Limited by DP transmitter/ pipe pressure ratings Limited by DP transmitter/ pipe pressure ratings. 2: Figure showing Venturi meter and Annubar Flowmeter Features of Venturimeters Further details of the venturi meter are provided hereįig. Pressure drop in the upstream cone is utilized to measure the rate of flow through the instrument. ![]() In the upstream cone of the Venturi meter, velocity is increased, and the pressure is decreased. 2) measures flow rates by constricting fluids and measuring a differential pressure drop. Subject to damage by water hammer and foreign objects.Accuracies decrease with Beta ratios above approximately 0.7.Measuring ranges from about 3:1 to 5:1.Impractical for systems with low static pressure.High permanent pressure loss & hence high energy consumption to overcome pressure loss.No process interruption for the exchange of the DP transmitter.Cost is relatively independent of pipe diameter since the cost of DPT is fixed.No limitations on the materials of construction, line size, and flow rate.Upstream length/ Downstream straight length is 20 / 5 Advantages of Orifice Plates.The accuracy of the DP transmitter varies from ☐.1% to ☐. MOC: No limitation (Steel/ Monel/nickel/ haste alloy).Fluids/ Applications: Cryogenic/clean gases & liquids/ Steam (saturated/superheated).Corner taps ( 16 inches) Features of Orifice Plates.Segmental & Eccentric orifice plate: Used for fluids containing suspended solids.Concentric orifice plate: Most commonly used.1: Differential head type flowmeters Types of Orifice plates (Fig.
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