Page 419 - Cat4800-Oct2011

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