What is the purpose of a restriction orifice?

The restriction orifices are used for reducing fluid pressure and are designed somewhat different from the orifice plates that are used for measuring flow rates. They are designed to slip between the piping flanges.

Where are restriction orifices used?

(i) Restriction Orifice (RO) at the downstream of blowdown valves. These are used to ensure controlled flow rate in a blowdown piping or blowdown header.

What is a flow restriction orifice?

Restriction orifice or RO, in short, is a flow control instrument device whose primary function to provide a restriction to the flow so that a controlled or restricted flow is achieved. Due to this restriction by the orifice plate, a pressure head drop from the upstream of the orifice to the downstream is observed.

How does an orifice plate reduced pressure?

When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.

Why are orifice plates beveled?

The purpose of having a square edge on the hole in an orifice plate is to minimize contact with the fast-moving moving fluid stream going through the hole. Ideally, this edge will be knife-sharp. Beveled orifice plates are obviously uni-directional, and must be installed with the paddle text facing upstream.

Does a restriction orifice reduce flow?

Under the right conditions, both pressure and flow control can be achieved using a restriction in the plumbing line. A reduction in orifice size results in decreased flow as only so much liquid can pass through the orifice.

What is the difference between orifice and restriction orifice?

Difference between an Orifice Plate and a Restriction Orifice? An Orifice Plate is used to measure flow, while a Restriction Orifice is used to drop upstream pressure of a system. It is similar to an orifice plate but is thicker.

What is a restriction orifice plate?

Orifice plate or restriction orifice is a device used for measuring volumetric flow rate in a pipe. Orifice plate works based on Bernoulli’s principle. Bernoulli’s equation states that pressure drop across the restriction orifice is directly proportional to the volumetric flow rate passing through the orifice plate.

Where are orifice plates used?

The orifice plate flow meter is commonly used in clean liquid, gas, and steam services. It is available for all pipe sizes but it is very cost-effective for measuring flows in larger ones (over 6″ diameter). The orifice plate is also approved by many organizations for custody transfer of liquids and gases.

How does a restriction orifice reduce flow?

The restriction orifice causes an increase in pressure drop in the pipeline. The increased pressure drop reduces the pumping output.

Why orifice plate is tapered?

The hole is “tapered”, meaning that the edge of the orifice hole is sharp. The plate must be inserted in such a way as to have the direction of flow of gas from the smaller to larger diameter, i.e. if the gas is flowing from left to right, the sharp edge of the orifice (the smaller diameter) must be at the left.

What is the difference between flow orifice and restriction orifice?