Page 65 - KT_Catalog

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65 KKTCA0408
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leak resistance without risk of damage to the core tube or
deterioration of the yarn reinforcement due to wicking.
Hose failure near a ftting
A hose is most susceptible to failure near the ftting. The
installation of the ftting involves some risk of damage to
the core tube. There is also some possibility of slight
leakage along a ftting and subsequent yarn wicking,
particularly if a one-piece crimped ftting is used. The
greatest amount of fexing often occurs near the ftting at
either the supply or service end of the hose.
In the investigation of a hose failure near the ftting, it is
essential that the ftting/hose interface be examined. In the
feld, if the failure or deterioration is isolated to the area
near the ftting, it is best to cut off the end of the hose,
reinstall a new ftting, and monitor the hose in service to
see if the problem reoccurs.
If the problem involves a spray hose and fuid slowly
leaking through the cover perforations near the ftting, the
most likely cause is wicking along the reinforcing yarn from
the end of the hose or from a cut or break in the core tube.
Such wicking can extend over several feet and a leak may
be seen at a considerable distance from the source of the
leak.
If a hose is being returned to the supplier for investigation
of a failure, it is essential that the ftting . . . or at least the
section of hose in contact with the ftting . . . be returned.
Only by examining the inner surface of the tube that was in
contact with the ftting can one determine with certainty if
the problem began at the ftting.
WARNING
The above comments and ftting suggestions are intended
for use as guidelines only. The information provided is
based on tests which we believe to be reliable and on
our past observations and experience. No warranty is
expressed or implied, as applications and methods of
ftting installation can vary widely. Before placing a hose
in service, the user must determine the suitability of the
ftting and hose/tube for his or her intended use. The user
assumes all risk and liability resulting from the use of any
Kuri Tec product with any ftting whatsoever.
Temperature Dependence of Pressure Rating
As a general rule, the working pressure ratings for
plastic reinforced hoses are based on room temperature
conditions. The maximum allowable pressure for a
hose decreases as the temperature increases and the
material becomes softer and more elastic. Fitting retention
decreases at higher temperatures as the compression on
the material declines.
Working pressure ratings can be affected signifcantly by
the type of ftting used, the method of attachment, and
the temperature to which the hose assembly is exposed
in service. Repeated intermittent periods of exposure to
elevated temperatures can affect ftting retention and it is,
therefore, very diffcult to assign working pressure ratings
at high temperatures. The graph below demonstrates the
overall trend.
Working pressure ratings are given in this catalog at 70°F
and 122°F. Between 122°F and the maximum service
temperature, it must be noted that a rapid decline in the
pressure rating of the hose may occur, and all factors
relating to the hose, fttings and service conditions must be
taken into consideration.
No warranty is expressed or implied, as applications and
methods of ftting installation may vary widely. Before
placing a hose in service, the user must determine
the suitability of the product under the correct working
conditions, and assumes all risk and liability in connection
therewith.
Burst strength
decreases as
temperature
increases
Working Pressure Ratings
FITTING SUG
GESTIONS