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Orifice Discharge Apparatus (SMT-FM-05)
Pressure losses in the flow from tanks are essentially the result of two processes: the jet
deflection upon entry into the opening and the wall friction in the opening. As a result of the
pressure losses the real discharge is smaller than the theoretical flow rate.
SMT-FM-05 determines these losses at different flow rates. Different diameters as well as
inlet and outlet contours of the openings can be studied. Additionally, the contraction
coefficient can be determined as a characteristic for different contours. The experimental
unit includes a transparent tank, a measuring device as well as a Pitot tube and twin tube
manometers. An interchangeable insert is installed in the tank’s water outlet to facilitate the
investigation of various openings. Five inserts with different diameters, inlet contours and
outlet contours are provided along with the unit. The issued water jet is measured using a
measuring device. A Pitot tube detects the total pressure of the flow. The pressure difference
(read on the manometer) is used to determine the velocity.