Page 53 - KT_Catalog

Because we continually examine ways to improve our products, we reserve the right to alter specifications OR DISCONTINUE PRODUCTS without prior notice.
53 KKTCA0408
Please refer to the back page for the location of your nearest warehouse for availability of products/sizes shown.
NOTE : (i) Two-pass reinforcement provides improved kink resistance and pressure performance.
(ii) Suitable for transfer of emulsifable c ncentrate in undiluted form.
Considerations for Selecting and Using Spray Hose
One of the most demanding hose applications is chemical
spray, as seen in lawn care and pest control. The hose
is subject to both internal and external stress. Internal
hose stress results from the high pressures used and the
aggressive nature of the chemicals. External stress is
applied to the hose by pulling and dragging the hose, as
well as exposure to the freshly applied chemicals.
Several Kuri Tec® hoses are offered for use in chemical
spray applications and, in order to obtain optimum
performance and service life, it is essential that the proper
hose be selected and that proper care be taken in handling
the hose.
What type of chemical is being conveyed?
In general, lawn care and pest control chemicals fall into
two classifcations, based on the physical form of the
substance: wettable powders (WP) and emulsifable liquid
concentrates (EC).
Wettable powders are supplied in dry powder or granular
form and are dissolved in water to create a sprayable
solution. The substances are generally stable when in
solution and will not “settle out” when allowed to stand. All
of our pest control, lawn, and tree chemical spray hoses
will handle most of these wettable concentrates in aqueous
solutions at normal suggested concentrations.
Emulsifable concentrates are supplied in a liquid form in
which the herbicide or pesticide is dissolved in a carrier
that is itself a solvent or oil-based substance. When mixed
with water, these substances become “emulsions” in which
the chemicals are not truly dissolved in the water. When
allowed to stand, the chemicals will separate from the
water, generally foating to the top. The emulsifed carriers
themselves have an effect on the hose’s core tube and, in
combination with the other chemicals being used, can have
a signifcant effect on the hose material when they separate
and form a more concentrated phase.
For emulsifable concentrate chemicals, we suggest the
use of Kuri Tec hoses using PVC/Polyurethane blend
compounds in the core tube, such as Series A1628, A1661
and A1687. “All PVC” spray hoses such as Series K4131
are not suggested for use with these chemicals, because of
the possibility of phase separation in the mixture.
Regardless of the type of hose used with the emulsifable
concentrate chemicals, it is recommended that the hose be
drained if it is going to stand for an extended period of time,
since even on a reel the chemicals may separate out of the
water emulsion and collect in concentrated bands at the
top of the reel.
NOTE: All Kuri Tec hose suggestions are for aqueous
solutions or emulsions of the chemical herbicide, pesticide
or fertilizer in the suggested concentrations. For transfer
of an emulsifable concentrate in its pure form, a premium
chemical spray hose such as Series A4086, with its
polyethylene liner, is suggested.
At what working pressure and operating
temperature will the hose be used?
All hoses, but particularly thermoplastic hoses, are affected
by temperature. As the operating temperature rises, the
material will soften slightly and the working and burst
pressures will be reduced. It is not unusual for the hose
temperature in a lawn spraying application to rise to 120°
F. in summer. The individual pressure rating tables should
be consulted to determine the maximum working pressure
at 122° F. In general, one can expect a reduction of 40%
to 60% in the working pressure rating at 120° F., when
compared to the working pressures for the same hose at
70° F. This factor must be considered when selecting the
proper hose.
What type of fttings should be used?
As explained in the Fitting Compatibility Guide on pages
64-65, a double-barbed ftting held in place with two band
clamps appears to be the best choice for Kuri Tec spray
hoses. In addition, the use of spring guards is highly
recommended in order to prevent kinking of the hose at the
fttings. Properly crimped ferrules over multi-barbed fttings
are also suitable, provided a gap is provided at the end of
the ferrule to avoid “wicking” of the fuid along the yarn.
Summary of Suggested Spray Hose Applications
K3150 PVC PVC Clear Smooth No 250 Yes No
K4131, 32, 37 PVC PVC Yellow Ribbed Yes 600 Yes No
A1628 PVC/TPU PVC Grey Ribbed Yes 300 Yes Yes
A1661 (i) PVC/TPU PVC Yellow Ribbed Yes 600 Yes Yes
A1687 (i) PVC/TPU PVC Green Ribbed Yes 800 Yes Yes
A4086 (i) LLDPE TPE Blue Smooth Yes 800 Yes Yes (ii)
A1710S LLDPE EVA Translucent Smooth No 250 Yes Yes (ii)
K4350 EVA EVA Translucent Smooth No 150 - 250 Yes Yes (ii)
Description Suitability
Jacket Properties Working
Series Core Pressure† Wettable Emulsifable
Materials Material Color Surface Perforations (PSI @ 70°F) Powders Liquids
TECHNICAL
BULLETIN
† Note: Working Pressure decreases as temperature increases. Pressure ratings can only be obtained with proper coupling procedures.