Operation
4990671000 February 2008
25
6.2.3
Inspection intervals
6.2.4
Operating the liquid ring pump
The volumes of operating water required for proper op-
eration of the liquid ring pump are given in the table be-
low:
Note that the actual operating water requirement var-
ies widely as a function of the operating vacuum / op-
erating pressure.
6.2.5
Operating water consumption and
control
While passing through the liquid ring pump, the con-
veyed medium (air) comes into close contact with the
operating medium (water). This causes the relative hu-
midity of the conveyed medium to be, as a rule, 100%
at the discharge side. Even if all water droplets were
separated in the water storage tank or in a cyclone, the
steam in the exhaust air will always cause a certain
consumption of operating fluid.
The specific water discharge as a function of the oper-
ating pressure and the operating water temperature
can be seen in Fig. 6.1.
It follows that for Aqualine 2100 at 400 mbar operating
pressure and operating water temperature of 40 °C the
water loss due to steam is
1,700 [m
3
/h] x 0.016 [kg/m
3
] = 25.6 kg/h
That is roughly 26 [ltr/h]
In actual pump service, therefore, the following points
should be noted:
•
The loss of water due to steam can cause a rise in
the concentration of pollutants in the operating
water tank, which depends on the conveyed
medium; this again can change the pH of the oper-
ating water.
•
To avoid operating water pH outside the permitted
range of 5 < pH < 8, the pH should be checked
regularly (daily or as dictated by experience) and
the operating water changed in regular intervals.
Litmus paper can be used for pH measurement.
•
Water can condense in long exhaust lines, espe-
cially in cold weather. To prevent the outflow of
condensed operating fluid from the exhaust sys-
tem, the installation of an additional separator
(cyclone) at the end of the exhaust line may be
used.
See chapter
Every 10 –
20 min while
running
Weekly
If necessary
Operating speed
6.2
X
Operating pressure / operating
vacuum
Nameplate
X
Operating water feed temperature
6.2
X
Actuate safety valve
6.2.1
X
Water stop valve
6.2.2
X
Replace contaminated operating
water (e.g. pH, abrasive material)
X
Clean compressor and cooling unit
X
Operating
liquid level:
Inspect the level of the operating liquid before every start and during operation of the
pump.
Bearings:
Inspect the housing, housing covers and end covers for symptoms of overheating, abnor-
mal
noise or colour daily/regularly.
Aqualine
1100
1600
2100
2700
Operating
water volume
at 400 mbar
in [ltr/min]
50 – 70
60 – 80
70 – 90
80 – 90
