Appendix A - Sae J1273 May 1986 - Greenlee Fairmont HG3505A Instruction Manual

Appendix A
SELECTION, INSTALLATION AND MAINTENANCE
OF HOSE AND HOSE ASSEMBLIES
- SAE J1273 MAY 1986*
SAE RECOMMENDED PRACTICE
The following recommendations on selection, installa-
tion and maintenance of hose and hose assemblies was
established by the S.A.E. in 1979 and reaffirmed May
1986. Please read these general instructions carefully.
1. SCOPE
Hose (also includes hose assemblies) has a finite life and
there are a number of factors which will reduce its life.
This recommended practice is intended as a guide to
assist system designers and/or users in the selection,
installation, and maintenance of hose. The designers
and users must make a systematic review of each
application and then select, install, and maintain the
hose to fulfill the requirements of the application. The
following are general guidelines and are not necessarily
a complete list.
Improper selection, installation or maintenance
may result in premature failures, bodily injury, or
property damage.
2. SELECTION
The following is a list of factors which must be consid-
ered before final hose selection can be made.
2.1 Pressure - After determining the system pressure,
hose selection must be made so that the recommended
maximum operating pressure is equal to or greater than
the system pressure. Surge pressures higher than the
maximum operating pressure will shorten hose life and
must be taken into account by the hydraulic designer.
2.2 Suction - Hoses used for suction applications must
be selected to insure the hose will withstand the nega-
tive pressure of the system.
2.3 Temperature - Care must be taken to insure that
fluid and ambient temperatures, both static and tran-
sient, do not exceed the limitations of the hose. Special
care must be taken when routing near hot manifolds.
2.4 Fluid Compatibility - Hose selection must assure
compatibility of the hose tube, cover, and fittings with
fluid used. Additional caution must be observed in hose
selection for gaseous applications.
Greenlee Textron / Subsidiary of Textron Inc.
HG3505A / 42303 Portable Power Unit
2.5 Size - Transmission of power by means of pressur-
ized 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 to the hose due
to heat generation or excessive turbulence.
2.6 Routing - Attention must be given to optimum
routing to minimize inherent problems.
2.7 Environment - Care must be taken to insure that the
hose and fittings are either compatible with or protected
from the environment to which they are exposed.
Environmental conditions such as ultraviolet light,
ozone, salt water, chemicals, and air pollutants can
cause degradation and premature failure and, therefore,
must be considered.
2.8 Mechanical Loads - External forces can significantly
reduce hose life. 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 in the hose. Unusual applications
may require special testing prior to hose selection.
2.9 Abrasion - While a hose is designed with a reason-
able level of abrasion resistance, care must be taken to
protect the hose from excessive abrasion which can
result in erosion, snagging and cutting of the hose
cover. Exposure of the reinforcement will significantly
accelerate hose failure.
2.10 Proper End Fitting - Care must be taken to insure
proper compatibility exists between the hose and
coupling selected based on the manufacturer's recom-
mendations substantiated by testing to industry stan-
dards such as SAE J517d (November, 1976).
2.11 Length - When establishing proper hose length,
motion absorption, hose length changes due to pres-
sure, as well as hose and machine tolerances must be
considered.
2.12 Specifications and Standards - When selecting
hose, government, industry, and manufacturer's specifi-
cations and recommendations must be reviewed and
applicable.
2.13 Hose Cleanliness - Hose components vary in
cleanliness levels. Care must be taken to insure that the
assemblies selected have an adequate level of cleanli-
ness for the application.
2.14 Electrical Conductivity - Certain applications
require that the hose be non-conductive to prevent
electrical current flow. Other applications require the
hose to be sufficiently conductive to drain off static
electricity. Hose and fittings must be chosen with these
needs in mind.
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