Temperature; Pressure; Dry Running; Disconnection - Danfoss APP series User Manual

Instruction
5. Operation
24
APP pump instruction APP 11-13 and APP 16-22
5.1

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 the Danfoss RO Solutions Sales Organisa-
tion.
80 º
C
70
60
50
316L
40
30
20
100
160

5.2 Pressure

The inlet pressure for APP 11-13 and APP 16-22
must be min. 2 bar (29 psi) and max. 5 bar
(72,5 psi).
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 bar (145 psi) are
acceptable.
Max. pressure on the pump's outlet line should
be limited at 80 bar (1,160 psi) 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.
180R9265 / IOM APP 16-22 Appendices - v02 / 01.2013
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.
Duplex
Super Duplex
1000 10 000
1600 16000
5.5 Storage
Storage temperature:
Min. -40°C to max. +70°C
(Min. -40°F to max. +158°F)
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 the Danfoss RO Solutions Sales
Organisation.
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.
CI -
100 000
ppm
NaCI
160000
ppm