USA
Proof and minimum burst pressure
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Ratio of proof and minimum burst pressure to working pressure
| Number | Mode of operation | Ratio proofpressure:workingpressure | Ratio minimum burstpressure:working pressure |
| 1 | water hoses,max working pressure1 Mpa | 1.5 | 3.0 |
| 2 | hoses for other fluids,solid mattersdissolved in fluids or air and waterhoses with a working pressureabove 1 Mpa | 2.0 | 4.0 |
| 3 | hoses for compressed air and othergases | 2.0 | 4.0 |
| 4 | hoses for fluids-which underreduction of pressure,i.e.blow offinto atmosphere-change to gaseouscondition | 2.5 | 5.0 |
| 5 | steam hoses | 5.0 | 10.0 |
| 6 | high pressure hoses | 1.5 | 2.5 |
Bending radius
Measurement of the maximum admissible bending radius
| The bending radius of hoses may be influenced by: |
r=maximum admissible
bending radius ofhose in mm
|
|
hose
construction(number and kind of reinforcements) wall thickness kind of material(elastomer/plastomer) helix |
|
| As a rule-of-thumb the bending radii are: | |
|
hoses with helix:inner diameter *5 hoses without helix :inner diameter *10 |
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| In addition please-take into account that hoses without helixand under pressure(>1 bar) allow distinctively smaller radii. |
