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It must not be possible to touch rotating or reciprocat-
ing machine parts accidentally.
The surface temperature must not exceed 80°C.
4.6.8
Bellows
To limit the connection forces in the suction and pres-
sure line of the liquid ring pump, vacuum-tight and
pressure-tight bellows (Fig. 4.1/5 and 4.2/5) must be
installed.
At the same time, the bellows cause separation of the
solid-borne noise of the suction and pressure lines.
4.6.9
Speed monitor
Speed control of the liquid ring pump and a speed in-
dicator in the operating area of the machine are recom-
mended. For permitted speed range, see chapter 1.1
"Machine data".
4.7
Operating fluid
For start-up, the liquid ring pump requires an amount
of water sufficient to form the liquid ring.
Therefore, when installing the pump, make certain that
the water tank is located so that when the operating
water feed valve is open and the tank contains a mini-
mum of water, the liquid ring pump fills with water up to
the middle (also see Operating Instructions). If this is
not ensured there may be problems in starting the
pump (no conveyed medium flow).
If the water tank is located so that the liquid level is
above the middle of the liquid ring pump, an automatic
water stop valve (Fig. 4.1/14 and 4.2/14) must be in-
stalled in the operating water supply line. This valve
must open when the pump starts and close when it is
stopped to prevent inundation of the pump.
If the liquid ring pump is installed above the water level
in the tank, a pump is required to ensure the operating
water supply. The design of that pump must be such
that the liquid ring pump is supplied with sufficient op-
erating fluid. We will be glad to assist you in selecting
the right pump.
Because liquid is removed from the working space and
also because heat must be dissipated, the liquid ring
pump requires a constant supply of operating fluid. For
this, the casing cover of the machine have a connec-
tion (see dimension sheet).
If the piping has sufficiently low resistance (depending
on pipeline length and layout) no re-circulation pump
may be needed for the operating water supply provid-
ed the arrangement of the liquid ring pump is such that
T-EA-5100-1-GB-07-08
the middle of the pump is at a lower level than the min-
imum liquid level in the storage tank.
A level control of the operating liquid must be
provided if the machine is operating in a poten-
tially explosive atmosphere.
4.7.1
Operating water back-cooling and
storage tank
A circulation cooling system is required for back-cool-
ing the operating water. The circulation cooling must
be able to handle the following amounts of heat.
To reduce the loss of liquid by the exhaust air to a min-
imum and also to ensure a sufficient number of operat-
ing hours of the system, a combined operating water
storage and separating tank (Fig. 4.1/9 and 4.2/9) is
needed. For minimum sizes, refer to the table below.
Aqualine 1200
Amount of heat to be
dissipated
at 1.5 bar
(g)
at 0.5 bar
(g)
at 400 mbar
at 200 mbar
Recommended pipe
diameter operating
water line
Recommended mini-
mum tank size
Recommended water
volume in the tank
The above minimum water storage figures relate to
systems with water back-cooling.
Systems without water back-cooling require substan-
tially larger storage tanks to ensure sufficient operating
hours of the liquid ring pump without running the risk
that the recommended limit temperature of 55 °C the
operating water inflow is exceeded.
Suction dramatically reduces at higher temperatures.
4.7.2
Cell Ventilation
The cell ventilation is required to ensure the proper op-
eration of the liquid ring pump at low intake pressure
down to total residual pressure. The ventilation line is
connected housing covers (see figure 1.1 'Dimensions
of Aqualine 1200" ).
21
Installation
at 1000
at 1500
-1
-1
min
min
kW
26
48
kW
11
23
kW
15
30
kW
16
35
1
R1
/
"
2
250
ltr
150
ltr
at 1800
-1
min
72
35
45
52
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