How
the Crimp-Tite® Process Works
The
Crmp-Tite® process incorporates four components:
fitting insert(stem), crimp ferrule (collar),
composite rubber seal and Crimp-Tite® braided
metal hose. The fitting stem and the collar are
positively locked together during radial-compression
crimping. This method of attachment enables the
hose assembly to be used to the maximum working
pressure of the particular hose style and size.
Hose pressure ratings are based on a minimum 4:1
safety ratio, burst to operating pressure.
A
fluoroelastomeric seal provides the broadest resistance
to chemical and thermal deterioration, although
seal material can vary depending upon operation
temperature and flow media. Seals made from buna
and silicone have been tested with the same results
as the fluoroelastomer at the ambient temperature.
The
seal is molded into a shape to fit the hose convolution
geometry (illustration above). First, the barbed
stem is inserted into the inside diameter of the
seal. The barbs lock onto the seal making it difficult
to remove. then, the crimp collar (with circumferential
grooves on the I. D.) is pulled on to the O. D.
of the braided hose assembly and the stem and
the collar are threaded together. Once the fitting
is assembled, the collar is crimped 360° to
form a positively locked system with the hose,
braid and seal compressed between the barbs on
the stem and the grooves in the collar. The stem
and the collar are positively locked to assure
a tight liquid / gas seal.
The
initial fitting system is made to allow many standard
end attachments (JIC, female coupling, floating-flange
stub end or union). The fitting components and
seal are designed to mate with a specific Crimp-Tite®
hose style. The fitting system is not interchangeable
between hoses with different I. D. and O. D. dimensions.
The Crimp-Tite® system is a certified system
using certified components. Only authorized distributors
are permitted to package and promote the system.
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Crimp-Tite®
Verification Tests
Pressure
Test (Hydrostatic
@ 70 F) - Crimp-Tite® assemblies test higher
for burst pressures than assemblies due to absence
of heat-affected areas from welding.
Low-Pressure
Pneumatic Test (Nitrogen Bubble at 30
psi) No leaks
Ultra-high
Vacuum test with Helium No leaks at 1
x 10-9 cc/sec
Impulse
Test (Hydraulic oil alternation between
0 and 375 psi at 27 cycles/min) - Exceeded 150,000
cycles
ISO
10380 (Cantilever and U-Bend test) Exceeded
requirements
Saturated
Steam (Duration: 312 hours; Temperature
Range: 450 to 525°F; Pressure Range: 422 to
847 psi) - No Leaks
Crimp-Tite®
321SS Metal Hose with Braid
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