What does an orifice measure?

An orifice meter is a piece of equipment used to measure the flow rate of a gas or a fluid. It mainly consists of an orifice plate, an orifice plate housing, and a meter tube.

How do you calculate orifice flow rate?

To calculate the flow rate of fluid passing through an orifice:

  1. Multiply the gravitational constant g with the mean centerline H .
  2. Multiply the produce with 2 .
  3. Find the square root of the product.
  4. Multiply the resultant with the area of orifice A and coefficient of discharge Cd .

How do I choose an orifice size?

Divide the flow of the liquid by the velocity of the liquid to determine the area of the orifice in square feet. In the above example, you would divide 8 by 2. The total area of the orifice would be 4 square feet.

How do you size an orifice plate?

Beta Ratio As discussed in flow instrumentation principles the beta ratio ( = d/D) is the ratio of the orifice plate bore diameter (d) and the pipe internal diameter (D). During sizing, keep your beta ratio in the range 0.3 to 0.7. This is the range of beta ratio that gives the best performance from the orifice plate.

What is nozzle meter?

Nozzle meter is bolted between flanges of pipe carrying the fluid. The pressures on upstream and downstream (P1and P2) are noted by using a differential pressure sensor for the calculation of flow rate. Pressure variation along with the pipeline for flow nozzle.

What is Venturimeter and Orificemeter?

Venturi meter and orifice meter are used for measuring the volumetric flow rate of the fluid that based on the continuity equation and Bernoulli’s equation. … Whereas the orifice meter consists of a thin plate and a bore. The pressure loss in venturi meter is 10% while in the orifice meter the pressure loss is 50-60%.

What is Eseod?

E.S.E.O.D. Equivalent sharp edge orifice diameter.

What is the maximum DP for an orifice plate?

In principle, 10:1 to 14:1 flow rangeability and 100:1 to 200:1 DP turndown is the maximum limit while selecting a single Orifice plate as a Flow element.

What is orifice bore diameter?

The orifice plate has a typical bore diameter that ranges from 30% to 75% of the inside diameter of the pipe work in which it is installed. … A beta ratio of 0.4 signifies that the orifice bore diameter is 40% of the pipe inside diameter.

Does an orifice reduce flow?

Does an orifice reduce flow? A reduction in orifice size results in decreased flow as only so much liquid can pass through the orifice. Since the flow of liquid is limited by the orifice, it follows that the pressure on the exit side of the orifice is less than that on the inlet side.

Is standard for orifice plate?

The standard material of construction is 316 stainless steel. Orifice Plates are manufactured in strict accordance to AGA, ISA, ASME, API, and ISO standards. … This is the standard flow element FE type orifice plate. The orifice is beveled on the downstream edge, in ac cor dance to AGA report #3.

Where is orifice plate used?

Orifice plates are most commonly used to measure flow rates in pipes, when the fluid is single-phase (rather than being a mixture of gases and liquids, or of liquids and solids) and well-mixed, the flow is continuous rather than pulsating, the fluid occupies the entire pipe (precluding silt or trapped gas), the flow …

How do you install an orifice plate?

What is nozzle and types?

A Nozzle is used to enhance the kinetic energy of a fluid which is flowing at the expense of inertial and pressure energy. Nozzles are of two types: convergent and divergent. Convergent Nozzles are used to accelerate the subsonic fluids while the divergent Nozzles are used to slow the fluids if their flow is subsonic.

Why is nozzle used?

A nozzle is often a pipe or tube of varying cross sectional area, and it can be used to direct or modify the flow of a fluid (liquid or gas). Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them.

Which is better orifice or Venturi?

The Venturi meter can handle large range of flow rates of fluid than the Orifice meter but once the Venturi meter is installed the range of flow rates it can handle becomes fixed. … Thus, Orifice meters offer much more flexibility of operation.

What is rotameter used to measure?

A rotameter (variable area meter) is a flow meter that measures volumetric flow of liquids and gases. There is no difference between a rotameter and flow meter, and these terms are used interchangeably.

Which is more accurate Venturimeter and Orificemeter?

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 a Venturi meter better than orifice?

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. Orifice plates are smaller in size when compared to venturimeters.

What is the CV of 1/2 pipe?


ESEOD (Inches) Cv Pipe Size Ref (Inches I.D. Nom.)
.375 2.7 3/8
.500 4.8 1/2
.625 7.3 5/8
.750 10.8 3/4

What is CV in gas flow?

Valve Flow Coefficient (Cv) is a valve’s capacity for a liquid or gas to flow through it. It is technically defined as the volume of water at 60F (in US gallons) that will flow through a valve per minute with a pressure drop of 1 psi across the valve.

What is a sharp edged orifice?

A rectangular sharp-edged orifice used as a discharge measuring device is a well- defined opening in a thin (metal) plate or bulkhead, which is placed perpendicular to the bounding surfaces of the approach channel. The top and the bottom edges should be horizontal and the sides vertical.