3.18.2.5Stability
Foundation
The pump unit must be installed on a base plate or on a frame placed exactly level on the founda- tion. The foundation must be hard, level, flat and vibration free to guarantee correct alignment of the pump/drive while operating. See also section 3.18.7 Guidelines for assembly and section 3.18.7.6 Shaft coupling.
Horizontal mounting
Pumps are to be mounted horizontally on the integral feet. Other kinds of installation have an influence on draining and filling, etc. If the pump/pump unit is installed differently, contact your distributor.
Support
The support under the bearing bracket is designed to absorb belt forces and vibrations while letting the pump shaft expand freely along its axis.
3.18.3 Drives
If a bare shaft pump is supplied, the user is responsible for the drive and the assembling with the pump. The user also must provide guarding of moving parts. See also section 3.18.7 Guidelines for assembly.
3.18.3.1Starting torque
•The starting torque of internal gear pumps is almost identical to the nominal torque.
•Take care that the motor has a sufficiently large starting torque. Therefore choose a motor with a capacity 25% higher than the pump power consumption.
Note! A mechanical variable speed drive requires checking of the available torque at low and high speed.
•Frequency invertors may have limited the starting torques.
•The selection of the size and performance of the magnetic coupling depends on the output torque of the drive motor during
3.18.3.2Radial load on shaft end
The shaft end of the pump shaft may be loaded in radial sense with the maximum radial force (Fr). See table.
TG MAG pump size | Fr_max [N] | |
|
| |
1000 | ||
| ||
| ||
|
| |
1800 | ||
| ||
| ||
|
| |
2500 | ||
|
|
•This force is calculated for the maxium allowable torque at the shaft end and for a bearing life of
25.000 hours.
•In case a direct drive with a flexible coupling is used, the indicated force will not be exceeded when pump and drive are well aligned.
•Starting with the TG MAG
In case of V-belt drive
The maximum allowable radial force Fr as indicated in the table may be chosen higher but must be calculated case by case in function of pressure, torque and size of the pulley. Consult your distributor for advice.
A.0500.551 – | 31 |
