4
3. Safety and accident prevention
3.1 General suggestions
- Ordinary and extraordinary maintenance has to be done while
the unit is stopped and the drive disconnected.
- Never start the pump if adequate foreseen safety devices are not
installed. Damaged protections must be immediately replaced.
3.2 Normal use
- The VL pumps are intended for transfering viscous and fibrous
products, slurries, sludges, pastes and muds also containing
abrasive and suspended solids with a maximum diameter of 30
mm and can give a pressure ranging from a max of 5 bar
(standard execution) to 10 bar (requested execution).
- VL pumps are self-priming and at the starting-phase can run ‘dry’
for a short time. However dry-run has never to exceed 2 minutes
in order to prevent over-heating and/or damages to the lobes.
Pay attention to the
prescribed work-r.p.m. for
the pump
4. Installation
4.1 Checking at arrival
- Upon receipt check that the pump and related accessories are
not damaged.
4.2 Pump installation / Drive connection
- The pump must be installed so that it is easily accessible for
inspection and maintenance.
- The pump can be installed both horizontally or vertically (see
Fig. 1).
- Drive to the pump can be by means of cardan shaft or hydraulic
motor. The cardan shaft must be mounted so that it does not
create any axial thrusts; the inclination of the shaft must not
exceed 15 degrees (see Fig. 2).
The transmission must be protected
according to current safety standards (for
Europe No.
2006
/
4
2 CEE standards).
15
°
Fig. 2
- With the hydraulic transmission the motor must be mounted by
means of a support and a flexible joint.
- By first trial run and/or for a long standing spann of time it is
suggested to put a layer of lubricating grease inside the pump.
Flanges must be perfectly parallel
Vacuum pump axle
Transmission drive
It must be absolutely avoided that solids of large
dimentions are sucked inside the pump because
this could cause damages to the unit and/or the
drive. This can be achieved by fitting a suitable
filter to the suction pipe inlet.
With cardan drive a cardan shaft with safety pin
is suggested.