35
8.8.6
E
XAMPLE
D1:
T
WIN PIPE SYSTEM WITH CONCENTRIC ROOF TERMINAL
.
Boiler type:
S-CB
+
550
Flue
gas
Diameter: 200 mm.
Number
Pa
Pa total
Straight tube m¹
total
4
3,0
12,0
Bend
90°
1
11,6
11,6
Adapter eccentric
1
1,7
1,7
Condensate trap
1
6,6
6,6
Conc. roof terminal 200-300 M&G
1
106,6
106,6
Total resistance flue gas outlet:
138,5
A
ir
su
pp
ly
Diameter: 200 mm.
Number
Pa
Pa total
Straight tube m¹
total
2.5
2,1
5,3
Bend
90°
2
8,7
17,4
Adapter 180-200
1
7,6
7,6
Conc. roof terminal 200-300 M&G
1
54,0
54,0
Total resistance air supply:
84,3
Total resistance flue gas outlet and air supply:
222,8
The total resistance is less than 250 Pa, so this is acceptable.
(The maximum allowed pressure is increased to 250 Pa when using a concentric roof terminal).
1.0 m
3
.0
m
2
.5
m
2
2
6
0
7
0
0
4
8
0
Excentric adapter 180>200 mm
Excentric so there is no water
agglomeration.
Besides using a 160>180
mm adapter use also an
180>200 mm adapter.
INLET AIR MUST BE CLEAN
AND FREE OF WATER.
ALWAYS USE A WIRE MESH
TO PREVENT DEBRIS
BEING DRAWN INTO THE
AIR INLET.
The example calculation is
only valid using the
concentric roof terminal.
