4LPPT70EN - 5/2023
6
The safety aspects have been considered as much as possible
in the design of the pump.
Never use the pump with the front cover or inspection glass
open. If the glass must be removed for certain maintenance
procedures, apply extreme caution. Keep all body parts away
from the danger zone.
The pump has been connected to high voltage. The
connection box must not be opened when the drive unit
is connected. Electrical work must be carried out by
professional electricians.
The pump can produce and maintain high pressure. This
must be noted when someone opens the pipe connections
etc. The pipeline can contain high pressure even after the
pump has stopped. Unauthorised personnel are not allowed
near the pump when it is in operation. The maintenance and
servicing of the pump must be carried out by persons with
appropriate training.
Pumps must always be equipped with the safety equipment
required by national regulations as appropriate to the place of
use. Regardless of national regulations, the pump unit power
supply must be equipped with at least the following electrical
safety devices:
• emergency switch
• main switch
• motor overload protector
• fuses
WARNING!
The front cover is part of the pump’s safety equipment.
Never use the pump without the front cover or with the
front cover open.
The following optional equipment is also considered safety
equipment:
• hose leak detector: stops the pump if the hose breaks
• pressure transmitter with display and overpressure limit:
stops the pump if the overpressure limit is exceeded
2 INTRODUCTION
2.1 Applications and purposes of use
LPP-T pumps are intended for pumping liquids, liquids
containing solid matter, sludge, and aggressive liquids.
Normal pumping operations include transfer, dosing, feeding,
and drainage pumping. Use for other purposes is forbidden.
The LPP-T peristaltic hose pump is restarting and gasketless.
The gasketless pump is not damaged even if it runs dry
for a relatively long time. The only part of the pump that
is in contact with the pumped medium is the hose. The
hose is also the only part of the pump that requires regular
replacement.
WARNING!
Using the pump for any purpose other than pumping is
strictly forbidden. Pump is not a safety device.
The protection class (IP) of the pump depends on the level
of equipment installed. The normal protection class for the
motor is IP54.
Restrictions on use for LPP-T pumps
The following restrictions on use must be taken into
consideration:
• LPP-T pumps operate on the displacement principle,
producing a fixed displacement flow for the pumping
cycle. In some applications this might cause overpressure
situations that may lead to equipment damage.
• The operation of the pump is peristaltic. The
displacement flow produced by the pump is not
continuous – there is a phase in each work cycle during
which the displacement flow is zero.
• Thus the displacement flow produced by the pump is
pulsatory, which is manifested in the piping as pressure
pulsation. The pulsation can be dampened by using
flexible piping parts or pulsation absorbers. Pulsation
may be harmful for piping or other equipment connected
to the piping.
Large particles in the medium may harm or cause
puncturing of the pump hose. The maximum particle
size for the pump is 1/4 of the diameter of the hose in
use, depending on the properties of the medium and the
shape of the particles.
• Certain chemicals (especially chemicals at high
temperature) cannot be pumped, or they may
significantly shorten the operating life of the hose