What is orifice plate is used for?

The orifice plate is a metal disk with a concentric hole in it, which is inserted into the pipe carrying the flowing fluid. Orifice plates are simple, cheap, and available in a wide range of sizes. In consequence, they account for almost 50% of the instruments used in industry for measuring volume flow rate.

How many types of orifice plates are there?

There are mainly three types of orifice plates available. Let�s take a close look at these three types. Concentric � These are most commonly used in pipes below six inches for measuring flow rate of gases, liquids, and steams.

Why are orifice plates beveled?

The downstream side of the orifice plate is bevelled if the plate is relatively thick (1/8” or 1” or more). This bevelling helps to minimize contact with the fluid stream.

What is orifice plate and venturi?

Orifice has a precisely measured hole in the middle and is inserted in the pipeline to reduce pipe diameter and thereby to offer obstruction. Orifice Plate. Venturimeter consists of a straight inlet section, a converging conical inlet section, a cylindrical throat and a diverging conical outlet section.

Does an orifice plate reduce pressure?

A series of heat-treated stainless steel orifice plates are used to reduce the pressure from the inlet to the outlet. Each orifice plate is designed to provide a small pressure drop, which spreads the wear throughout the components.

Which type of orifice plate is used for gas application?

Concentric Bore – The most common orifice plate is the square-edged, concentric bored design. It’s used on most processes including clean liquids, gases and steam flow.

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 material is an orifice plate made of?

Concentric Bore – The most common orifice plate is the square-edged, concentric bored design. It’s used on most processes including clean liquids, gases and steam flow. It is usually made of stainless steel. Other materials like nickel and Monel are used for a good corrosive resistant property.

What is an orifice plate?

Orifice plates are typically sandwiched between two flanges of a pipe joint, allowing for easy installation and removal: The point where the fluid flow profile constricts to a minimum cross-sectional area after flowing through the orifice is called the vena contracta, and it is the area of minimum fluid pressure.

What does a conical-entrance orifice plate look like?

The conical-entrance orifice plate looks like a beveled square-edge orifice plate installed backwards, with flow entering the conical side and exiting the square-edged side: Here, is it vitally important to pay attention to the paddle’s text label.

What is the difference between an orifice plate and a venturi?

Venturis also require much less straight pipe upstream. A venturi meter is more efficient, but usually more expensive and less accurate (unless calibrated in a laboratory) than an orifice plate. In general, equation (2) is applicable only for incompressible flows.

When is it necessary to bevel the orifice plate?

If the orifice plate is relatively thick (1/8 or an inch or more), it may be necessary to bevel the downstream side of the hole to further minimize contact with the fluid stream: