Selection Aid for Filters And Connectors
Overview Flow Resistance In Hoses
Aid for the dimensioning of distribution hoses:
Example: A hose with an internal diameter D = 32 mm has the same internal flow rate as 32 hoses with an internal diameter of 6 mm or 4 hoses with an internal diameter of 16 mm.
Checklist For Selection Of Hoses
Criterion/Material | PVC | PU | PE | PA |
|---|---|---|---|---|
Resistance to oil | Good | Excellent | Good | Very good |
Resistance to fuels and natural gas | Medium | Very good | Medium | Good |
Resistance to weathering | Medium | Excellent | Medium | Medium |
Behaviour at low temperatures | Freezes at -20°C | Similar to a hard plastic at -35° bis | Freezes at -50°C | Freezes at -40°C |
Behaviour at high temperatures | Withstands 70°C for long periods | Withstands 80°C for long periods, for short periods up to 100° | Withstands 70°C for long periods | Withstands 85°C for long periods |
Dynamic stress resistance | Tensible strength: good; Ductile yield: very good, suitable for static installation | Tensible strength: excellent Ductile yield: excellent very high elasticity, excellent creepage resistance, thus suitable for trailing cable installations | Tensible stregth: very good; Ductile yield: vergy good, suitable for static installations | Tensible stregth: very good; Ductile yield: good, suitable for static installation |
Resistance to abrasion | Good | Excellent | Good | Good |
Checklist For Selection Of Filters
What is the minimum required nominal flow rate?
See the notes in the technical data.
Are there any size restrictions?
See the notes in the design data.
Is maintenance assured?
Planning and design should permit easy maintenance.
Checklist For Selection Of Connecting Elements
Which diameter is needed?
See the design diagramm "Overview Flow Resistance in Hoses"
How long are the hoses?
The hoses recommendations are based on a hose length of 2m. For longer hoses, larger diameters must be used.
Which hose material is needed?
See the material notes. In trailing cable installations, we recommend the use of polyurethane hoses.
What are the best hose connections for the application?
For dynamic applications, you should always use unions which are secured with union nuts or hose clamps.