7.3 Blanking flanges
For twin-head pumps, a blanking flange with a pump
housing gasket is available. See the figure below.
TM006360
Fitting the blanking flange
If one pump requires service, the blanking flange is
fitted to allow the other pump to continue operating.
7.4 Maintaining the product
DANGER
Electric shock
Death or serious personal injury
‐ Before starting any work on the
product, make sure that the power
supply has been switched off and that
it cannot be accidentally switched on.
WARNING
Escaping liquid
Death or serious personal injury
‐ Make sure that the escaping liquid
does not cause injury to persons or
damage to the motor or other
components. In hot-liquid installations,
pay special attention to the risk of
injury caused by scalding hot liquid. In
cold-liquid installations, pay special
attention to the risk of injury caused by
the cold liquid.
7.4.1 Pump
The pump is maintenance-free.
If the pump is to be drained for a long period of
inactivity, inject a few drops of silicone oil on the shaft
between the motor stool and the coupling. This will
prevent the shaft seal faces from sticking.
TP 25-50/2, 25-80/2, 25-90/2, 32-50/2, 32-80/2,
32-90/2, 40-50/2, 40-80/2 and 40-90/2 must be
operated minimum once every month in minimum 5
minutes to prevent the shaft seal faces from sticking.
7.4.2 Motor
The motor must be checked at regular intervals. It is
important to keep the motor clean in order to ensure
adequate ventilation. If the pump is installed in a
dusty environment, both pump and motor must be
cleaned and checked regularly.
7.4.3 Lubrication
MG motors
The bearings of motors up to 11 kW are greased for
life and require no lubrication.
The bearings of motors of 11 kW and up must be
greased in accordance with the indications on the
motor nameplate.
Siemens motors
Motors up to and including frame size 250 have
maintenance-free, greased-for-life bearings.
Motors of frame sizes larger than 250 must be
greased according to the indications on the motor
nameplate. Grease spills from the motor may occur.
Other motors
For other motor makes with grease nipples, lubricate
the motor according to the indications on the motor
nameplate.
7.4.4 Bearing grease
The motor must be lubricated with a lithium-based,
high-temperature grease.
• The technical specification of the grease must
correspond to DIN 51825, K3N, or better.
• The viscosity of the basic oil must be higher than
50 cSt (mm
2
/s) at 40 °C (104 °F) and 8 cSt
(mm
2
/s) at 100 °C (212 °F).
• The grease filling rate must be 30-40 %.
7.4.5
Frost protection
Pumps which are not being used during periods of
frost must be drained to avoid damage.
21
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