How to select the right hose for a peristaltic pump?

No hose lasts forever, but if some simple guidelines are followed, it is possible to extend the life of the hose. Peristaltic pumps are simple, efficient, reliable, accurate and suitable for a wide range of media.  A hose Pump or  peristaltic pump drives fluid alternately by passive hose decompression to create a seal and by hose relaxation to draw liquid in. To ensure the pumping objective of your pump, selecting applicable hoses is crucial.

The following factors should be seriously considered when selecting hoses.
Consider materials of the inner layer in the hose in terms of chemical property, application temperature, abrasion, and FDA requirements. These factors are essential for conveying specific fluids.

The hose should have an appropriate wall thickness (2-fold) to match the fixed gap width between the rollers and the hose track wall encased in a peristaltic pump head.

Otherwise, the hose decompression might not seal the conduit, which would lead to inefficient pumping or no pumping.

Choose Associate in Nursing applicable within diameter (ID) of a hose for your given flow rates.

The hose ID and the rotor speed, in most extent, determine the pump flow rates.

A rate vary is usually outlined by a particular peristaltic pump with a particular hose.

The outside diameter (OD) of a hose should also be appropriate for the head. If the hose is oversized, it may cause excessive stress on the pump head and the gearbox, resulting in shortened life of the hose, the gearbox, and/or the pump. On the other hand, an undersized hose will work well if the wall thickness matches the pump head.
The outside surface finish might also be considered. If incorrect, the higher friction

Factors that influence the life of the hoses

- Chemical resistance to pumped fluids.

- Inlet and outlet pressure.

- Excessive pressures considerably shorten the life of the hose.

- Another factor and the one that has the greatest influence on the life of the hose is the number of revolutions of the peristaltic head (rpm) and the amount of driving rollers.

- Temperature of the pumped fluid and correct placement of the hose inside the peristaltic head are important.

- Always test the material in real operating conditions. If it is not possible to carry out a practical test, laboratory tests that simulate the operating conditions should be used.

The flexible hoses in this image are formed of several layers. Each of them fulfills a specific function.

Examples of the materials applied in flexible hoses are:

- The outer layer has a stainless steel mesh coating.

- The layer in contact with the fluid can be PTFE.

Fluoro elastomer hoses for peristaltic pumps

With optimal chemical resistance, elastomeric fluoro hoses for peristaltic pumps resist almost all aggressive chemicals, including organic solvents such as methyl ethyl ketone (MEK), toluene and acetone.

Fluoro elastomer hoses offer certain benefits, thanks to the characteristics they have:

- Thanks to its resistance, the composite structure of the elastomeric fluoro hose for peristaltic pumps, provides superior elasticity compared to conventional extruded hoses without reinforcement. In addition, these hoses generate less environmental pollution and safety risks because they do not break unexpectedly.

- Because the elastomeric fluoro hose for peristaltic pumps does not contain plasticizers, acid receptors, or other elements present in other products on the market, it is considered one of the cleanest hoses.

- Hoses that are less than 10% dilated are generally recommended for acceptable operation in the peristaltic pump during chemical service.

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