Engineering tools / preliminary selection

Air velocity & pipe size.

Compare the actual flow velocity across the PIPINOX pipe range. Start with your flow basis, line conditions and chosen velocity target.

Enter your design conditions

The starting values are examples. Set the velocity target required by your project; this tool does not assign a system pressure rating.

Flow reference & local atmosphere

Use the reference conditions stated with your compressor flow data. Normal, standard and free-air values may use different reference conditions.

First listed size within your velocity target

Calculated line flow:
Absolute line pressure:
Velocity at this size:

Preliminary velocity check. Pipe length, fittings, pressure drop, transients and the complete joint rating still require engineering review.

Discuss this sizing →

Compare the pipe schedule

Dimensions follow the confirmed 8 October 2026 product list. DN is nominal; the calculation uses inside diameter = outside diameter − 2 × wall thickness.

SizeOD (mm)Wall (mm)ID (mm)Velocity (m/s)Comparison
View pipe ordering codes →
Calculation basis & limitations

Steady ideal-gas flow, with compressibility factor Z = 1. Absolute pressure and kelvin temperature are used. Qline = Qref × (Pref / Pline) × (Tline / Tref); velocity = Qline / pipe area.

This is a velocity comparison at the entered conditions. It does not calculate pressure loss, a branched network, moisture effects, compressor control, or pressure containment. A size meeting the velocity target is not a final design selection.

Method references: NASA: ideal-gas equation of state and NASA: mass-flow continuity.