š Key Concepts
ā¢ Trace the distillate flow path on the diagram from the flash chambers (FC1/FC2) through the heat exchangers and pumps to each salinity cell SC1, SC2, and SC3.
ā¢ Identify which single component, if it failed, could introduce salt water into the distillate stream upstream of all three salinity cells.
ā¢ Consider the difference between contamination of the water (same effect at multiple points) versus instrument failure (local effect at one point).
š Think About
ā¢ Which pieces of equipment are common to the flow going past SC1, SC2, and SC3, and which are unique to only one of them?
ā¢ If there is a high reading at three separate salinity cells located along the same line, is it more likely that all three instruments failed at once, or that the water entering that line is contaminated? Why?
ā¢ Look at where HX1, OR1, and FC1 connect relative to the salinity cells. Which of these, if it has a problem, would affect all three cells rather than just one?
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Before You Answer
ā¢ Verify on the diagram that SC1, SC2, and SC3 are all monitoring the same distillate stream at different points along its path.
ā¢ Check whether a problem with HX1 or OR1 would introduce salt into the distillate side, or only affect feed/brine conditions.
ā¢ Confirm which component could cause salty water to leave FC1 with the vapor, so that every downstream salinity cell on that line would show a high reading.