The ethanol blending process is a critical part of gasoline terminal operation and has a significant impact on product quality, meeting environmental regulations and profitability. Optimizing the process is very important, but does present some control challenges. For example, thermal expansion of gasoline and ethanol do not occur at the same rate, and the blended mixture has to be isolated from water due to ethanol’s miscibility in water. For these reasons, many terminals blend in real-time while loading directly into the tanker trucks, but, the required control strategy doesn’t allow much room for problems or inconsistencies. Getting the needed control begins with accurate, consistent and reliable valve actuation.
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