EQOfluids aluminium compressed-air pipe dimensions
EQOfluids aluminium tube comes in two pressure classes, at the same outside diameter but with a different wall (and therefore bore):
- PN16 — working pressure 232 psi (16 bar): the standard class for plant compressed air.
- PN70 — working pressure 1015 psi (70 bar): the high-pressure class.
Bars are sold in 4 m (13 ft) and 6 m (20 ft) depending on diameter. The inside diameter (bore) — the one that sets air velocity and pressure drop — is not printed on the chart; compute it as ID = D − 2 × S. It is given below (Inside diameter column).
PN16 pipe — 232 psi (16 bar)
| Outside dia. (D) | Inside dia.* | Wall (S) | Weight | Lengths |
|---|---|---|---|---|
| 20 mm (0.79 in) | 18.0 mm (0.71 in) | 1.00 mm | 0.19 kg/m (0.13 lb/ft) | 4 m · 6 m |
| 25 mm (0.98 in) | 22.8 mm (0.90 in) | 1.10 mm | 0.24 kg/m (0.16 lb/ft) | 4 m · 6 m |
| 32 mm (1.26 in) | 29.6 mm (1.17 in) | 1.20 mm | 0.33 kg/m (0.22 lb/ft) | 4 m · 6 m |
| 40 mm (1.57 in) | 37.4 mm (1.47 in) | 1.30 mm | 0.43 kg/m (0.29 lb/ft) | 4 m · 6 m |
| 50 mm (1.97 in) | 47.0 mm (1.85 in) | 1.50 mm | 0.58 kg/m (0.39 lb/ft) | 4 m · 6 m |
| 63 mm (2.48 in) | 59.4 mm (2.34 in) | 1.80 mm | 1.02 kg/m (0.69 lb/ft) | 4 m · 6 m |
| 90 mm (3.54 in) | 85.2 mm (3.35 in) | 2.40 mm | 1.09 kg/m † | 6 m |
| 110 mm (4.33 in) | 104.0 mm (4.09 in) | 3.00 mm | 2.86 kg/m (1.92 lb/ft) | 6 m |
| 140 mm (5.51 in) | 132.4 mm (5.21 in) | 3.80 mm | 4.57 kg/m (3.07 lb/ft) | 6 m |
| 160 mm (6.30 in) | 151.4 mm (5.96 in) | 4.30 mm | 5.89 kg/m (3.96 lb/ft) | 6 m |
PN70 pipe — 1015 psi (70 bar)
| Outside dia. (D) | Inside dia.* | Wall (S) | Weight | Lengths |
|---|---|---|---|---|
| 20 mm (0.79 in) | 16.0 mm (0.63 in) | 2.00 mm | 0.31 kg/m (0.21 lb/ft) | 4 m · 6 m |
| 25 mm (0.98 in) | 20.0 mm (0.79 in) | 2.50 mm | 0.48 kg/m (0.32 lb/ft) | 4 m · 6 m |
| 32 mm (1.26 in) | 26.0 mm (1.02 in) | 3.00 mm | 0.74 kg/m (0.50 lb/ft) | 4 m |
| 40 mm (1.57 in) | 32.0 mm (1.26 in) | 4.00 mm | 1.23 kg/m (0.83 lb/ft) | 4 m |
| 50 mm (1.97 in) | 40.0 mm (1.57 in) | 5.00 mm | 1.91 kg/m (1.28 lb/ft) | 4 m |
| 63 mm (2.48 in) | 51.0 mm (2.01 in) | 6.00 mm | 2.90 kg/m (1.95 lb/ft) | 4 m |
* Computed inside diameter (D − 2 × S), not printed on the EQOfluids chart. This is the useful bore for air velocity and pressure drop. † Weight per the EQOfluids specification (Ø 90: 1.09 kg/m), reproduced as-is from their official dimension chart.
Why the bore matters
For a given flow (SCFM), the smaller the bore, the higher the air velocity and the larger the pressure drop (Bernoulli’s principle — CAGI, handbook ch. 4). That is why sizing is done on the inside diameter, and why, at equal outside diameter, a PN70 tube (thicker wall, smaller bore) creates more pressure drop than a PN16. For the full method, see Sizing compressed-air piping.
Ordering references
EQOfluids part numbers encode the model (pressure class) in the prefix, then the diameter and the bar length (suffix .104 = 4 m bar, .106 = 6 m bar). For the exact reference of a size, see the network accessories catalogue.
With the Onyx M3 tools
- Network estimator — picks the EQOfluids aluminium diameter from the real flow and builds the bill of materials (pipe, takeoffs, outlets, supports).
- Calculator — Pipe sizing — compares diameters by pressure drop and by velocity.
See also Cutting and assembling the pipe and Supports and fixing the pipework.
References
- EQOfluids — Pipe Dimension Chart (official tube dimension chart, PN16 and PN70 classes): https://www.eqofluids.com/pipe-dimension-chart/
- CAGI — Compressed Air & Gas Handbook (7th ed., 2021), Chapter 4 — velocity and pressure drop depend on the inside diameter (Bernoulli’s principle)