WKT
14
Never run the pump dry!
Open or switch on all auxiliary lines (cooling, lubrication,
sealing liquid etc) and ensure they are not blocked.
For water cooling, use suitable non-aggressive cooling
water not liable to form deposits and not containing
suspended solids. (Hardness: on average 5dH; (~1
mmol/l); pH > 8, or conditioned and neutral with regard to
mechanical corrosion).
Inlet temperature t
E
= 10 to 30ºC
Outlet temperature t
A
max. 45ºC
Dry running of the pump will result in
mechanical seal failure and must be
avoided!
6.1.6.2 Cooling
In general, the shaft seal must be cooled
if the vaporization pressure of the fluid
handled is higher than the atmospheric pressure.
Depending on the fluid handled, the system pressure and
the mechanical seal material, the limit may change
(example: hot water).
Observe permissible temperature
classes.
6.1.7 Checking the direction of rotation
When the unit has been connected to the electric power
supply, verify the following (local and national regulations
have to be taken into account separately):
For trouble-free operation of the pump,
the correct direction of rotation of the
impeller is of paramount importance. If running in the
wrong direction of rotation, the pump cannot reach its
duty point; vibrations and overheating will be the
consequence. The unit or the shaft seal might be
damaged.
Correct direction of rotation:
The direction of rotation must correspond to the direction
indicated by the arrow on the pump.
Never put your hands or any other objects into the
pump.
The motor’s direction of rotation
must be checked with the
pump/motor coupling removed.
If the motor runs in the wrong direction of rotation,
interchange two of the three phases in the control cabinet
or motor terminal box.
The safety instructions set forth in section 2.9.3 must be
complied with.
Fig. 16 – Decoupled drive
6.2 Start-up
Before starting the pump ensure that the shut-off element
in the suction line (if any) is fully open.
The pump may be started up against a closed discharge-
side swing check valve or slightly open shut-off valve.
Only after the pump has reached full rotational speed
shall the shut-off valve in the discharge line be opened
slowly and adjusted to comply with the duty point. When
starting up against an open discharge-side shut-off valve,
take the resulting increase in input power into account!
Pump operation with the shut-off
valves in the discharge and
suction pipes closed is not permitted.
The permissible pressure and temperature limits might be
exceeded. In extreme cases, the pump may burst.
After the operating temperature has
been reached and / or in the event of
leakage, switch off the unit and re-tighten the applicable
bolts. Permissible tightening torques see 7.5.3.
Check the coupling alignment at
operating temperature as described in
section 5.6 and re-align, if necessary.
Immediate steps after start up
After start up and with pump in process, please observe
the following items:
a) Control electric power consumption (amperage) and
voltage;
b) Certify that the pump runs free of vibration and
abnormal noises;
c) Control support bearing temperature, which can
reach up to 40ºC above ambient temperature;
however the sum of them cannot exceed 82ºC.
The above items should be controlled each 15 minutes
during the first 2 hours operation. If everything is normal,
new controls should be made each 1 hour, during the first
5 up to 8 hours. If there is anything abnormal during this
period, please consult chapter Functioning Abnormalities
and its eventual Causes.
6.2.1 Minimum flow
(For the protection of the pump when operating at low
loads).
Caution
Caution
Caution
Caution
Caution
Caution
Caution
Caution
Caution
Back to suction
(in vapour state)
To Next Page
