Compressed Air Pipe Sizing & Pressure Drop Calculator
Size industrial compressed air distribution headers, calculate line velocity against CAGI standards, and determine pressure drop in aluminum and steel lines.
Flow Rate & Operating Pressure
CAGI Design Criteria
- Main Distribution Headers: Velocity ≤ 20 to 30 ft/sec (1,200 - 1,800 FPM)
- Branch Drops to Points of Use: Velocity ≤ 40 ft/sec (2,400 FPM)
- Header Pressure Drop: Target ≤ 1.0 to 2.0 psi across total plant run
Velocity & Pressure Drop Results
Flow & Compression Properties
CAGI Header Compliance Rating
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
What is the maximum recommended air velocity in compressed air distribution pipes?
The Compressed Air and Gas Institute (CAGI) recommends velocities below 20 to 30 feet per second (1,200 to 1,800 FPM) for primary loop headers. Slower velocities prevent turbulence, allow moisture droplets to settle into drain traps rather than aerosolizing into equipment, and keep frictional pressure loss minimal.
Why does modular extruded aluminum pipe have lower pressure drop than steel?
Extruded aluminum pipe possesses an ultra-smooth internal bore with a Hazen-Williams coefficient of C=150 (compared to C=100 for aged steel). Aluminum does not rust or form interior scale, permanently preserving laminar flow boundaries and eliminating downstream filter-clogging rust debris.
What is the difference between SCFM and ACFM in compressed air systems?
SCFM (Standard Cubic Feet per Minute) defines air mass flow standardized to atmospheric conditions (14.7 psia, 68°F, 36% RH). ACFM (Actual Cubic Feet per Minute) is the actual compressed volumetric flow physically traveling through the pressurized pipe at line pressure and temperature.
How does pressure drop in piping increase compressor operating energy costs?
For every 2.0 psi increase in compressor discharge pressure required to overcome distribution friction, the air compressor consumes approximately 1.0% more electrical energy. Minimizing piping restriction delivers immediate, permanent electricity savings.