CAUTION
Incorrect earthing during welding work at the piping
Destruction of rolling element bearings (pitting effect)!
▷ Never earth the electric welding equipment on the pump or baseplate.
▷ Prevent current flowing through the rolling element bearings.
NOTE
Installing check and shut-off elements in the system is recommended, depending on
the type of plant and pump. However, such elements must not obstruct proper
drainage or hinder disassembly of the pump.
✓ Suction lift lines have been laid with a rising slope, suction head lines with a
downward slope towards the pump.
✓ A flow stabilisation section having a length equivalent to at least five times the
diameter of the suction flange has been provided upstream of the suction
flange.
✓ The nominal diameters of the pipes are equal to or greater than the nominal
diameters of the pump nozzles.
✓ To prevent excessive pressure losses, adapters to larger diameters have a
diffuser angle of approx. 8°.
✓ The pipelines have been anchored in close proximity to the pump and
connected without transmitting any stresses or strains.
1. Thoroughly clean, flush and blow through all vessels, pipelines and connections
(especially of new installations).
2. Before installing the pump in the piping, remove any flange covers on the
suction and discharge nozzles of the pump.
Fig. 13: Connection with expansion joints
CAUTION
Pumps connected with unbraced expansion joints
Machine damage by impermissible nozzle loads!
▷ Never connect the pump with unbraced expansion joints.
3. If the owner/operator supplies an expansion joint, it has to be braced with
external tie rods to prevent impermissible nozzle loads.
5 Installation at Site
Omega / Omega V
31 of 94
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