An inline valve for
a pipe that pours acid into water in a small open top tank has to be selected
and installed. The chemical process technician knows that the process of mixing
acid and water raises the temperature of the solution. The tech also knows that
even though, from a safety perspective, the acid is always added to the water
to minimize splashing, the acid should pour into the tank slowly when the valve
is initially opened. Finally, the technician also appreciates that different
valve types are for different applications and in this case there are three
possible value types that could be selected. After studying the expected
performance curves below for the three valve candidates, the technician picks a
valve, reviews the selection with the controls engineer, and then proceed to
install that valve.
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