1)Theoretically elbows and bends could be used for flow metering, if the length of the pipe used in the setup leading up to the orifice plate is extremely long. It works best with a fully devolved flow. However, an orifice plate on most instances would not be feasible, because of the losses involved in the system. An orifice plate has the largest amount of head losses while a venturi meter has the least. These losses involved would make it difficult to accurately monitor the flow. If the length of the pipe used is long, that leads to the orifice plate, elbows and bends could then in theory be used for flow metering. Although an orifice plate on most setups would not be practical due to all the losses within the system, but this setup does work quite well with a fully devolved flow. The orifice plate has the greatest amount of head losses white the venture meter is on the other side of the spectrum with least amount of head losses.
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