Metraflex
Elastomer
Flexible Pipe Connectors & Expansion Joints
 Specified by Consulting
Engineers, and installed in piping systems throughout the
world, Metraflex elastomer connectors isolate vibration
and noise in piping systems.
Pumps, chillers, fan coil units, and other rotating
equipment generate vibrations that are not only annoying,
but can be damaging to piping and ancillary equipment.
Although isolation base,,: using springs, rubber or cork
can effectively isolate equipment vibration from the
building structure, flexible pipe connectors are
necessary to isolate this vibration and noise from the
piping system. Metraflex elastomer connectors have an
acoustical impedance 500 times greater than steel pipe
and thus diminish noise and vibration i the piping
system.
Thermal movement, pulsation, misalignment, and
electrolysis are also effectively controlled by the
correct use of Metraflex elastomer connectors
In the early years, most connectors and joints were
manufactured of natural rubber and were hand-made. Today,
synthetic materials such as Neoprene, Buna-N, Butyl, EPDM
and Teflon are widely used. The fabric material which
gives the connector its strength is commonly made of
nylon, dacron or polyester.
These improved materials allow today's
connectors to operate at higher pressures and
temperatures and provide more resistance to chemicals,
ozone and aging. This improvement in design and
manufacturing technology allows greater movement,
flexibility and better sealing integrity.
Due to all of these product advancements, the
effectiveness of Metraflex elastomer connectors and
joints has been significantly increased while the cost
has steadily declined.
Selectinq
the proper Connector and Joint
Pressure. Select a connector with a higher
maximum working pressure than that of the system.
Connectors have a substantial safety factor, however,
exceeding the maximum working pressure is not
recommended. Maximum test pressure is I- 112 times
working pressure.
Temperature. Elastomers lose strength rapidly when
subjected to excessive temperatures. Selec a joint
capable of operating at the maximum system temperature.
Movement. Movement capability is not critical
in applications where vibration isolation is the prime
objective. However, it is advisable to provide for some
thermal movement and misalignment. When used as an
expansion j . oint, the amount and direction of movement
must be considered.
Proper
Installation
With rotating equipment, the greatest vibratory
amplitude is at right angles to the shaft. Flexible
connectors are most effective when installed parallel to
the rotating shaft so they can move laterally.
Pipe headers should be anchored and not suspended from
hangers.
If piping is not anchored, and supported, control
units must be installed to prevent excessive
stretching of the connector due to system pressure
thrust. (see page 7.)
Connectors should be installed at listed face to face
dimensions and never stretched, compressed or torqued
beyond specified limits.
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