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Parker Hannifn Corporation
Parfex Division
Ravenna, OH
Catalog Number 4200-M-2 General Technical Information
damage. These Hose assemblies for in-flight applications must meet all
applicable aerospace industry, aircraft engine, and aircraft requirements.
2.2 Pressure: Hose selection must be made so that the published maximum
recommended working pressure of the Hose is equal to or greater than
themaximumsystempressure.Surgepressuresorpeaktransientpressures
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 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: Becertain that fluidandambient temperatures, bothsteady
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 fluid. Properly insulate and protect
theHose 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 ormist fromthe conveyed fluids) contacting
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 FluidCompatibility: Hose Assembly selectionmust assure compatibility
of the Hose tube, cover, reinforcement, and Fittings with the fluid media
used. See the fluid compatibility chart in the Parker publication for the
product being considered or used. This information is offered only as a
guide. Actual service life canonly bedeterminedby theenduser by testing
under all extreme conditions and other analysis.
Hose that ischemicallycompatiblewithaparticular fluidmust beassembled
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 whenusing thewrongHose for suchapplications.
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 from outside the Hose to inside the Hose will also
occur in Hose assemblies, regardless of internal pressure. If thismoisture
permeation 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 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: Attentionmust be given to optimum routing tominimize inherent
problems (kinking or flow restriction due to Hose collapse, twisting of the
Hose, proximity to hot objects or heat sources).
2.9 Environment: Caremust be taken to insure that theHose andFittings are
eithercompatiblewithorprotectedfromtheenvironment (that is,surrounding
conditions) towhich theyareexposed. Environmental conditions including
but not limited to ultraviolet radiation, sunlight, heat, ozone, moisture,
water, salt water, chemicals, andair pollutants can causedegradationand
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 adaptersmay 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, anyof whichcancauseprematureHose failure. AnyHose that has
been kinkedor bent toa radius smaller than theminimumbend 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
recommendations may be substantiated by testing to industry standards
such as SAE J517 for hydraulic applications, or MIL-A-5070, AS1339, or
AS3517 forHoses fromParker’sStratoflexProductsDivision foraerospace
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 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
byHose requireuseof thesame typeof Hoseasusedwithpetroleumbase
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 after a very short service. Inaddition, all liquids but purewatermay
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 itemsashotmanifoldsormoltenmetal. Thesameheat 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 proximity
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 Hose available from Parker’s
Stratoflex Products Division. Do not use any other Hose or Fittings for in-
flight applications. Donot useanyHoseor Fittings fromParker’sStratoflex
Products Division with any other Hose or Fittings, unless expressly
approved in writing by the engineering manager 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 couplings with
disconnect sleeves can unintentionally disconnect if they are dragged
over obstructions or if the sleeve is bumped or moved enough to cause
disconnect. Threaded couplings should be considered where there is a
potential for accidental uncoupling.
3.0 HOSEANDFITTINGASSEMBLYANDINSTALLATIONINSTRUCTIONS
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, corrosionor other imperfections.DoNOTuseany
component that displays any signs of nonconformance.
3.2 HoseandFittingAssembly:Donot assembleaParkerFittingonaParker
Hose that is not specifically listed by Parker for that Fitting, unless
authorized in writing by the engineering manager or chief engineer of the
appropriate Parker division. Do not assemble a Parker Fitting on another
manufacturer’s Hose or a Parker Hose on another manufacturer’s Fitting
unless (i) the engineering manager or chief engineer of the appropriate
Parker division approves the Assembly in writing or that combination is
expressly approved in the appropriate Parker literature for the specific
Parker product, and (ii) the user verifies the Assembly and the application
through analysis and testing. For Parker Hose that does not specify a
Parker Fitting, the user is solely responsible for the selection of the proper
Fitting and Hose Assembly procedures. See instruction 1.4.
The Parker published instructions must be followed for assembling the
Fittings on the Hose. These instructions are provided in the Parker Fitting
catalog for the specific Parker Fitting being used, or by calling 1-800-
CPARKER, or at www.parker.com.