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Heating Expansion Vessel or Tank Sizing Guide

The Following has been prepared as an aid to correctly size a sealed system Expansion Vessel. If you are not sure which size vessel you require please see the formula at the bottom of this page.

Vessel Size

(Litres)

Static Head

(Metres)

Boiler Rating

(KW)

BTU

Product

5

5

8.90

30,366

520-146-0056
5 Litre Heating Vessel

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10

7.18

22,559

8

5

14.33

45,024

520-146-0080
8 Litre Heating Vessel

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10

11.50

36,133

12

5

21.58

67,804

520-146-0128
12 Litre Heating Vessel

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10

17.25

54,199

18

5

32.50

102,115

520-146-0186
18 Litre Heating Vessel

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10

25.83

81,157

15

19.25

60,483

24

5

43.07

135,321

520-146-0241
24 Litre Heating Vessel

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10

34.48

108,331

15

25.90

81,356

35

5

63.00

197,925

520-146-0352
35 Litre Heating Vessel

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10

50.30

158,020

15

37.50

117,716

50

5

90.16

283,241

520-146-0504
50 Litre Heating Vessel

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10

71.80

225,550

15

53.65

168,350

80

5

143.70

451,505

520-146-0804
80 Litre Heating Vessel

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10

115.00

361,330

15

86.10

270,526

100

5

179.60

564,303

520-146-1008
100 Litre Heating Vessel

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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 of the expansion vessel. It is not the acceptance volume.

C    The total volume of water in the system (Litres).

p1   The fill pressure in Bars absolute (atmospheric or gauge pressure plus 1 Bar).

p2  The setting of the expansion/pressure relief valve in Bars Absolute (atmospheric or gauge pressure plus 1 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

               

 
 
Advanced Water Company
Unit D5 Enterprise Centre
Off Enterprise Way
Vale Park, Evesham
Worcestershire. WR11 1GS

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