Flow measurement is an important aspect of many operations in the process industry and a good understanding of the metering process remains central to the efficient production of chemicals and the safe disposal of waste. For example, purchase of feedstock, reactor flow rates, cooling water abstraction and return all require metering. The reasons for flow measurement vary from quality control, revenue calculation to environmental regulation. The required accuracy of flow measurement varies with application from better than 1% for quality monitoring, up to 10% for environmental regulation.
The many and diverse metering applications within the industry call for a wide range of metering technologies. For instance, while differential pressure meters are still widely used and open-channel meters are commonplace in wastewater discharge, Coriolis mass and ultrasonic meters are gaining in popularity within the process industry. Process plant is presents a complex environment for flow measurement and many meters are installed in situations that are far from ideal including access difficulties.
Typical process industry applications include: flow pacing for chemical dosing; metering of additives; odorant injection eg propane gas; process gas flow control; process analyser sample flow; condenser/evaporator flow control; gas monitoring for accounting purposes; leak detection; measurement of incoming water usage; scrubber gas discharge monitoring.
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