Engineering CalculationSteam Pipe Sizing Calculator - Velocity and Pipe Size
Size a steam line from the steam flow, pressure and a target velocity, or check the velocity in an existing pipe.
Open the calculator →Formula
d = √(4 × ṁ × vg / (π × V))
ṁ = steam flow (kg/s), vg = specific volume (m³/kg), V = velocity (m/s)
Worked example
2,000 kg/h saturated steam at 7 bar(g) (vg = 0.2404 m³/kg), velocity 25 m/s
Volume flow = 0.1336 m³/s; d = 82 mm → choose the next standard pipe size up
Where engineers use it
- Boiler house headers and process steam lines
- Checking lines when steam demand grows
- PRV station design
How to use
- Click Open the calculator. It runs free in your browser, on desktop or phone.
- Enter your values. Units and typical ranges are shown next to each input.
- Read the result and the step-by-step working, then print or add it to your Project BOQ.
Questions
Does it include pressure drop?
The suite works out velocity and size; pressure-drop tools are also included in the piping section.