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Perte de charge de l’air comprimé : guide et calculateur pour le nettoyage cryogénique & l’aérogommage
A "powerful" compressor isn't enough if pressure is lost in the pipes. Here, you understand pressure drop (ΔP), its causes and its effects on performance, then you calculate your actual pressure loss using a calculator designed for cryogenic and abrasive blasting applications.
The calculator gives you the pressure drop across your network. To avoid misdiagnosis, start by validating flow vs pressure (FAD), then compare your compressor against field benchmarks.
What is compressed air pressure drop?
Pressure drop corresponds to the pressure loss experienced by compressed air as it circulates through a network (pipes, hoses, fittings, filters, dryer, hose reel, etc.). It is measured in bar (ΔP) between compressor outlet and machine inlet (or nozzle).
In dry ice blasting as in abrasive blasting, this pressure loss directly impacts effectiveness, as it reduces the energy available to accelerate the dry ice or abrasive.
Why it's critical in cryogenics and abrasive blasting
If pressure drops before the machine, you often observe a "false" loss of effectiveness: longer job time, less clean results, and a tendency to compensate by increasing pressure or consumption. The air network then becomes the real bottleneck.
Compressed air pressure drop calculator (cryogenic & abrasive blasting)
Enter your compressor, pressure, length and line type. The calculator estimates pressure drop (ΔP), pressure at the nozzle, useful flow and automatic recommendations (diameter / hose assembly / rigid network).
↓ This calculator, its architecture, its operating logic, its calculation rules and its automatic recommendations are protected by copyright. Any reproduction, adaptation or reuse, in whole or in part, without prior written authorization is prohibited: Calculator protected by proof of priority filing (INPI – e-Soleau). © Cryoblaster® – Delta Diffusion / A. Romero
Pressure drop calculator — Compressed air
Choose a compressor (optional), then set pressure, length and line. In hose assemblymode, the restriction of nozzles is built in to stay consistent with field use.
Estimated pressure drop
0.661 bar
ΔP over the stated length (with hose assembly correction if enabled).
Pressure at the nozzle
6.339 bar(g)
Pe − ΔP (capped at 0).
Useful air at line end (FAD)
1.811 m³/min
1811 l/min equivalent free air.
Air velocity (indicative)
— m/s
Calculated from "actual" flow at Pe (approx. isothermal).
Recommendations (automatic)
- —
How to interpret the results
Low pressure drop indicates your network delivers stable useful pressure. If loss becomes moderate or critical, cleaning performance can drop, and you risk "compensating" by consuming more air (and more dry ice in cryogenics).
How to reduce compressed air pressure drop across your network
The best strategy is to secure useful pressure as close as possible to the machine, by limiting sources of friction and choking. In practice, the fastest gains come from of a dry ice projection nozzle plays a crucial role in its effectiveness. Indeed, a nozzle with a smaller diameter allows for a more concentrated and powerful dry ice jet, ideal for applications requiring increased precision., then from length and fittings.
FAQ — Compressed air pressure drop
Understanding the difference between set pressure and useful pressure
The pressure measured at your compressor outlet doesn't always reflect field reality. As soon as air circulates in the network, pressure drop (ΔP) appears.
- "Linear" losses: length + internal diameter.
- "Local" losses: bends, valves, filters, fittings and nozzles.
Result: : stable compressor pressure can translate to critical performance loss at the tool.
How to choose between diameter and length to limit pressure drop?
Le of a dry ice projection nozzle plays a crucial role in its effectiveness. Indeed, a nozzle with a smaller diameter allows for a more concentrated and powerful dry ice jet, ideal for applications requiring increased precision. is a priority. An undersized diameter will choke the network, even with a "big" compressor.
Length should stay reasonable, and each restrictive fitting or nozzle increases overall resistance.
At what ΔP level does this become problematic?
In practice, as soon as loss becomes "noticeable" at the tool, performance drops. The goal is to maintain stable useful pressure.
Tip: move the compressor closer to the work area, or connect at the nearest network point.
Can nozzles create significant restriction?
Yes: if the internal passage of the nozzles is smaller than the hose, they become the bottleneck. The "hose assembly" calculator integrates this behavior and also displays velocity in the nozzle.
↑ This calculator, its architecture, its operating logic, its calculation rules and its automatic recommendations are protected by copyright. Any reproduction, adaptation or reuse, in whole or in part, without prior written authorization is prohibited: Calculator protected by proof of priority filing (INPI – e-Soleau). © Cryoblaster® – Delta Diffusion / A. Romero