# Restriction Orifice Calculators

## Our best Restriction Orifice Calculators

In this category we will find useful tools for the instrumentation engineer, such as the measurement of the different variables that allow defining a restriction orifice. With these calculators we can determine the dimension of the orifice size, the pressure drop or the volumetric flow. We will gradually add more tools to this section. The results of all calculators are exportable in spreadsheet format. If you have any questions or require further clarification, do not hesitate to contact us.

#### Restriction Orifice Calculator - Find Flow Rate

This calculator let you calculate the flow rate based produced by a restriction orifice plate. The results are exportable in spreadsheet format.

#### Restriction Orifice Calculator - Find Orifice Size

This calculator let you calculate the restriction orifice size based on pressure drop and flow rate. The results are exportable in spreadsheet format.

#### Restriction Orifice Calculator - Find Pressure Drop

This calculator let you calculate the restriction orifice pressure drop starting from orifice size and flow rate. The results are exportable in spreadsheet format.

### Q1 - What is a restriction orifice and why is it used in industrial processes?

A restriction orifice is a device used in piping systems to control or limit the flow of a fluid, typically gases or liquids. It is designed to create a pressure drop across the orifice, which can be crucial for various purposes, such as reducing pressure, controlling flow rates, or measuring flow. Restriction orifices are commonly used in process industries to ensure safety, control, and measurement in fluid systems.

### Q2 - How do you determine the appropriate size for a restriction orifice?

Sizing a restriction orifice involves considering several factors, including the desired flow rate, the fluid properties (density, viscosity, and compressibility), and the upstream and downstream pressures. The most common method for sizing is based on the API 520 and ISO 5167 standards, which provide equations and tables to calculate the required orifice size based on these parameters. Additionally, the type of flow (e.g., compressible or incompressible) and the specific application (e.g., control or measurement) will influence the sizing process.

### Q3 - What are the different types of restriction orifices, and how do they differ in sizing?

There are various types of restriction orifices, including concentric, eccentric, and segmental orifices. The type of orifice selected depends on the application and the specific requirements. Sizing for each type can vary, with eccentric orifices used for controlling flow rates and reducing erosion, while segmental orifices are often chosen for differential pressure flow measurement. The sizing equations and guidelines for each type differ, so it's essential to select the appropriate type based on your application and follow the relevant sizing standards.

### Q4 - How does fluid temperature impact restriction orifice sizing?

Fluid temperature can significantly affect restriction orifice sizing, primarily because it impacts fluid density and viscosity. As temperature changes, the fluid properties can vary, which, in turn, affects the pressure drop across the orifice. It is crucial to consider the operating temperature when sizing a restriction orifice, as it can influence the selection of the orifice size, the type of orifice, and the material of construction to ensure the device functions effectively and safely. Moreover, when dealing with gases, changes in temperature can affect the compressibility factor, which must be considered when sizing restriction orifices for accurate flow control or measurement.