Parker Hannifin Corporation
| Parflex
®
Division | Ravenna, Ohio |
For detailed ordering information, please consult price list or contact Parflex
®
Division.
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G-64
4.4
Functional Test:
Operate the system at maximum operating pressure
and check for possible malfunctions and leaks. Personnel must avoid
potential hazardous areas while testing and using the system. See section 2.2.
4.5
Replacement Intervals:
Hose assemblies and elastomeric seals
used on Hose Fittings and adapters will eventually age, harden, wear and
deteriorate under thermal cycling and compression set. Hose Assemblies
and elastomeric seals should be inspected and replaced at specific
replacement intervals, based on previous service life, government or industry
recommendations, or when failures could result in unacceptable downtime,
damage, or injury risk. See section 1.2. Hose and Fittings may be subjected
to internal mechanical and/or chemical wear from the conveying fluid and
may fail without warning. The user must determine the product life under
such circumstances by testing. Also see section 2.5.
4.6
Hose Inspection and Failure:
Hydraulic power is accomplished by
utilizing high pressure fluids to transfer energy and do work. Hoses, Fittings
and Hose Assemblies all contribute to this by transmitting fluids at high
pressures. Fluids under pressure can be dangerous and potentially lethal and,
therefore, extreme caution must be exercised when working with fluids under
pressure and handling the Hoses transporting the fluids. From time to time,
Hose Assemblies will fail if they are not replaced at proper time intervals.
Usually these failures are the result of some form of misapplication, abuse,
wear or failure to perform proper maintenance. When Hoses fail, generally
the high pressure fluids inside escape in a stream which may or may not
be visible to the user. Under no circumstances should the user attempt to
locate the leak by “feeling” with their hands or any other part of their body.
High pressure fluids can and will penetrate the skin and cause severe tissue
damage and possibly loss of limb. Even seemingly minor hydraulic fluid
injection injuries must be treated immediately by a physician with knowledge
of the tissue damaging properties of hydraulic fluid.
If a Hose failure occurs, immediately shut down the equipment and leave the
area until pressure has been completely released from the Hose Assembly.
Simply shutting down the hydraulic pump may or may not eliminate the
pressure in the Hose Assembly. Many times check valves, etc., are employed
in a system and can cause pressure to remain in a Hose Assembly even when
pumps or equipment are not operating. Tiny holes in the Hose, commonly
known as pinholes, can eject small, dangerously powerful but hard to see
streams of hydraulic fluid. It may take several minutes or even hours for the
pressure to be relieved so that the Hose Assembly may be examined safely.
Once the pressure has been reduced to zero, the Hose Assembly may be
taken off the equipment and examined. It must always be replaced if a
failure has occurred. Never attempt to patch or repair a Hose Assembly that
has failed. Consult the nearest Parker distributor or the appropriate Parker
division for Hose Assembly replacement information.
Never touch or examine a failed Hose Assembly unless it is obvious that the
Hose no longer contains fluid under pressure. The high pressure fluid is
extremely dangerous and can cause serious and potentially fatal injury.
4.7
Elastomeric seals:
Elastomeric seals will eventually age, harden,
wear and deteriorate under thermal cycling and compression set. Elastomeric
seals should be inspected and replaced.
4.8
Refrigerant gases:
Special care should be taken when working
with refrigeration systems. Sudden escape of refrigerant gases can cause
blindness if the escaping gases contact the eye and can cause freezing or
other severe injuries if it contacts any other portion of the body.
4.9
Compressed natural gas (CNG):
Parker CNG Hose Assemblies should
be tested after installation and before use, and at least on a monthly basis per
ANSI/IAS NGV 4.2-1999; CSA 12.52-M99 Section 4.2 “Visual Inspection Hose/
Fitting”. The recommended procedure is to pressurize the Hose and check
for leaks and to visually inspect the Hose for damage. Caution: Matches,
candles, open flame or other sources of ignition shall not be used for Hose
inspection. Leak check solutions should be rinsed off after use.
5.0
HOSE STORAGE
5.1
Age Control:
Hose and Hose Assemblies must be stored in a
manner that facilitates age control and first-in and first-out usage based
on manufacturing date of the Hose and Hose Assemblies. The shelf life of
rubber Hose or Hose Assemblies that have passed visual inspection and a
proof test is 10 years (40 quarters) from the date of manufacture. The shelf
life of thermoplastic and polytetrafluoroethylene Hose or Hose Assemblies is
considered to be unlimited.
5.2
Storage:
Stored Hose and Hose Assemblies must not be subjected
to damage that could reduce their expected service life and must be
placed in a cool, dark and dry area with the ends capped. Stored Hose and
Hose Assemblies must not be exposed to temperature extremes, ozone,
oils, corrosive liquids or fumes, solvents, high humidity, rodents, insects,
ultraviolet light, electromagnetic fields or radioactive materials.