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en – Original instructions
e-IXPS - Installation, Operation and Maintenance Instructions
23
WARNING: Danger of hot and/or toxic liquid spillage due to the on-off valve being closed
It is prohibited to operate the unit with the on-off valves on the suction and discharge sides
closed. If the unit needs to operate for more than a few seconds with the discharge valve
closed, or below the minimum flow rate, install a bypass circuit.
WARNING:
It is prohibited to place flammable materials near the unit.
NOTE:
Check that the shaft can turn smoothly.
NOTE:
The unit must be filled and vented properly before it can be started.
NOTE:
It is prohibited to operate the unit when dry, not primed and below the rated flow rate.
NOTE:
The maximum pressure delivered by the unit at the discharge side, determined by the
pressure available on the suction side, must not exceed the maximum pressure (PN).
5.2
Intended use
Speed, pressure, temperature
The speed, pressure and temperature of the pump and the shaft sealing should not exceed
the limit values given in the data sheet and/or order confirmation.
As they can occur with too fast shut down, keep them under control for example by installing a
non-return valve on the pressure side, fly wheel or air tanks.
They can cause temperature shock and damage or impair the operation of single components.
Permitted Nozzle loads and Torques
The suction and discharge piping must be designed in such way that as little force as possible
is required for pump operation. If this is not possible, the values shown in Section 4.3.3 must
not be exceeded under any circumstances. This applies both when the pump is in operation
and when idle, and therefore for all the possible pressures and temperatures of the unit.
NPSH
The pumped liquid must have a minimum pressure NPSH at the impeller inlet, to ensure
cavitation free operation and prevent pump break off.
When the NPSH-value of the system (NPSHA) lies above the NPSH-value of the pump (NPSHR)
under all operating conditions, this requirement is fulfilled.
NOTE:
Increase in temperature due to contact between rotating and fixed components. Do not
operate with the valves closed at the suction and/or discharge pipe.
The curves of every pump type show the NPSH-value of the pump (NPSHR).