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Dati sulla perdita di pressione

Determining the Pressure Loss of a Hose

When conveying materials pressure-loss is inevitable and must be considered by establishing the required compressor power. Our hoses are flow optimized, exceptionally smooth and the internal bending radius folds in a regular pattern, reducing losses to a minimum. Significantly lowering both the purchase and running costs of the system.

The total pressure-loss consists in the first part of Δpv, which can be found in the diagrams. A second part ΔpBogen must be considered and calculated if the hose is installed with bends.

(l = length of the hose, ζ = resistance value see below,
Δ = density e.g. of air is 1,21 kg/m³,
v = velocity of flow):

Determining the Pressure Loss of a Hose

The resistance value ζ must be calculated for every individual bend:

Calculation of the resistance value

Example

Pressure-loss of an I.D. 75 mm AIRDUC PUR® 351 FOOD hose with a velocity flow of 19 m/s (i.e. in the first diagram: Δpv=120 Pa/m). The total length of the system is 12 m with one 90° bend (i.e. φ=90° → k=1) with the minimum bending radius (i.e. Bending Radius + ½ x Ø/ID≈1 → ζ90°=0,51) and a second 180° bend (i.e. φ=180° → k=1,7) constructed with the doubled minimum bending radius (→ ζ90°=0,3):

Pressure-loss example calculation
Picture pressure-loss calculation

Average value of Δpv for the following hose types:

  • AIRDUC® 341, 350, 351, 352, 362, 363
  • AIRDUC® 356
  • BARDUC® 381, 382
  • NEO 2, SIL 2
  • TIMBERDUC® 533
  • NORPLAST® 379 - 380, 383 - 389
  • AIRDUC® 345, 355
  • AIRDUC® 357
  • NEO 1, SIL 1
  • PROTAPE® 326, 327
  • TIMBERDUC® 534
  • PROTAPE® 310, 322, 370, 371
  • PROTAPE® 301, 330, 332
  • TIMBERDUC® 531, 532
  • CP 450 - 487
  • SuperFlex 372
  • EVA 373

As the operating conditions of the user are outside our direct control and the constructive variety is too large, we can not guarantee the accuracy of the data.

 

Engineering modifications subject to change.