Parker Hannifin Corporation
Hose Products Division
Wickliffe, OH
20
Crimping Machine
PHastkrimp
Bulletin 4480-T15-US
Parker manufacturers special Hose for aerospace in flight applications.
Aerospace in flight applications employing Hose to transmit fuel, lubricating fluids
and hydraulic fluids require a special Hose with a conductive inner tube. This
Hose for in flight applications is available only from Parker’s Stratoflex Products
Division. Do not use any other Parker Hose for in flight applications, even if
electrically conductive. Use of other Hoses for in flight applications or failure to
properly connect or ground this Hose can cause a fire or an explosion resulting
in death, personal injury , and property 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 the maximum system pressure. 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 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 fluid 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 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) 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
Fluid Compatibility: Hose Assembly selection must 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 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 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 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 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: 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).
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 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 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
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 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 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 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 manifolds or molten metal. The same heat source
may 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 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 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 accidential
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 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
manufacturers Hose or a Parker Hose on another manufacturers 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
Safety Guide for Selecting and Using Hose, Fittings and Related Accessories
www.comoso.com
