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Typical examples
A:
Twin pipe system with separate pipes for flue gas and air supply
B:
Twin pipe system with separate pipes and concentric roof terminal
C:
Single pipe for flue gas outlet only (air supply from water heater room)
D:
Concentric pipe for flue gas/air supply (roof mounted)
E:
Concentric pipe for flue gas/air supply (wall mounted)
F:
Separate air supply duct & flue duct in different pressure zone
11.12.1 E
A: T
XAMPLE
WGX
155
Note:
The resistance values used are for Lochinvar supplied M&G flue pipe only, flue supplied via third parties will
have different resistance values.
54
WIN PIPE SYSTEM WITH SEPARATE PIPES FOR FLUE OUTLET AND AIR SUPPLY
Calculation example with given lengths: checking resistance.
Water heater type:
Diameter: 150 mm
Straight tube /m
Bend
Flue outlet
Total resistance flue gas outlet:
Diameter: 150 mm
Straight tube /m
Bend
Air inlet
Total resistance air supply:
Total resistance flue gas outlet and air supply:
The total resistance is less than 200 Pa.
This flue gas/ air supply system is functional.
NOTE: specific resistance values are used in this example.
Flue and air pipes of other suppliers can have other values
E93.1804.014
C63
C33
B23
C33
C13
C53
EFW 155
Number
Pa
total
9
1.3
90°
2
4.9
zeta=1.0
1
6.3
Number
Pa
total
8
1.5
90°
2
5.7
zeta=1.0
1
7.3
Pa total
11.7
9.8
6.3
27.8
Pa total
12.0
11.4
7.3
30.7
58.5 Pa
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