Is it a reasonable design to use 2 flow meters for one pipeline?

Installing two flow meters of different or identical types in the same pipeline indicates high requirements for flow control, and the two flow meters can serve as a reference for each other. The accuracy of flow meters used for control can be relatively lower than that of flow meters used for measurement. HS1007 should be a soft-switching valve, meaning it can be operated using a flow control circuit or a pressure control circuit.

1. I checked some previous posts by Haiyou, and there were similar questions. As for why two flow meters are used, I think this reasoning is quite valid: It doesn’t matter which type of flow meter is used to control the control valve. The mass flow meter has high measurement accuracy, making it suitable for use in measurement purposes. Additionally, considering that trade meters need to be regularly inspected, if they are used for control purposes and have to be taken apart for inspection, and the production process cannot be stopped, then the automatic control loop will no longer have any measurement values. In such a case, would one have to modify the configuration and use an orifice plate for control instead? ” 2. Regarding the straight-run diesel in the intermediate feed line, there is another pressure transmitter as well; what type of control does this fall under? Firstly, this control regulates the flow rate of the three pipelines via liquid level control. The flow rate of the first pipeline is always controlled by the liquid level, while the flow rates of the second and third pipelines are controlled through selector switches K1 and K2. The pressure and flow control valves for the second pipeline are also controlled by these selector switches; it is possible to use pressure control during startup and flow control under normal operating conditions. This requires referring to the manual provided in the process package for details.

This depends on the owner’s production management requirements; accurate measurement is not necessary, so a flow meter can be chosen.

Are there any regulatory requirements regarding the separate setup of cumulative metering and control for flow meters in inlet and outlet devices, or are there any mandatory requirements under quality management systems?

As far as I know, there isn’t any; the Measurement Law doesn’t stipulate it either.

One for control, one for measurement. Control is for process monitoring, while measurement is for incoming and outgoing materials. Measurement requires high precision; small-signal rejection should not be used, and mass flow meters are now commonly employed. The control accuracy is low; methods such as small-signal rejection can be used. The calibration cycles for the two are different. Those under control are Class B meters, while those for measurement are Class A meters.

Top floor 3. It is clearly a orifice plate for control, and a mass flow meter for measurement. Measurement instruments are not connected to the control system; since mandatory calibration is required, they may need to be disassembled. Moreover, there is little cut-off for low flow rates in measurement, which leads to frequent operation of the control valves, which is not desirable.

There’s nothing unreasonable about it; if you have the money, just build it.

Follow the instructions as specified; we installed 3 flow meters on our slurry pipeline in order to achieve precise control