Description of the pump
en
Additional instructions Wilo-Crono... IL/DL/BL... ATEX, Wilo-Vero... IPL-N/DPL-N... ATEX
23
Pumps and mechanical seals must be additionally protected against dry
running. This applies especially to pumps in the Wilo-VeroLine-IPL-N and
Wilo-VeroTwin-DPL-N series. There is a danger of electrostatic charging
to the plastic impeller if the impeller is not surrounded by fluid.
Protection against dry running can either be provided by monitoring the
differential pressure or monitoring the flow rate. Furthermore, monitoring
of the pump's power consumption is possible.
All measures must correspond to an ignition protection system of Type b1
in accordance with ISO 80079-37. (See chapters "Dry-running protection"
and "Notes on operation").
The pump may not be operated against closed valves, flow restrictors,
slide valves or other shut-off devices in the fluid circulation.
5.2
Authorised operating conditions
5.2.1
For series IPL-N/DPL-N
Fluid
Mechanical seal
Limitation of maximum permissible
fluid temperature
Number of
motor
poles
T4
p = 10 bar
T3
p = 10 bar
Heating water in ac-
cordance with VDI 2035
Standard (AQ1EGG) 2
4
120 °C
120 °C
120 °C
120 °C
Semi-desalinated water
with conductivity
> 80 μs,
silicates < 10 mg/l, pH
value > 9
Standard (AQ1EGG) 2
4
120 °C
120 °C
120 °C
120 °C
Mineral oil
With fluorine-rub-
ber secondary seal,
e.g. Viton
(AQ1VGG)
2
4
105 °C
115 °C
120 °C
120 °C
Heating water with con-
ductivity < 850 µs,
silicates < 10 mg/l, solid
matter content < 10 mg/
l
Standard (AQ1EGG) 2
4
120 °C
120 °C
120 °C
120 °C
Condensate
Standard (AQ1EGG) 2
4
100 °C
100 °C
100 °C
100 °C
Cooling brine, inorganic;
pH value > 7.5, inhibited
Standard (AQ1EGG) 2 and 4
30 °C
30 °C
Water with oil contam-
ination
With fluorine-rub-
ber secondary seal,
e.g. Viton
(AQ1VGG)
2 and 4
90 °C
90 °C
Cooling water with frost
protection (pH value
7.5 – 10; no galvanised
components)
Standard (AQ1EGG) 2 and 4
40 °C
40 °C
Water-glycol mixture
(20 % – 40 % glycol)
Standard (AQ1EGG) 2 and 4
40 °C
40 °C
Table 2:
Authorised operating conditions for the IPL-N/DPL-N series
5.2.2
For series IL/DL/BL
Fluid
Mechanical
seal
Limitation of maximum permissible fluid
temperature
Num-
ber of
motor
poles
T4
p
= 10 b
ar
T4
p
= 16 b
ar
T3
p
= 10 b
ar
T3
p
= 16 b
ar
Heating water in ac-
cordance with VDI 2035
Standard
(AQ1EGG)
2
4
100 °C
115 °C
90 °C
110 °C
140 °C
140 °C
120 °C
120 °C
