Which is better Venturimeter or orifice meter?

The pressure loss in venturi meter is 10% while in the orifice meter the pressure loss is 50-60%. The coefficient of discharge in the venturi meter is 0.98 while in orifice meter it is 0.6. The turn down ratio of venturi meter is 10:1 while in orifice meter it is 5:1.

Which is better Venturimeter or orifice meter?

Higher flow rates in high quality orifice plates gives increased accuracy. Venturimeters are widely used for high flow rates. They can handle 25-50% more flow rate than an orifice.

Which is more accurate orifice or Venturi?

For measuring mass flow rate of liquid flowing inside tube, venturimeter is the most accurate device. Since experimental measurement by venturimeter is 0.96-0.99 times theoretical measurement. Next comes, orifice meter which is 0.6- 0.62 times theoretical measurement.

Why is Venturimeter preferred over orifice meter?

In the venturi meter, there is a gradual contraction between the inlet and throat because of that the head loss is less in the case of the venturi meter. In the orifice meter there is a sudden contraction of the area between inlet and throat because of that there is more loss of head in the case of the orifice meter.

What are the advantages Venturi over orifice?

Venturi meter is used for operating in-compressible fluids. Venturi meter can handle large range of flow rates of fluid than that of orifice meter. Turn down ratio is 10 : 1. Co-efficient of discharge is relatively high 0.98.

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What are the advantages & disadvantages of Venturimeter?

How is orifice different from Venturimeter?

The main difference between venturimeter and orifice meter is the Venturimeter is not flexible with the flow rate range while the orifice plate in the orifice meter can easily change for different flow rates.

Which of the following is the most efficient flow meter?

The Coriolis flow meters are in general very accurate, better than +/-0,1% with an turndown rate more than 100:1. The Coriolis meter can also be used to measure the fluids density.

Which device is most efficient while measuring flow discharge rate?

Explanation: Orificemeter is the cheapest available device for measuring flow/discharge rate. 2.

Why is CD of orifice meter less than Venturi meter?

In Venturi meter losses are less so coefficient of discharge is higher whereas in orifice meter due to no convergent and divergent cones there are more losses and hence its coefficient of discharge is less.In venturi meter losses are low due to steamline shape of the diffuser and the pressure gradient is not abrupt as ...

What is the main disadvantage of orifice meter?

Disadvantages of orifice meter:

It requires the flow of axial velocity vectors. It causes a pressure drop in the fluid. Its accuracy is affected by the density, pressure and viscosity of the fluid. The range of measurement of viscosity limits of fluids.

Does a Venturi increase pressure?

A Venturi is a system for speeding the flow of the fluid, by constricting it in a cone shape tube. In the restriction the fluid must increase its velocity reducing its pressure and producing a partial vacuum. As the fluid leave the constriction, its pressure increase back to the ambient or pipe level.

Which of the three flow rate meter types is the most accurate?

Coriolis flowmeters are the most accurate, but even though they're pricey for big lines, they're often the first choice for lines less than 8 inches in diameter. Ultrasonic flowmeters also have high accuracy and turndown, so they're economical for large lines, and are used more often lately for such applications.

What is the most common type of flow meter?

The differential pressure flow meter is the most widely used flow technology in industrial process measurement and control, natural gas custody transfer measurement and many other applications.

How do I choose a good flow meter?

Ask the supplier about the failure rate of the flow meter in terms of the type of application you need it for. Calculate the longevity and the total life cost. Ensure that the instrument you are choosing has a long life. Understand where exactly and how the flow meter needs to be installed before choosing it.

Are Venturi meters accurate?

Note that by default, Venturi flow meters offer an accuracy of around ±1% of the discharge coefficient. Optimum calibration allows an even greater accuracy of up to ±0.25%. Venturi nozzle flow rate measurement systems are marginally more expensive than orifice-style flow meter systems.

Where is orifice meter used?

The orifice plate flow meter is a type of differential pressure flow meter that is commonly used in clean liquid, gas, and stream mass flow measurement.

Why venturi tube has low permanent pressure loss as compared to the orifice plate?

Compare Venturi and Orifice

The orifice meter has a large permanent loss of pressure because of the presence of eddies on the downstream side of the orifice-plate; the shape of the venturi meter prevents the formation of these eddies and greatly reduces the permanent loss. The orifice is cheap and easy to install.

What are the disadvantages of orifice plate?

Which type of flow meter is most applicable to measure a liquid flow in terms of direct weight measurement?

Differential pressure flow meters are, by far, the most common units in use today. These meters, which boast high accuracy, calculate fluid flow by reading pressure loss across a pipe restriction. Estimates are that over 50 percent of all liquid flow measurement applications use this type of unit.

Which flow meter is best suited for measuring flow rate of slurry?

Magnetic Flow Meters are volumetric flow meters. Mag meter is ideal for wastewater applications, or any dirty liquid which is conductive or water based. Accuracy over a wide flow range can be as good as ± 0.5% of flow rate or better.

Why Orifice plate is beveled?

A beveled orifice should form an angle of::

The orifice plate inserted in the line causes an increase in flow velocity and a corresponding decrease in pressure. The flow pattern shows an effective decrease in the cross section beyond the orifice plate, with a maximum velocity and minimum pressure at the vena contracta.

What is Venturi meter used for?

A Venturi meter is a gage to measure the volume flow rate of a fluid in a pipe. Venturi meters have been used for water and waste water volume flow rate measurements for centuries. These gages use a converging and diverging nozzle connected in-line to a pipe.

Why does Venturi reduce pressure?

The Venturi effect states that in a situation with constant mechanical energy, the velocity of a fluid passing through a constricted area will increase and its static pressure will decrease. The effect utilizes both the principle of continuity as well as the principle of conservation of mechanical energy.

Does a Venturi increase flow rate?

Venturi Meter or Venturi Tube

the higher the pressure difference (the lower p2), the higher the flow rate. the flow rate can be increased by decreasing the fluid density.