4LPPT70EN - 5/2023
16
• If there are closing valves on the discharge side of the
pump, a pressure relief valve that prevents overpressure
must be installed between the valve and the pump.
The discharge and suction connections of the pump consist of
standard-compliant flange connection surfaces. Their boring
is customer-specific. The lengths of the bolts required for the
flange connection are given in Table 4 below.
Table 4.
Fastening bolt lengths.
Model
Length of fastening bolt (mm)
LPP-T32, T40, T50, T65 & T80
(LPP-T 1.25, T 1.5, T 2, T 2.5 & T 3)
30 mm (1.18 in) + thickness of
customer flange
and gasket
5 PUMP OPERATION
5.1 Commissioning
The LPP-T pumps are normally delivered with pre-installed
hose and lubricant. Also the drive unit (gearbox and motor)
is installed prior to the delivery of the pump. In this case,
the pump is ready to be used with the nominal parameters
indicated on the pump’s type plate. Install the motor in
accordance with the manufacturer’s instructions if the pump
is delivered without it (pump head delivery).
Pumps, size LPP-T50 (LPP-T 2) or bigger, delivered without
frequency inverter need a soft starter to avoid coupling
failures. This needs to be provided by the customer.
Before starting the pump, ensure that it has been installed
in accordance with these instructions and applicable safety
regulations.
At least the following must be ensured:
• The pump is used only for the purpose specified at the
time of sale.
• The hose installed is compatible with the pumped
medium.
• The parameters on the type plate are suitable for the
process values required of the pump. The piping that the
pump is connected to has sufficient ability to withstand
pressure.
• The required pressure relief valves have been connected
and work correctly.
• Electrical work has been carried out by an authorised
electrician.
• Starting the pump does not put personnel or equipment
in danger.
• The pump is correctly connected to the piping and all
connections are pressure-proof.
• The valves of all suction and pressure lines connected to
the pump are open.
• The pump settings are correct.
• The amount of hose lubricant is sufficient.
• If the pump is equipped with a frequency inverter,
the minimum frequency set is sufficient to ensure the
cooling of the pump in all conditions. If the required
minimum frequency is below 20 Hz, the pump must
always be equipped with an additional cooling fan.
