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Instructions for Joining Expansion Joints to Pumps
Connect the expansion joints as close as possible to the pump flange.
When using centrifugal pumps to convey abrasive agents, do not install the expansion
joints directly next to the connection piece of the pump (suction/pressure side). Otherwi-
se, the expansion joints may be damaged by high relative speeds caused by swirls and
whirls at the connection piece of the pump.
The mounting distance between the connection piece of the pump and the expansion
joint should be between 1 and 1.5 x DN.
Do not operate pumps against partly or fully closed slide gates or flaps. Avoid cavita-
tions, too, as they can destroy the expansion joint very quickly.
Commissioning
To make sure they can be installed correctly, the PTFE expansion joints, type P-1, are
equipped with a transport locking system (three limit screws) when delivered. The limit
screws are no force-absorbing elements like traction rods; therefore, they must be re-
moved prior to commissioning.
Lateral expansion joints (type P-2 and type P-4) are set to an overall length of BL when
delivered. After installation, the traction rods must have a force-closed connection to the
flanges.
Only check the pressure and tightness after the fixed points and guide bearings have
been properly installed; otherwise, the expansion joint will be extended and become
unserviceable.
If the operating temperature is high, take protective measures to avoid personal injuries
caused by touching the hot surfaces.
To ensure a reliable operation, expansion joints may only be operated within the admis-
sible pressure, temperature, and movement limits. The maximal permissible operating
pressure of rubber expansion joints stated in the data sheets refers to a temperature
of 20 °C. For higher temperatures the pressure must be reduced as the strength of the
bellows' materials diminishes with rising temperature. (When unknown, please contact
the manufacturer.)
By explaining the system, supervising the operating personnel, and providing operating
instructions, the operator must take measures to prevent wrong use of the expansion
joints.
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