FLOW MEASUREMENT APPARATUS ORIFICEMETER
Orificemeter is a device used for measurement of the rate of flow of
fluid through a pipe. The basic principle on which Orificemeter works is that
by reducing the cross-sectional area of the flow passage, a pressure difference is
created and the measurement of the pressure difference enables the
determination of the discharge through the pipe.
An orificemeter is a cheaper arrangement for measurement of
discharge through pipes and its installation requires a smaller length as
compared with other flow measuring devices. The opening in the form of orifice
is provided at the center of the plate.
An orifice meter
consists of a flat circular plate with a circular hole called orifice with is
concentric with the pipe axis. The upstream face of the plate is be leveled at
an angle lying between 300 and 450. The plate is clamped
between the two pipe planges with be leveled surface facing downstream. Two
pressure tappings are provided one on the upstream side of plate and other on
the downstream side of the orifice plate. The pressure difference exists between
two sections which, can be measured by connecting a differential manometer to
the two pressure taps. The discharge coefficient can be calculated using
formula. 
h is the difference of head in terms of water.
SAMPLE DATA SHEET
RESULTS & DISCUSSIONS
Calculate the discharge, difference of manometer reading and Cd for different sets of readings for venturimeter & orifice meter.
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