Rubber hoses use & maintenance
During use a hose can be subjected to many effects which have not been forseeen.
Obviously it is recommended to use the hose in accordance with our indications concerning working pressure, temperature, bend radius.
In case of doubt, please contact our technical department.
Hoses should be handled with precaution, they should not be dragged over sharp or abrasive surfaces, tied in knots, trampled or flattened by vehicles.
It is preferable to consult our techical department for any use other than for which it has been designed.
Even so, a chemical compatibility chart according to the different types of elastomers comprising the hose inner tubes of our range can be found at the end of this catalogue.
Should the relative movement of the hose give way to a torsion, the end-fittings and/or connections should be modified in such a way as to give flexion rather than torsion.
Resistance to traction
It is advised to consult our technical department for any traction effects to which the hose may be subject, as we are in a position to carry out traction tests.
Once per year, hoses should undergo visual inspection after cleaning with soapy water or tensioactive-product based detergents.
The hose must be rejected should any of the following defects be revealed :
- traces of leaks
- ripped or torn outer cover
- slipping of end-fitting
- abrasion or slash revealing the reinforcement structure
Hoses used with steam
Should the use be intermittent, that is used alternatively with steam and water following periods of cooling for example, the innner tube is subjected to thermal shocks leading to the phenomena of “pop-corning”, characterised by localised swelling.
In effect, the steam conveyed through the tube passes through the tube wall (it is for this reason that our hoses have their outer covers micro-perforated to eliminate the build-up of gasses and avoid swellings).
When the steam circulation is interrupted or during the cooling phase, the steam condenses through the inner tube wall.
When the temperature increases, this water then vaporises again with an increase in pressure.
The alternating effects of these thermal shocks creating localised swellings, deteriorate the inner tube.
In all cases, the hose should be maintained in such a position as to prevent water from stagnating during halts.
Hoses intended for food products
Users must apply necessary rules concerning cleaning operations (usually with steam) and their frequency.
Hoses intended for abrasive products
Abrasive products remove only a small part of the inner tube material in straight sections.
Consequently, abrasive product handling hoses should be maintained as straight as possible. in situations where bends cannot be avoided, theses should have a radius as large as possible.
Small radii give way to localised wear. It is the same for sections reduced by an external force, where the abrasive product is accelerated.
It is also necessary to ensure good electrical conductivity in order to evacuate static electrical charges produced by the rubbing of particles against the inner tube, otherwise leading to a perforation of the tube wall.
Hoses for corrosive or aggressive products
It is obviously necessary to consult the chemical compatibility chart at the end of this catalogue, taking into account temperature and concentration.
In case of doubt, contact the technical department.
It is preferable to avoid stagnation of the product in the hose, particularly with regards to solutions or emulsions as decantation can lead to concentrations above the admissible limits.
Hoses for inflammable products
This particularly concerns liquid hydrocarbons, liquids or gases. road transport rules impose a monitoring sheet, which must be furnished by the manufacturer, with annual inspections and replacement after 6 years.