The following guide has been prepared as an aid to correctly size a sealed heating system expansion vessel, for further information please contact the Reliance Technical Dept. on +44 (0)1386 712400.
|
Vessel Size (litres) |
Static Head (meters) |
Boiler Rating kW |
BTU |
|
5 |
5 |
8.90 |
30,366 |
|
|
10 |
7.18 |
22,559 |
|
8 |
5 |
14.33 |
45,024 |
|
|
10 |
11.50 |
36,133 |
|
12 |
5 |
21.58 |
67,804 |
|
|
10 |
17.25 |
54,199 |
|
18 |
5 |
32.50 |
102,115 |
|
|
10 |
25.83 |
81,157 |
|
|
15 |
19.25 |
60,483 |
|
25 |
5 |
44.83 |
140,855 |
|
|
10 |
35.92 |
112,860 |
|
|
15 |
27.00 |
84,834 |
|
40 |
5 |
71.80 |
225,595 |
|
|
10 |
57.50 |
180,665 |
|
|
15 |
43.00 |
135,106 |
|
60 |
5 |
107.76 |
338,581 |
|
|
10 |
86.20 |
270,840 |
|
|
15 |
64.65 |
203,130 |
|
80 |
5 |
143.70 |
451,505 |
|
|
10 |
115.00 |
361,330 |
|
|
15 |
86.10 |
270,526 |
|
100 |
5 |
179.60 |
564,303 |
|
10 |
143.70 |
541,505 |
|
15 |
107.70 |
338,393 |
If the system volume is known, expansion vessels can be sized with the formula:
V= eC
1 – p1
p2
V The total volume or nominal size of the expansion vessel. It is not the acceptance volume. (See product description).
C The total volume of water in the system (litres)
P1 The fill pressure of the system in Bars absolute (atmospheric or gauge pressure plus one Bar).
P2 The setting of the expansion/pressure relief valve in Bars absolute atmospheric or gauge pressure plus one Bar).
e The expansion factor that relates to the maximum system requirements.
Expansion factor ‘e’ Temperature °C
0.0324 85
0.0359 90
0.0396 95
0.0434 100
|
