42 | 180R9264 | AQ115586503043en-000903
© Danfoss | 2023.03
Operating guide
Installation, Operation and Maintenance APP 11-13
5. Operation
In case of lower operating temperatures, please
contact the Danfoss High Pressure Pumps.
5.1 Temperature
316L
Super Duplex
80 º
C
70
60
50
40
30
20
100
160
1600
1000
16000
10 000
160000
100 000
CI -
ppm
NaCI
ppm
Duplex
5.2 Pressure
The inlet pressure for APP 11-13 and APP 16-22
must be min. 2 barg (29 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 should
be limited at 80 barg (1160 psig) continuously.
NB: The pump unit should include a pressure
gauge on the high-pressure side.
5.3 Dry running
When running, the pump must always be
connected to the water supply in order to avoid
damage if it should run dry.
5.4 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 pro cedure
described under section 4: Initial start up.
5.5 Storage
When preparing the pump for long-term storage
or for temperatures below the freezing point,
flush the pump with an anti-freeze medium type
monopropylene glycol to prevent internal
corrosion or frost in the pump.
For further information on anti-freeze media,
please contact Danfoss High Pressure Pumps.
5.5.1 Recommended procedure
1.
Disconnect the water supply to the pump.
2.
Through the lower bleeding plug, empty
the pump housing of water and close it
again.
3.
Connect the pump to a tank containing
anti-freeze additive. Connect a hose to the
inlet port of the pump and via another hose
return the flow from the outlet port to the
tank with anti-freeze additives.
4.
Quickly start and stop the pump.
Make
sure that the pump does not run dry.
The pump is now protected against internal
corrosion and frost.
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)
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 minimise the risk of crevice corrosion.
Storage temperature:
Min. -40°C to max. +70°C
(Min. -40°F to max. +158°F)
Instruction
