Design Criteria for Rubber Pipes
a) Pressure conditions
We design our components individually for the pressure conditions in your system. We take the following parameters into account:
- Nominal pressure, abbreviated by „PN“ (Pressure Nominal)
It is the design pressure of the component and represents the maximum permissible operating pressure.
- Operating Pressure
It is the pressure at which the pipe or pipeline is actually operated. In many cases the operating pressure is below the nominal pressure and can be used for an improved component design.
If the pressure in the pipe falls below atmospheric pressure, we speak of a vacuum. The information is given in unit bar absolute or as a percentage, where 100% vacuum is equivalent with 0,00 bar absolute. Vacuum can also occur briefly in pressure lines when pumps are switched off or gate valves are closed.
b) Pumped medium
We select a suitable rubber compound for the inner wearing layer ("bore") and the cover of the component. The following criteria are decisive for the selection:
- Type of medium
- Temperature of the medium and
- Ambient conditions , especially high temperatures or contact with oil.
We also consider special requirements for the electrical conductivity (electrically conductive or insulating) when selecting the rubber quality. We often use rubber compounds with the following types of rubber:
|Type of rubber||Shortcut||General properties||Temperature||Used as|
|chloroprene rubber||CR||Very good UV, ozone and weather resistance, flame retardant||80°C||cover||ethylene propylene
diene monomer rubber
|EPDM||Very good ozone and weather resistance,
good resistance to steam and many chemicals.
Not oil resistant.
|inner bore, cover|
|nitrile butadiene rubber||NBR||Very good oil and fuel resistance.
Not ozone and weather resistant.
|NR - SBR||High elasticity, very abrasion-resistant,
conditionally oil-resistant, not weather-resistant
|inner bore, cover|