Page 37 - ParkerPVCHose

Catalog 4830
Parker Hannifin Corporation 35 www.parker.com/indhose
Industrial Hose Division IHP Customer Service: 440-268-2400
Strongsville, OH Toll Free (866) 810-HOSE or 866-810-4673
Parker Safety Guide
cause a fire or an explosion resulting in death, personal injury , and prop-
erty 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 pres-
sures in the system must be below the published maximum working pres-
sure 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. Im-
properly 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) con-
tacting 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 applica-
tions. The system designer must take into account the fact that this per-
meation will take place and must not use Hose if this permeation could be
hazardous. The system designer must take into account all legal, govern-
ment, insurance, or any other special regulations which govern the use of
fuels and refrigerants. Never use a Hose even though the fluid compat-
ibility 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 mois-
ture permeation would have detrimental effects (particularly, but not lim-
ited to refrigeration and air conditioning systems), incorporation of suffi-
cient 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 inher-
ent 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, sur-
rounding conditions) to which they are exposed. Environmental condi-
tions including but not limited to ultraviolet radiation, sunlight, heat, ozone,
moisture, water, salt water, chemicals, and air pollutants can cause deg-
radation and premature failure.
2.10 Mechanical Loads: External forces can significantly reduce Hose life or
cause failure. Mechanical loads which must be considered include ex-
cessive flexing, twist, kinking, tensile or side loads, bend radius, and vi-
bration. 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, snag-
ging, 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 recommen-
dations 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 appli-
cations.
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, gov-
ernment, 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 cata-
strophic failure. Heating 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 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 ap-
proved 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 discon-
nect. Threaded couplings should be considered where there is a poten-
tial 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 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