19
Pr
essur
es and w
at
er intak
e
Pre c
harge pressure of empty tank = static height in mwc (metres w
ater column) + 0.5 bar
Operating pressure = system fill (cold = tm max. 45°C) = pre c
harge pr 0,2 bar
The values gi
ven in the table are the number of litres until whic
h a pressure of 3.0 bar is reac
hed.
W
ater intak
e in litres / 6 bar safety valve
The capacities of other br
ands ma
y dif
fer fr
om those in this table (Pneumat
ex expansion v
essels)!
Pre c
harge pressure in tank
(bar)
1
1.
1
1.
2
1.
3
1.
4
1.
5
1.
6
1.
7
1.
8
1.
9
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Static height (mwc)
≤ 5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SD = w
all-mounted tanks
SD 8
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.
8
1.
6
1.
4
1.
2
1.
0
0.8
0.6
0.4
0.2
SD 1
2
6.0
5.6
5.4
5.0
4.8
4.4
4.2
3.8
3.6
3.2
3.0
2.6
2.4
2.0
1.
8
1.
4
1.
2
0.9
0.6
0.3
SD 1
8
9.0
8.5
8.1
7.
6
7.
2
6.7
6.3
5.8
5.4
4.9
4.5
4.0
3.6
3.1
2.7
2.2
1.
8
1.
4
0.9
0.5
SD 25
12.5
11
.8
11
.3
10.5
10.0
9.3
8.8
8.0
7.
5
6.8
6.3
5.5
5.0
4.3
3.8
3.0
2.5
1.
9
1.
3
0.6
SD 35
17.
5
16.5
15.8
14.7
14.0
13.0
12.3
11
.2
10.5
9.5
8.8
7.
7
7.
0
6.0
5.3
4.2
3.5
2.6
1.
8
0.9
SD 50
25.0
23.5
22.5
21
.0
20.0
18.5
17.
5
16.0
15.0
13.5
12.5
11
.0
10.0
8.5
7.
5
6.0
5.0
3.8
2.5
1.
3
SD 80
40.0
37
.6
36.0
33.6
32.0
29.6
28.0
25.6
24.0
21
.6
20.0
17.
6
16.0
13.6
12.0
9.6
8.0
6.0
4.0
2.0
SU = standing tanks
SU 1
40
70.0
65.8
63.0
58.8
56.0
51
.8
49.0
44.8
42.0
37
.8
35.0
30.8
28.0
23.8
21
.0
16.8
14.0
10.5
7.
0
3.5
SU 20
0
10
0.0
94.0
90.0
84.0
80.0
74.0
70.0
64.0
60.0
54.0
50.0
44.0
40.0
34.0
30.0
24.0
20.0
15.0
10.0
5.0
SU 30
0
150.0
141
.0
135.0
126.0
120.0
111
.0
105.0
96.0
90.0
81
.0
75.0
66.0
60.0
51
.0
45.0
36.0
30.0
22.5
15.0
7.
5
SU 40
0
20
0.0
188.0
180.0
168.0
160.0
148.0
140.0
128.0
120.0
108.0
10
0.0
88.0
80.0
68.0
60.0
48.0
40.0
30.0
20.0
10.0
SU 50
0
250.0
235.0
225.0
21
0.0
20
0.0
185.0
175.0
160.0
150.0
135.0
125.0
11
0.0
10
0.0
85.0
75.0
60.0
50.0
37
.5
25.0
12.5
SU 60
0
30
0.0
282.0
270.0
252.0
240.0
222.0
21
0.0
192.0
180.0
162.0
150.0
132.0
120.0
102.0
90.0
72.0
60.0
45.0
30.0
15.0
SU 80
0
40
0.0
37
6.0
360.0
336.0
320.0
296.0
280.0
256.0
240.0
21
6.0
20
0.0
17
6.0
160.0
136.0
120.0
96.0
80.0
60.0
40.0
20.0
Example 1: selecting the cor
rect tank v
olume
A system with a static height of 9.0mwc (metres w
ater column) and a w
ater expansion v
olume of 1
2 litres = SD 35.
Example 2: set
ting the cor
rect pressures (pre c
harge pressure and system operating pressure)
A system with a static height of 9.0mwc
=> 1
.4 bar pr
e c
har
ge pr
essur
e => 1
.6 bar syst
em oper
ating pr
essur
e when syst
em is cold.
