![]() The pressure drop is minimal and fairly constant.It does not require external impulse or lead lines.Upstream length/ Downstream straight length is 10 / 5 Advantages of Rotameters.Accuracy: It varies from ☑% to ☒% of actual flow.MOC: Borosilicate glass/brass/steel/ stainless steel/ Hastelloy.Flow range: upto 920 cubic m/hr for liquids & 2210 cub.m/hr for gases.Fluids/ Applications: Clean liquids, gases, and vapors.Design Temperature: Upto 400 deg.C (GLASS TUBE) / 538 Deg.Design Pressure: Upto 350 PSIG (GLASS TUBE) / 720 PSIG (METAL TUBE).3: Variable area flowmeters Design Features of Rotameters Inside the tube, there is a free-moving metering float.įig. The size of the tube varies from top to bottom because of this, it got its name as a variable area flowmeter. It consists of a vertical glass or plastic tube. Variable area flowmeters or rotameters are one of the widely used common flowmeter types. Not suitable for viscous and slurry applications.Very low-pressure drop Disadvantages of Annubar flow meters.Hot tapping: Insertion/ installation without system shutdown.The integral manifold head allows direct mounting of DP transmitters.Upstream length/ Downstream straight length is 20 / 5 Advantages of Annubar flowmeters.The accuracy of the DP transmitter varies from ☐.1% to ☐. MOC: Brass/steel/ stainless steel/ Hastelloy.Fluids: Clean Liquids, gases, and steam.Design Pressure: Upto 97 bars (38 Deg.The differential pressure corresponds to the dynamic pressure in the pipeline & the flow can is calculated directly.In the minus chamber of the annubar, lying on the opposite side, only the static pressure has any effect.With the flow, the probe records both the static and the dynamic pressure via the probe openings.The probe is installed in the median line as a pressure sensor.The annubar flowmeter measures this differential pressure which is then converted to flow rate using a secondary device. As per Bernoulli’s theorem, this differential pressure is proportional to the square of the fluid velocity in the pipeline. The flow is measured by creating a differential pressure. ![]() The Annubar flowmeter is a device to measure the fluid flow (liquid, vapor, or gas) in a pipeline. Cryogenics or High Temperatures Disadvantages of Venturimeters.No process interruption for the exchange of the DP transmitter.Lower head losses than orifice plates reducing the capital expenditure on pumping eqpt.Upstream length/ Downstream straight length is 20 / 5 Advantages of Venturimeters.MOC: No limitation (cast iron/ carbon steel/ SS/Monel, Titanium, Teflon, Hastelloy, Naval Bronze/haste alloy).Flow range: limited only by pipe size and beta ratio.Limited applications: Dirty /corrosive/viscous Liquids & Dirty gases.Fluids/ Applications: Clean Liquids/ clean gases.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.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. ![]()
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