Operation; Temperature; Pressure; Dry Running - Danfoss APP Series Installation, Operation And Maintenance Manual

Operation guide
6.

Operation

52 | 180R9346 | AQ240486503020en-001702
Installation, Operation and Maintenance APP 53-92 pumps

6.1 Temperature

Fluid temperature:
Min. +2°C to max. +50°C
(Min. +35.6°F to max. +122°F)
Ambient temperature:
Min. +2°C to max. +50°C
(Min. +35.6°F to max. +122°F)
In case of lower operating temperatures, please
contact Danfoss High Pressure Pumps.
NaCl vs. temperature
80 º
C
70
60
50
316L
40
30
20
100
160

6.2 Pressure

The inlet pressure shall be min. 2 barg (30 psig)
and max. 5 barg (72.5 psig). At lower pressures
the pump will cavitate, resulting in damage of
the pump.
Max. inlet pressure peak (e.g. in case the pump
stops momentarily) up to 10 barg (145 psig) are
acceptable.
Max. pressure on the pump's outlet line shall be
limited at 80 barg (1160 psig) continuously.
For APP 86 min. inlet pressure shall be 2.5 barg
(36 psig) and max. outlet pressure shall be
70 barg (1015 psig).
For APP 92 min. inlet pressure shall be 3.5 barg
(50 psig) and max. outlet pressure shall be
70 barg (1015 psig).
Note: The pump unit should include a pressure
gauge on the high-pressure side.
The chart below illustrates the corrosive
resistance of different types of stainless steel
related to NaCl concentration and temperature.
The APP water pump is made of Duplex and
Super Duplex.
If the water pump is operated above the Super
Duplex line, always flush water pump with fresh
water at operation stop in order to minimize the
risk of crevice corrosion.
Duplex
Super Duplex
1000 10 000
1600 16000

6.3 Dry running

When running, the pump must always be
connected to the water supply in order to avoid
damage if it should run dry.

6.4 Disconnection

If the inlet line is disconnected from the water
supply, the pump will be emptied of water
through the disconnected inlet line.
When starting up again, follow the bleeding
procedure described under section 4: Initial
start up.
CI -
100 000
ppm
NaCI
160000
ppm
© Danfoss | 2023.03