Composite Hose can provide the vital flexible connection to compensate for
vibration, movement or misalignment in a fluid transfer system.
Composite hose has a spiral internal metal supporting wire which
can be galvanized steel, stainless steel, aluminum or polypropylene
coated steel with a spiral external wire which is generally
galvanized or stainless steel. In between the wires there are
layers of thermoplastic fabrics and film.
The functions of the various components are basically as follows:
Internal wire spiral supports the hose wall and provides resistance to vacuum for
suction applications.
External wire spiral armors the hose against abrasion and impact damage and binds the
layers of fabrics and films tightly together.
Fabric layers act as strength members against internal pressure. It is also a
common feature of many composite hoses to have as the external
layer PVC coated fabric. This provides an easily cleanable color
coded surface and gives additional abrasion resistance.
Film layers act as a sealing medium to ensure that no product escapes from the
hose. Films and fabrics can be polypropylene, polyamide, PTFE,
polyester polyaramid or glass. By combining these alternative
components in various ways it is possible to produce hoses with a
wide range of chemical resistance, working temperatures and
pressures.
End fittings as with all types of hose, composite hose assembly depends on the
strength and reliability of its coupling system. Accord has
developed its own unique fitting configuration and swaging system,
which uses high quality rubber seals; steel or stainless steel
ferrules and couplings to ensure that when prototype tests are
conducted, the hose will burst before the end fitting is expelled.
This ensures the maximum strength of the hose is fully achieved.
Our swaging system gives superior results to wire whipping or
clamping methods of attachment, and guarantees electrical
continuity to ensure static electricity is fully discharged.
The inner wire is permanently in contact with the coupling. The
outer wire is normally in electrical contact but should either of
the wires be broken Accord uses electrically conductive seals to
guarantee continuity. In order to provide the widest range of
chemical resistance Accord swage seals are available in nitrile,
butyl or Viton® elastomers.
All the composite hoses in our catalog are available as complete
assemblies with a wide variety of end fittings such as flanges,
quick couplers, NPT nipples and dry break couplings. Common end
fitting materials are carbon steel, stainless steel, bronze,
aluminum and polypropylene, although many other materials are also
available.
Unless otherwise specified all Accord composite hose assemblies are
swaged with carbon steel ferrules and nitrile rubber seals.
Stainless steel ferrules and Viton or butyl seals are supplied on
request.
Temperature versus Pressure. Working pressures are calculated on a minimum safety factor of 5:1
burst pressure to working pressure as specified in USCG 154.500 for
heavy duty 4” ID and larger hose assemblies. Composite hose is manufactured from thermoplastics and accordingly
its working pressure will be reduced at elevated temperatures. Consult Accord personnel for advice on use at high temperatures.
