, there’s no contradiction in that
Why is the nitrogen pressure so low? You’re referring to the nitrogen seal pressure; the pressure in the pipes shouldn’t be that low. How can gas enter the tank at such a low pressure? It’s necessary to do calculations – as mentioned before, one has to take the relevant parameters and calculate to determine whether it’s feasible or not. It’s not possible to tell just by looking at things superficially; even the control valves require calculation. I’m not sure what you mean by 4-20 – does it refer to 4-20mA? The output signal of control valves is generally 4-20mA, so there is no issue with inability to regulate it