TPT January 2008

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January 2008 112 ›
W hether the assembly method of choice
is soldering, brazing, welding, or by
epoxy adhesive – a tubular joint must be
strong, leakproof, and corrosion-resistant.
The responsibility for satisfying these
expectations rests largely with the connecting
device, and it is a heavy one. Add economy
to the list of essentials, and the pressure is
really on for fittings and couplings.
As it happens, pressure is their medium.
The precision-milled fittings and couplings
available to today’s tubemakers are
designed to withstand the same conditions –
extremes of temperature, vibration, corrosion, abrasion – that may confront the workpieces they connect.
Establishing a connection is much easier when the elements are fabricated to mate. The joint is also far
likelier to prove reliable over the service life of the construction.
Prior to installation, adapters, unions, tees, and elbows may not make an especially impressive showing.
Tubemakers are not deceived. They see each small device for what it is: a precision component, designed
for a particular joining requirement, integral to the resulting assembly.
Brennan Industries Inc, USA, is an
international supplier of hydraulic fittings
and adapters. The company’s product
range includes a line of high-quality, double
ferrule, instrumentation grade tube fittings
that provide leakproof and torque-free seals
at all tubing connections.
The tube fitting line reduces the chance
of hazardous and expensive leaks in
instrumentation, process, pneumatic,
hydraulic, gas and other tubing systems. It
consists of the nut, back ferrule, front ferrule
and body. When installed, it becomes a
five-piece connection with the addition of
the tubing providing a solid leak-free joint.
The two ferrules are tightly swaged around
the tube, and the lack of initial strain on
the tubing ensures no tubing wall damage.
Leaks are prevented because there is an
axial movement along the tube instead of
a rotary motion creating the
joint. This axial movement
prevents torque from being
transmitted from the fitting to
the tubing.
The fittings are resistant
to temperature change,
do not significantly reduce
flow area, and work with
a variety of tube materials.
In addition, the two ferrule
action supersedes variations in
wall thickness, hardness and
dimensional tolerance of tube,
compensating for most variables that lead
to failure with other fittings.
Brennan double ferrule compression tube
fittings can be remade several times, and
can withstand heavy impulse and vibration
in both vacuum and pressure systems.
Requiring no special tools for installation
or torque for initial make up and using only
geometry, the fitting requires 1¼ turns to
be tightly fitted.
Supplying a wide range of industries
throughout the world, Brennan offers more
than 15,000 standard and special products
in sizes ranging from 1/8 " to 2½".
Products include pipe and straight-thread
fittings, O-ring face-seal fittings, 37° flare
tube fittings, bite-type fittings, DIN fittings,
international fittings and adapter unions.
Most products are available in carbon steel,
stainless steel and brass, and meet or
exceed JIC, SAE and other specifications.
Brennan Industries Inc – USA
Fax: +1 440 248 7282
Website:
Fittings, Couplings & Tubular Joints
Instrumentation fittings for leakproof connection
fi A selection of fittings from Brennan Industries