Hose Products Division
Parker Hannifin Corporation
Wickliffe, Ohio
www.parkerhose.com
13
Crimping Machine
TH8-D206
Bulletin 4480-T22-US
Safety Guide for Selecting and Using Hose, Fittings and Related Accessories
tion is offered only as a guide. Actual service life can
only be determined by the end user by testing under
all extreme conditions and other analysis.
Hose that is chemically compatible with a particular
fluid must be assembled using Fittings and adapters
containing likewise compatible seals.
2.6
Permeation: Permeation (that is, seepage through
the Hose) will occur from inside the Hose to outside
when Hose is used with gases, liquid and gas fuels,
and refrigerants (including but not limited to such ma-
terials as helium, diesel fuel, gasoline, natural gas, or
LPG). This permeation may result in high concentra-
tions of vapors which are potentially flammable, ex-
plosive, or toxic, and in loss of fluid. Dangerous ex-
plosions, fires, and other hazards can result when us-
ing the wrong Hose for such applications. The sys-
tem designer must take into account the fact that this
permeation will take place and must not use Hose if
this permeation could be hazardous. The system de-
signer must take into account all legal, government,
insurance, or any other special regulations which gov-
ern the use of fuels and refrigerants. Never use a
Hose even though the fluid compatibility is accept-
able without considering the potential hazardous ef-
fects that can result from permeation through the Hose
Assembly.
Permeation of moisture from outside the Hose to in-
side the Hose will also occur in Hose assemblies, re-
gardless of internal pressure. If this moisture perme-
ation would have detrimental effects (particularly, but
not limited to refrigeration and air conditioning sys-
tems), incorporation of sufficient drying capacity in the
system or other appropriate system safeguards should
be selected and used.
2.7
Size: Transmission of power by means of pressur-
ized fluid varies with pressure and rate of flow. The
size of the components must be adequate to keep
pressure losses to a minimum and avoid damage due
to heat generation or excessive fluid velocity.
2.8
Routing: Attention must be given to optimum routing
to minimize inherent problems (kinking or flow restric-
tion due to Hose collapse, twisting of the Hose, prox-
imity to hot objects or heat sources).
2.9
Environment: Care must be taken to insure that the
Hose and Fittings are either compatible with or pro-
tected from the environment (that is, surrounding con-
ditions) to which they are exposed. Environmental
conditions including but not limited to ultraviolet radia-
tion, sunlight, heat, ozone, moisture, water, salt wa-
ter, chemicals, and air pollutants can cause degrada-
tion and premature failure.
2.10 Mechanical Loads: External forces can significantly
reduce Hose life or cause failure. Mechanical loads
which must be considered include excessive flexing,
twist, kinking, tensile or side loads, bend radius, and
vibration. Use of swivel type Fittings or adapters may
be required to insure no twist is put into the Hose.
Unusual applications may require special testing prior
to Hose selection.
2.11 Physical Damage: Care must be taken to protect
Hose from wear, snagging, kinking, bending smaller
that minimum bend radius, and cutting, any of which
can cause premature Hose failure. Any Hose that has
been kinked or bent to a radius smaller than the mini-
mum bend radius, and any Hose that has been cut or
is cracked or is otherwise damaged, should be re-
moved and discarded.
2.12 Proper End Fitting: See instructions 3.2 through 3.5.
These recommendations may be substantiated by
testing to industry standards such as SAE J517 for
hydraulic applications, or MIL-A-5070, AS1339, or
AS3517 for Hoses from Parker’s Stratoflex Products
Division for aerospace applications.
2.13 Length: When establishing a proper Hose length,
motion absorption, Hose length changes due to pres-
sure, and Hose and machine tolerances and move-
ment must be considered.
2.14 Specifications and Standards: When selecting
Hose and Fittings, government, industry, and Parker
specifications and recommendations must be re-
viewed and followed as applicable.
2.15 Hose Cleanliness: Hose components may vary in
cleanliness levels. Care must be taken to insure that
the Hose Assembly selected has an adequate level
of cleanliness for the application.
2.16 Fire Resistant Fluids: Some fire resistant fluids that
are to be conveyed by Hose require use of the same
type of Hose as used with petroleum base fluids.
Some such fluids require a special Hose, while a few
fluids will not work with any Hose at all. See instruc-
tions 2.5 and 1.5. The wrong Hose may fail after a
very short service. In addition, all liquids but pure
water may burn fiercely under certain conditions, and
even pure water leakage may be hazardous.
2.17 Radiant Heat: Hose can be heated to destruction
without contact by such nearby items as hot mani-
folds or molten metal. The same heat source may
then initiate a fire. This can occur despite the pres-
ence of cool air around the Hose.
2.18 Welding or Brazing: When using a torch or arc-
welder in close proximity to hydraulic lines, the hy-
draulic lines should be removed or shielded with ap-
propriate fire resistant materials. Flame or weld spat-
ter could burn through the Hose and possibly ignite
escaping fluid resulting in a catastrophic failure. Heat-
ing of plated parts, including Hose Fittings and adapt-
ers, above 450°F (232°C) such as during welding,
brazing, or soldering may emit deadly gases.
2.19 Atomic Radiation: Atomic radiation affects all mate-
rials used in Hose assemblies. Since the long-term
effects may be unknown, do not expose Hose assem-
blies to atomic radiation.
2.20 Aerospace Applications: The only Hose and Fit-
tings that may be used for in flight aerospace applica-
tions are tHose available from Parker’s Stratoflex Prod-
ucts Division. Do not use any other Hose or Fittings
for in flight applications. Do not use any Hose or Fit-
tings from Parker’s Stratoflex Products Division with
any other Hose or Fittings, unless expressly approved
in writing by the engineering manager or chief engi-
neer of Stratoflex Products Division and verified by
the user’s own testing and inspection to aerospace
industry standards.
2.21 Unlocking Couplings: Ball locking couplings or other
couplings with disconnect sleeves can unintention-
ally disconnect if they are dragged over obstructions
