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3.4.4 Mechanical shaft seals
Mechanical shaft seals require no maintenance or adjustment.
CVM and CHM pumps equipped with mechanical shaft seals are
matched to the operating conditions for which the pump was sold.
Observe the following precautions to avoid shaft seal damage
and to obtain maximum shaft seal life:
Clean and purge the inlet pipe in new installations before
installing and operating the pump. Pipe scale, welding slag and
other abrasives can cause rapid shaft seal failure.
3.4.5 Coupling alignment of CHM pumps
The pump and motor were accurately aligned from factory, but
handling during shipment usually alters this pre-alignment.
1. If the pump and motor were shipped mounted on a common
base frame as an assembly, remove the coupling guard.
2. Checking parallel alignment
Place a straight edge across both coupling rims at the top, the
bottom and both sides. See fig. 4. After each adjustment,
recheck all features of alignment. Parallel alignment is correct
when the measurements show that all points of the coupling
faces are within ± 0.127 mm of each other.
If misalignment is detected, loosen the motor and shift or shim
as necessary to realign. Then retighten the anchor bolts.
Always align the motor to the pump as pipe strain will occur if
the pump is shifted. Never reposition the pump on the base
frame.
Fig. 4 Checking parallel alignment
3. Checking angular alignment
Insert a pair of inside callipers or a taper gauge at four points
at 90 ° intervals around the coupling. See fig. 5. Angular
alignment is correct when the measurements show that all
points of the coupling faces are within ± 0.127 mm of each
other.
– If misalignment is detected, loosen the motor and shift or
shim as necessary to realign. Then retighten the anchor
bolts. Always align the motor to the pump as pipe strain will
occur if the pump is shifted. Never reposition the pump on
the base frame.
Fig. 5 Checking angular alignment
– Check shaft alignment once again after final pipe
connections to the pump have been made, motor wiring
verified, correct direction of rotation has been established,
and pipes have been filled with liquid.
4. Leave the coupling guards off until the pump priming
procedure has been completed.
5. Install the coupling guards after installation has been
completed to protect persons from rotating machinery.
3.5 Electrical connection
The electrical connections must be carried out by an authorised
electrician in accordance with local regulations.
The operating voltage and frequency are marked on the motor
nameplate.
Make sure that the motor is suitable for the power supply of the
installation site.
Carry out the electrical connections as shown on the motor
nameplate or in the wiring diagram on the back of the terminal
box cover.
For further information, contact the motor supplier.
Do not run the pump dry or against a closed valve.
Dry running will cause shaft seal failure within
minutes.
Do not exceed the temperature or pressure
limitations for the mechanical shaft seal used.
TM07 3631 5218
TM07 3632 5218
DANGER
Electric shock
Death or serious personal injury
- Before you remove the terminal box cover and
before you remove or dismantle the pump, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
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