Enter the pressure and orifice diameter into the calculator to estimate the steam flow rate. This calculator provides a simplified estimation of steam flow in pounds per hour (lb/h).

Steam Flow (Napier) Calculator

Enter any two values to calculate the third.

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Steam Flow Formula

The following formula is used to estimate the steam flow rate. 

SF = 24.24 * P_{abs} * D^2

Variables:

  • SF is the steam flow (lb/h)
  • P is the pressure (psia)
  • D is the orifice diameter (in)

To estimate the steam flow rate, multiply the pressure by24.24, then multiply by the orifice diameter squared.

What is Steam Flow?

Steam flow refers to the rate at which steam passes through a given area, typically measured in pounds per hour (lb/h). It is an important parameter in the design and operation of boilers, steam turbines, and other equipment where steam is used as a working fluid. Accurate steam flow measurements are crucial for efficiency and safety in thermal power plants and industrial processes.

How to Calculate Steam Flow?

The following steps outline how to estimate the Steam Flow.

  1. First, determine the pressure (P) in PSI.
  2. Next, determine the temperature (T) in degrees Fahrenheit (°F).
  3. Next, determine the flow area (A) in square inches (in²).
  4. Next, gather the formula from above = SF = P * T * A.
  5. Finally, calculate the Steam Flow (SF) in pounds per hour (lb/h).
  6. After inserting the variables 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.

Pressure (P) = 100 PSI

Temperature (T) = 300°F

Flow Area (A) = 2 in²