Installation | 5
Instruction Manual DOLPHIN LM 0100-0800 A, LT 0130-0750 A_EN_en
13 | 40
5.2.3.3
Total Recovery (Closed Circuit)
1
2
3
4
5
6
Description
1
Process inlet (IN)
2
Gas discharge (OUT)
3
Topping-up operating liquid
4
Cooling water inlet (CWI)
5
Cooling water outlet (CWO)
6
Heat exchange (HE)
Total recirculation liquid system recovers all of the operating liquid which is cooled by a heat ex-
changer.
The recommended maximum pressure drop across the total recirculation system heat exchanger is
150 mbar on the machine side.
This arrangement provides for total recirculation of the operating liquid. A heat exchanger is added
to remove the heat of compression, friction and condensation from the operating liquid before it is
reintroduced back into the machine. For prolonged operation at suction pressure above 300 hPa abs
(300 mbar abs), a circulating pump is recommended. At suction pressure above 400 hPa abs (400
mbar abs) or when suction pressure varies during cycling operations, a circulating pump is manda-
tory.
5.3
Operating Liquid Settings
The condition of both the operating liquid and the conveyed media depend on the physical condi-
tions pressure and temperature.
At a very low pressures and sufficiently high temperatures the operating liquid can locally transfer
into the vapor phase, creating bubbles within the operating liquid. This process is called “cavitation”
and may deteriorate the machine and its performance, see
Recommended operating liquid settings:
Fresh water flow rate
(once through operation only)
m
3
/h
See
Water pressure before flow regulation valve
(once through operation only)
bar
1
Max. allowable supply temperature
°C
80
Max. allowable kinematic viscosity
mm
2
/s
20
Consider the motor power for any-
thing other than water - consult
Busch.
Max. allowable particle size
mm
0.1*
* For all operating systems make sure that no particles with a diameter larger than 0.1mm will intrude the
machine, neither via the process gas nor via the operating liquid. Use suitable filtration as necessary.
