The process design process: how is the selection of flowmeters determined and finalized, and what responsibilities do the process team, the instrumentation team, and the manufacturers have respectively?

Process: Size, flow rate, temperature, pressure, fluid content. Instruments: Purchase, installation. Manufacturer: Calibration. ------------------------------------------------------------------ To determine the appropriate choice, it is necessary to consider the level of accuracy desired by the process owner; the higher the accuracy required, the greater the cost. Therefore, it is important to know up to what point the process owner is willing to invest in terms of cost

The process is responsible for providing the conditions, including the type of medium, operating temperature and pressure, design temperature and pressure, normal flow rate, maximum flow rate, and minimum flow rate. The instrumentation team is responsible for selecting the appropriate type of flow meter that meets the process requirements; it’s best to consult multiple manufacturers and communicate closely with their staff to gather information. Regarding flow meters, the manufacturers are mainly responsible for coordinating with the instrumentation specialists to assist with the selection process. Finally, the instrument is responsible for feeding back the selection details to the process, including dimensions and adjustments to the PID parameters.

Is the accuracy of that flow meter determined by the instrument itself or by the process?

In process control, the normal flow rate, maximum flow rate, and minimum flow rate are commonly used, and accuracy is essentially covered by these values. Precision is improved through the manufacturing process; when selecting instruments, it is necessary to know the precision level.

Commonly used instruments such as those for measuring flow, temperature, and pressure are intended solely for observation and display; the accuracy of such instruments is generally determined by the instrument control system based on economic considerations； For applications with special requirements, such as reaction requirements, trade measurement, use in arbitration, needs for performance evaluation, or situations where high levels of hazard exist and low doses can be fatal and thus require testing, the accuracy requirements for such instruments are determined by the process engineering team; correspondingly, the economic costs also increase ； Sometimes, the accuracy of instruments may involve different price ranges that differ by several orders of magnitude; in such cases, the instrument specialists need to communicate with the manufacturer to determine whether the minimum accuracy of the final product meets the process requirements