Water and Wastewater Terms Beginning O

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offset

(1) The difference between the actual value and the desired value (or set point); characteristic of proportional controllers that do not incorporate reset action. Also called drift. (2) A pipe fitting in the approximate form of a reverse curve or other combination of elbows or bends that brings a section of a line of pipe out of line with, but into a line parallel with, another section. (3) A pipe joint that has lost its bedding support, causing a pipe section to drop or slip, thus creating a condition where the pipes no longer line up properly.