PROCESS FOR CONTROLLING THE CONTINUOUS METERING OF MULTIPLE ADDITIVES INTO A PRODUCT FLOW IN SEQUENCE THROUGH A SINGLE FLOWMETER

摘要

A process for controlling the continuous metering of multiple additives into a product flow in sequence through a single flowmeter is disclosed and claimed. The process includes continuously measuring the rate of a product flow. In response to the detected product flow rate, a first additive is routed through the flowmeter via an additive flow path such that an appropriate amount of the first additive is continuously provided to the product flow at a user defined blend ratio. After the proper amount of first additive has been provided, the additive flow path is flushed with a portion of product. After flushing of the additive flow path, a second additive may be directed through the same flowmeter via the same additive flow path.