Pumped Liquids; Technical Data; Ambient Temperature; Liquid Temperature - Grundfos DNP series Montage- Und Betriebsanleitung

3.1 Pumped Liquids

Thin, clean, non-aggressive and non-explosive liquids, not con-
taining solid particles or fibres. The liquid must not attack the
pump materials chemically.
When pumping liquids with a density and/or viscosity higher than
that of water, motors with correspondingly higher outputs must be
used, if required.
The O-rings and the mechanical shaft seal chosen must be suit-
able for the liquid to be pumped.
Special shaft seals may be required if the pump is used for pump-
ing treated water at temperatures above 80°C containing addi-
tives to prevent system corrosion, calcareous deposits, etc., e.g.
in heating and ventilating systems.
When pumping water/glycol mixtures, it may be necessary to use
another shaft seal.
For further information, please contact GRUNDFOS.

4. Technical Data

4.1 Ambient Temperature

Maximum +40°C.

4.2 Liquid Temperature

–15°C to +140°C.
The maximum liquid temperature marked on the pump nameplate
depends on the mechanical shaft seal used.
The pump housing is made of cast iron GG 25. Please note that
the maximum permissible liquid temperature may be limited to
+120°C by local regulations.

4.3 Operating Pressure

Up to +100°C: Maximum 1.6 MPa (16 bar).
At +140°C: Maximum 1.0 MPa (10 bar).
The maximum operating pressure depends on the liquid tempera-
ture.
The pressure and temperature limits indicated in fig. 2 must not
be exceeded.
Fig. 2
P
(bar)
16
14
12
10
8
6
4
2
0
-15 0 20 40

4.4 Minimum Inlet Pressure

According to the NPSH curve (see page 87) + a safety margin of
minimum 0.5 metres head.
Calculation of minimum inlet pressure is described in section 12.

4.5 Maximum Inlet Pressure

The actual inlet pressure + pressure when the pump is running
against a closed valve must always be lower than the maximum
permissible operating pressure.

4.6 Minimum Flow Rate

A minimum flow rate equal to 10% of the flow rate at maximum ef-
ficiency is needed at all times. Flow rate and head at maximum
efficiency are stated on the pump nameplate.

4.7 Maximum Flow Rate

The maximum flow rate must not exceed the values stated for
each individual pump on page 86, as otherwise for instance cavi-
tation and overload may occur.
60 80 100 120 140 °C

4.8 Electrical Data

See motor nameplate.

4.9 Dimensions and Weights

Dimensions: See pages 84 and 85.
Weights: See label on the packing.

4.10 Sound Level

See table on page 83.

5. Installation

5.1 Pump Location

The pump should be sited in a dry, well ventilated, but frost-free
position.
When pumping hot liquids, care should be taken to
ensure that persons cannot accidentally come into
contact with hot surfaces.
For inspection and motor/pump head removal, sufficient clear-
ances must be allowed in accordance with the following guide-
lines:
Vertical installation:
• Pumps fitted with motors up to and including 4 kW require a
300 mm clearance above the motor, fig. 3.
• Pumps fitted with motors of 5.5 kW and larger require at least
a 1 metre clearance above the motor to allow the use of lifting
equipment, if required, fig. 3.
Fig. 3
0.25 - 4 kW
300 mm
Horizontal installation:
• Pumps fitted with motors up to and including 4 kW require a
300 mm clearance behind the motor, fig. 4.
• Pumps fitted with motors of 5.5 kW and larger require a
300 mm clearance behind the motor and at least a 1 metre
clearance above the motor to allow the use of lifting equip-
ment, if required, fig. 4.
Fig. 4
0.25 - 4 kW
5.5 - 30 kW
1 m
The lifting eyes of pump motors of 4 kW and larger can be used
for lifting the pump head (motor, motor stool and impeller). The
lifting eyes must not be used for lifting the entire pump.
5.5 - 30 kW
1 m
300 mm
300 mm
69