13
VM 623.0004 GB/07.00 – Ident–Nr. 550 298
À Hazardous substances are:
S Toxic substances
S Health–endangering substances
S Corrosive substances
S Irritants
S Explosive substances
S Fire–inducing substances
S Highly flammable, easily flammable and normally
flammable substances
S Carcinogenic substances
S Substances impairing fertility
S Genetically distorting substances
S Substances in other ways hazardous to humans
Pumps or units which pump hazardous substances or
substances that are dangerous to the environment
must be completely decontaminated.
7.2.1 Dismounting the screw pump
Before dismounting, the following work must be carried
out:
S The power supply cable must be disconnected from
the motor by an authorized electrician. Electrical
danger must be eliminated! The motor must be
secured against being switched on.
S Close all stop devices in the suction and pressure
pipelines.
S Drain the fluid in flowable condition from the pump.
Note: Use a collecting tank.
S Hazardous substances and/or environmentally
harmful media must be drained off and collected
such that no danger to life and limb is created.
Environmentally compatible disposal must be
ensured.
S The pump must be depressurized and drained.
S Allow the pump and motor to cool to ambient
temperature.
S Remove the manometer cables, manometers and
retaining brackets.
S Remove the contact protection.
S Remove the motor from the base plate or pump
bracket where appropriate.
Note: Use suitable lifting gear.
S Remove immersion pump aggregates from the tank.
S Remove supply/suction and pressure pipelines as
appropriate.
S Loosen the fastening and remove the pump from the
base plate or pump bracket.
Note: Use suitable lifting gear.
The pump must be dismounted by a qualified
technician using the pertaining drawings.
To prevent damage, it is especially important to ensure
that the components are dismounted concentrically
and that they are not tilted.
Dismounting instructions:
S The fitting position of all components must be accu-
rately marked before dismounting.
7.2.2 Mounting the screw pump
Before remounting check all parts for wear
and aging and, as necessary, replace with
original replacement parts.
Clean all parts before mounting. Always fit new
gaskets.
The pump must be mounted by a qualified techni-
cian using the pertaining drawings. The prescribed
tightening torque must be observed.
To prevent damage, it is especially important to ensure
that the components are mounted concentrically and
that they are not tilted.
Mounting instructions:
S The markings applied when dismounting must be
observed. The components must be put back in their
original fitting position.
S After tightening the screws it must be possible to turn
the pump by hand without straining points.
7.2.3 Tightening torque
Note: With poor and lightly greased surfaces, the va-
lues must be increased by 10–15%, in order to reach
the required performance.
Thread Qualtity
Tightening
torque
[Nm]
M 4
M 6
M 8
M 10
M 12
M 16
M 20
M 24
M 27
M 30
5.6
1,1
3,9
9,8
18,6
32,3
78,4
156,8
289,1
426,3
578,2
M 4
M 6
M 8
M 10
M 12
M 16
M 20
M 24
M 27
M 30
8.8
2,5
8,8
21,6
43,1
73,5
181,3
352,8
661,5
975,1
1323,0
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