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Parker Hannifin Corporation
| Parflex
®
Division, TexLoc | Fort Worth, Tx |
For detailed ordering information, please consult price list or contact Parker Texloc.
F08
2.2
Pressure: Hose selection must be made so that the published maximum
working pressure of the Hose and Fittings are equal to or greater than the
maximum system pressure. The maximum working pressure of a Hose
Assembly is the lower of the respective published maximum working pres-
sures of the Hose and the Fittings used. Surge pressures or peak transient
pressures in the system must be below the published maximum working
pressure for the Hose. Surge pressures and peak pressures can usually
only be determined by sensitive electrical instrumentation that measures
and indicates pressures at millisecond intervals. Mechanical pressure
gauges indicate only average pressures and cannot be used to determine
surge pressures or peak transient pressures. Published burst pressure
ratings for Hose is for manufacturing test purposes only and is no indica-
tion that the Product can be used in applications at the burst pressure or
otherwise above the published maximum recommended working pressure.
2.3
Suction: Hoses used for suction applications must be selected
to insure that the Hose will withstand the vacuum and pressure of the
system. Improperly selected Hose may collapse in suction application.
2.4
Temperature: Be certain that fluid and ambient temperatures, both
steady and transient, do not exceed the limitations of the Hose. Tempera-
tures below and above the recommended limit can degrade Hose to a point
where a failure may occur and release fluid. Properly insulate and protect
the Hose Assembly when routing near hot objects (e.g. manifolds). Do not
use any Hose in any application where failure of the Hose could result in
the conveyed fluids (or vapors or mist from the conveyed fluids) contact-
ing any open flame, molten metal, or other potential fire ignition source
that could cause burning or explosion of the conveyed fluids or vapors.
2.5
Fluid Compatibility: Hose Assembly selection must assure com-
patibility of the Hose tube, cover, reinforcement, and Fittings with the
fluid media used. See the fluid compatibility chart in the Parker pub-
lication for the product being considered or used. This information 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 as-
sembled 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 materials as helium,
diesel fuel, gasoline, natural gas, or LPG). This permeation may result in
high concentrations of vapors which are potentially flammable, explosive, or
toxic, and in loss of fluid. Dangerous explosions, fires, and other hazards
can result when using the wrong Hose for such applications. The system
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
designer must take into account all legal, government, insurance, or any
other special regulations which govern the use of fuels and refrigerants.
Never use a Hose even though the fluid compatibility is acceptable without
considering the potential hazardous effects that can result from permeation
through the Hose Assembly.
Permeation of moisture fromoutside the Hose to inside the Hose will also occur
in Hose assemblies, regardless of internal pressure. If this moisture perme-
ation would have detrimental effects (particularly, but not limited to refrigeration
and air conditioning systems), 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 pressurized flu-
id varies with pressure and rate of flow. The size of the compo-
nents 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 restriction due to Hose collapse, twisting
of the Hose, proximity to hot objects or heat sources). For additional rout-
ing recommendations see SAE J1273 and ISO 17165-2. Hose Assemblies
have a finite life and if possible, should be installed in a manner that allows
for ease of inspection and future replacement. Rubber Hose because of
its relative short life, should not be used in residential and commercial
buildings for HVAC (heating, ventilating and air conditioning) applications.
2.9
Environment: Care must be taken to insure that the Hose and Fittings are
either compatible with or protected from the environment (that is, surrounding
conditions) to which they are exposed. Environmental conditions including but
not limited to ultraviolet radiation, sunlight, heat, ozone, moisture, water, salt wa-
ter, chemicals and air pollutants can cause degradation 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 applicationsmay require special testing prior to Hose selection.
2.11
Physical Damage: Care must be taken to protect Hose fromwear, snag-
ging, kinking, bending smaller that minimum bend radius and cutting, any of
whichcancauseprematureHosefailure. AnyHosethathasbeenkinkedorbent
to a radius smaller than the minimum bend radius, and any Hose that has been
cut or is cracked or is otherwise damaged should be removed and discarded.
2.12
Proper End Fitting: See instructions 3.2 through 3.5. These recom-
mendations 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 absorp-
tion, Hose length changes due to pressure, and Hose and machine toler-
ances and movement must be considered.
2.14
Specifications and Standards: When selecting Hose and Fittings,
government, industry, and Parker specifications and recommendations
must be reviewed 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 instructions 2.5 and 1.5. The wrong Hose may fail af-
ter 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 destructionwithout contact by such
nearby items as hot manifolds or moltenmetal. The same heat sourcemay then
initiate a fire. This can occur despite the presence of cool air around the Hose.
2.18
Welding or Brazing: When using a torch or arc welder in close proxim-
ity to hydraulic lines, the hydraulic lines should be removed or shielded with
appropriate fire resistant materials. Flame or weld spatter could burn through
the Hose and possibly ignite escaping fluid resulting in a catastrophic failure.
Heating of plated parts, including Hose Fittings and adapters, above 450°F
(232
°C) such as during welding, brazing or soldering may emit deadly gases.
2.19
Atomic Radiation: Atomic radiation affects all materials used in
Hose assemblies. Since the long-term effects may be unknown, do not
expose Hose assemblies to atomic radiation.
2.20
Aerospace Applications: The only Hose and Fittings that may
be used for in flight aerospace applications are those available from
Parker’s Stratoflex Products Division. Do not use any other Hose
or Fittings for in flight applications. Do not use any Hose or Fittings
from Parker’s Stratoflex Products Division with any other Hose or Fit-
tings, unless expressly approved in writing by the engineering man-
ager or chief engineer 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 Fittings with
quick disconnect ability can unintentionally disconnect if they are dragged
over obstructions, or if the sleeve or other disconnect member, is bumped or
moved enough to cause disconnect. Threaded Fittings should be considered
where there is a potential for accidental uncoupling.
Safety Guide