1
7
Installation
CHECK VALVE
EXPANSION JOINT
EXPANSION JOINT
Figur
e
15
5.7
Alignment
Pumping equipment is assembled and aligned at the
factory by qualified personnel, however, during
transportation or handling, the equipment can suffer
stresses that can cause misalignment between the
pump and the motor, which can lead to bearing and
coupling failures. Therefore it is important to check and
correct the alignment when necessary, see illustration
14. If the equipment handles high temperature fluids,
the final alignment should be done with the equipment
at operating temperature.
The equipment should always be aligned after
everything is assembled and ready for start-up. The
correct alignment of the standard coupling consists of
correcting the possible errors of parallelism and
concentricity, using calibrated laims in the motor.
Angular Misalignment
Parallel Misalignment
Figur
e
16
Installation
5.6
Expansion Joint
Dimensional changes in piping and equipment, caused by variations in the working temperature of the piping system and the
pump, either by the temperature of the pumped fluid or by exposure to changing environmental conditions, result in large
magnitude stresses and forces that are transmitted to the pumping equipment and can damage it. That is why VOGT S.A.,
recommends the use of expansion joints as part of the piping system that connects to the pump, when conditions warrant it, see
figure 15.
Even though the absorption of axial movements, caused by temperature changes, is the main work performed by the expansion
joints, they also act as vibration isolators reducing the propagation of vibrations, produced by the operation of the equipment,
through the piping system and also act as compensators of lateral, angular and torsional movements.