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Answer Posted / ripul gosh
Hi Varadharajan,
It can't be vice versa because vent hole is used for liquid flow in pipes. If any gas gets trap being lighter in density it will go towards upside of the orifice plate. For this reason vent hole is on the upper side.
Drain hole-which is located towards the lower side of the orifice plate used for gas flow in industrial pipes. It is obvious that any particle will higher in density than gas and will always try to be on the lower side of the pipe. So drain hole provision is made so that the trapped solid or liquid particle will easily go out of the orifice plate.
Both the holes are provided so that the trapped material can't cause any erroneous reading in the differential pressure measurement.
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