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Basic Hose Constructions (Continued)

Flexible Mandrel Safety & Technical Information

The flexible mandrel method combines the long-length
advantage of non-mandrel hose with the close inside
diameter tolerances and high pressure ratings of rigid
mandrel hose. This is achieved by building the hose on a
long length mandrel made of flexible plastic or rubber.
Typical Size Range: 1-1/2" ID and smaller
Typical Uses: High pressure, air, water, LPG
Advantages: Long lengths, close tolerances on I.D., higher
pressure ratings than non-mandrel produced hose
Disadvantages: Higher cost than non-mandrel hose; not
available in ID sizes as large as rigid mandrel hose

Wrapped Ply – Machine Built Wrapped Ply – Hand Built

The wrapped ply construction is the oldest method Wrapped ply hose may be hand built when the diameter is
of making hose, applying all hose components (tube, too large for the building machine or where special built-
reinforcement and cover) in spiral strips on a rigid in ends are desired. The plies are laid on by an operator
mandrel. After a tube is in place on the mandrel, layers or rather than an automated machine process, allowing
plies of bias cut fabric reinforcement are wrapped around hand-forming of built-in ends.
the tube. The cover is applied and the hose is wrapped Size Range: 1/2" through 60" ID
in nylon tape prior to curing. This process is capable of
producing a hose for suction service when a helix wire(s) Typical Uses: Oil suction and discharge, sand suction,
is incorporated. acid suction and discharge
Advantages: Special ends can be built into the hose;
Size Range: 1/2" through 30" ID
wide size range; special constructions available in small
Typical Uses: Air; suction and discharge service for quantities
chemicals, dry materials, oil and water, conduit
Disadvantages: Relatively expensive due to high labor
Advantages: Good inside diameter tolerances, many content
special constructions available without large minimum
production runs, special ends available, wide size range
Disadvantages: Higher cost compared to non-mandrel
and flex mandrel; pressure and length limitations

Parker Industrial Hose Customer Service 405
866 810 HOSE (4673) 800 242 HOSE (4673)
Strongsville, OH South Gate, CA
Eastern USA Western USA
www.safehose.com
e-mail: indhose@parker.com