This calculator determines the pressure drop of a compressible gas or vapour through a pipeline. The calculator can model isothermal and adiabatic flow.
The calculator determines the frictional pressure drop through a line assuming either isothermal or adiabatic compressible flow.
The assumption of compressible flow is reasonable for gases and vapours where the calculated pressure drop is greater than 10% of the upstream pressure.
- Enter the line number, source and destination of the line
- Select the flow type - isothermal or adiabatic:
- Isothermal flow is usually assumed for long pipes
- Adiabatic flow is usually assumed for short, insulated pipes
- Commercial steel: 0.046 mm
- Drawn tubing (brass, lead, glass): 0.002 mm
- Asphalted cast iron: 0.122 mm
- Galvanized iron: 0.152 mm
- Cast iron: 0.259 mm
- 3" diameter and smaller: 1.5
- 4" and 6" diameter: 2.0
- 8" diameter and larger: 2.5
- Reduce the flow rate
- Increase the pipe diameter
- Increase the inlet pressure