Plumbing Connection 1-2015

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CTION AUTUMN 2015 47
order to get the highest safety level and durability, different
o-rings are used for different applications. Each o-ring
has different properties that make it most suitable for the
application, for instance EPDM water o-ring has the best
hygienic proprieties for drinking water, the gas HNBR o-ring
has ceramic particles to hold the seal for a period of time
in case of fire and the FKM red o-ring is best suited to deal
with higher temperatures,” Adam explains.
In addition to the different coloured O-ring, the gas (yellow
o-ring) and high temperature (red o-ring) fittings have
markings on the outside of the fitting to identify them.
Mechanical press tools that only require one hand
operation make the connection process quick and easy by
clamping over the joints and securing them with the press
of a button. While simple, Adam explains that there are
some things plumbers need to know to ensure a secure
connection. Three key factors include:
∫ The applications
∫ The installation
∫ Tool maintenance
THE APPLICATIONS
Plumbers should always check the manufacturers’
manual to ensure that copper press-fitting is suitable for
the application. While copper press-fittings can be used in
most applications where you would normally use a standard
copper fitting there are some limitations. This is because
the press-fitting also contains an o-ring and therefore the
o-ring as well as the copper needs to be suitable for the
temperature, pressure and medium that is flowing through
the pipe.
THE INSTALLATION
To ensure a successful joint, it is critical that all steps in
the manufacturers’ installation instructions be followed.
Generally speaking though, the following steps are
required to be taken for a successful joint to take place:
∫ It is important to ensure that the pipe is cut completely
square.
∫ Make sure that the internal and external tube end are free
from burrs or sharp edges by using a deburring tool to
prevent damage to the o-ring.
∫ Ensure pipe is inserted up to the tube stop.
∫ Put a witness mark (Black marker or texta) on the right
engagement depth and ensure the pipe is fully
engaged when pressing.
∫ Check all fittings have been pressed (inspection).
TOOL MAINTENANCE
There are three things that impact on a successful joint:
the fitting, the copper and the tool; therefore it is important
that the tool is well maintained and serviced regularly.
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