TAEevo015÷351
19
MAINTENANCE AND OPERATING MANUAL
Chapter 5 - Installation
The data inside this manual are not binding and they can be modified by the manufacturer without notice.
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TAEevo015÷351
5 . 5
E x p a n s i o n t a n k
If the hydraulic circuit is of closed type, it is necessary to install an expansion tank.
The expansion tank must always be connected at pump inlet.
To calculate the minimum volume of the expansion tank required for a given installation, the formula below cab be used and is valid if the
pressure is less than or equal to 0.5 bar when the pump is stopped and the maximum working pressure of the expansion tank is greater than or
equal to 4 bar.
The volume of the expansion tank V in litres is given by the formula:
V = 2 · Vt · (Ptmin - Ptmax)
where:
Example of calculation:
Vt
=200 litres
percentage of ethylene glycol in volume =30%
tmin =5°C from the table
Ptmin
=(1.045+1.041)/2 = 1.043
tmax =40°C from the table
Ptmax
=1.0282
V=2 · 200 · (1.043 - 1.0282)=5.92 litres
Table of specific weights P
Process water inlet
Process water outlet
When filling the circuit with liquid check to ensure the absence of air bubbles and
contaminants. If the pump runs noisily or emits anomalous noise it may be necessary to
bleed the liquid circuit in order to prime the pump.
The procedure is as follows:
•
unscrew the filler/breather plug at the top of the pump
•
fill the hydraulic circuit until water starts to overflow from the filled hole
•
refit the plug and tighten it
Repeat the operation if the pump continues to run noisily, in such a way as to eliminate
any air that had previously remained trapped in the impeller vanes.
In the event of double pump, keep particular attention during priming the pump. It is
necessary to verify first the pump positioned on the top.
Vt=
total volume of the circuit in litres
Ptmin
=
specific weight at the minimum temperature obtainable by water
over the year in °C (even with the plant stopped)
Ptmax
=
specific weight at the maximum temperature obtainable by water
over the year in °C (even with the plant stopped)
% Glycol
0%
10%
20%
30%
40%
Te
mp
er
at
u
re [
°C
]
-20(-4)
1,0036
1,0195
1,0353
1,0511
1,0669
-10(14)
1,0024
1,0177
1,033
1,0483
1,0635
0(32)
1,0008
1,0155
1,0303
1,045
1,0598
10(50)
0,9988
1,013
1,0272
1,0414
1,0556
20(68)
0,9964
1,0101
1,0237
1,0374
1,051
30(86)
0,9936
1,0067
1,0199
1,033
1,0461
40(104)
0,9905
1,003
1,0156
1,0282
1,0408
Table 8
S
PECIFIC
WEIGHTS
PLUG
