Page 413 - Catalog4400.pdf

E-55 Hose Products Division
Parker Hannifn Corporation
Wickliffe, Ohio
www.parkerhose.com
Technical Catalog 4400 US
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2.2 Pressure: Hose selection must be made so that the published maxi-
mum 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 pressures 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 pres-
sure ratings for Hose is for manufacturing test purposes only and is no indication
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 fuid and ambient temperatures, both
steady and transient, do not exceed the limitations of the Hose. Temperatures
below and above the recommended limit can degrade Hose to a point where a
failure may occur and release fuid. Properly insulate and protect the Hose As-
sembly 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 fuids (or
vapors or mist from the conveyed fuids) contacting any open fame, molten metal,
or other potential fre ignition source that could cause burning or explosion of the
conveyed fuids or vapors.
2.5 Fluid Compatibility: HoseAssembly selection must assure compatibility
of the Hose tube, cover, reinforcement, and Fittings with the fuid media used.
See the fuid compatibility chart in the Parker publication 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 fuid 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 materials as helium,
diesel fuel, gasoline, natural gas, or LPG). This permeation may result in high
concentrations of vapors which are potentially fammable, explosive, or toxic, and
in loss of fuid. Dangerous explosions, fres, 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 fuid compatibility
is acceptable without considering the potential hazardous effects that can result
from permeation through the Hose Assembly.
Permeation of moisture from outside the Hose to inside the Hose will also occur
in Hose assemblies, regardless of internal pressure. If this moisture permeation
would have detrimental effects (particularly, but not limited to refrigeration and air
conditioning systems), incorporation of suffcient 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 fuid varies
with pressure and rate of fow. The size of the components must be adequate to
keep pressure losses to a minimum and avoid damage due to heat generation or
excessive fuid velocity.
2.8 Routing: Attention must be given to optimum routing to minimize
inherent problems (kinking or fow restriction due to Hose collapse, twisting of the
Hose, proximity to hot objects or heat sources). For additional routing recommen-
dations see SAE J1273 and ISO 17165-2. Hose Assemblies have a fnite 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 water,
chemicals and air pollutants can cause degradation and premature failure.
2.10 Mechanical Loads: External forces can signifcantly reduce Hose
life or cause failure. Mechanical loads which must be considered include ex-
cessive fexing, 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 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 Stratofex Products Division for aerospace applications.
2.13 Length: When establishing a proper Hose length, motion absorption,
Hose length changes due to pressure, and Hose and machine tolerances and
movement must be considered.
2.14 Specifcations and Standards: When selecting Hose and Fittings,
government, industry, and Parker specifcations 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 fre resistant fuids that are to be con-
veyed by Hose require use of the same type of Hose as used with petroleum
base fuids. Some such fuids require a special Hose, while a few fuids will not
work with any Hose at all. See instructions 2.5 and 1.5. The wrong Hose may fail
after a very short service. In addition, all liquids but pure water may burn fercely
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 manifolds or molten metal. The same heat source
may then initiate a fre. 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 prox-
imity to hydraulic lines, the hydraulic lines should be removed or shielded with
appropriate fre resistant materials. Flame or weld spatter could burn through the
Hose and possibly ignite escaping fuid 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 AerospaceApplications: The only Hose and Fittings that may be used
for in fight aerospace applications are those available from Parker’s Stratofex
Products Division. Do not use any other Hose or Fittings for in fight applications.
Do not use any Hose or Fittings from Parker’s Stratofex Products Division with
any other Hose or Fittings, unless expressly approved in writing by the engineer-
ing manager or chief engineer of Stratofex Products Division and verifed 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.
3.0 HOSE AND FITTING ASSEMBLY AND INSTALLATION
INSTRUCTIONS
3.1 Component Inspection: Prior to assembly, a careful examination of
the Hose and Fittings must be performed. All components must be checked for
correct style, size, catalog number, and length. The Hose must be examined for
cleanliness, obstructions, blisters, cover looseness, kinks, cracks, cuts or any
other visible defects. Inspect the Fitting and sealing surfaces for burrs, nicks,
corrosion or other imperfections. Do NOT use any component that displays any
signs of nonconformance.
3.2 Hose and Fitting Assembly: Do not assemble a Parker Fitting on a
Parker Hose that is not specifcally listed by Parker for that Fitting, unless autho-
rized in writing by the engineering manager or chief engineer of the appropriate
Parker division. Do not assemble a Parker Fitting on another manufacturer’s
Safety Guide