Calculate orifice beta ratio, or solve for orifice or pipe diameter from any two values, with unit options and NPS schedule pipe ID presets.

Use the actual pipe inside diameter and orifice bore diameter. This is a geometry check, not a flow-meter certification.

Nominal steel pipe ID preset

Presets are nominal steel dimensions. Verify actual bore and tolerances.

Related Calculators

Orifice Beta Ratio Formula

The following formula is used to calculate the orifice beta ratio for a given diameter of the orifice and inside diameter of the pipe.

ฮฒ = dโ‚’ / dโ‚š

Variables:

  • ฮฒ is the orifice beta ratio
  • d_o is the diameter of the orifice
  • d_p is the inside diameter of the pipe

To calculate the orifice beta ratio, divide the diameter of the orifice by the inside diameter of the pipe.

What is an Orifice Beta Ratio?

The orifice beta ratio is a dimensionless number that represents the ratio of the diameter of an orifice to the inside diameter of the pipe in which the orifice is installed. This ratio is crucial in fluid dynamics and flow measurement, as it affects the flow rate and pressure drop across the orifice. A higher beta ratio indicates a larger orifice relative to the pipe diameter, which typically results in a lower pressure drop and higher flow rate. Conversely, a lower beta ratio indicates a smaller orifice, leading to a higher pressure drop and lower flow rate. Understanding and calculating the orifice beta ratio is essential for designing efficient fluid systems and ensuring accurate flow measurements.

How to Calculate Orifice Beta Ratio?

The following steps outline how to calculate the Orifice Beta Ratio.

  1. First, measure the diameter of the orifice (d_o).
  2. Next, measure the inside diameter of the pipe (d_p).
  3. Finally, calculate the Orifice Beta Ratio using the formula ฮฒ = d_o / d_p.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Diameter of Orifice (d_o) = 0.5 m

Pipe inside diameter (d_p) = 1 m; therefore ฮฒ = 0.5