The classification of metal chimneys according to operational parameters
Chimneys shall be classified in accordance with the following performance characteristics:
- Temperature;
- Pressure;
- Condensate resistance;
- Corrosion resistance;
- Sootfire resistance and distance to combustibles.
Temperature clases for chimneys
|
Temperature class |
T080 |
T100 |
T120 |
T140 |
T160 |
T200 |
T250 |
T300 |
T400 |
T450 |
T600 |
|
Nominal working temperature, ºC |
≤080 |
≤100 |
≤120 |
≤140 |
≤160 |
≤200 |
≤250 |
≤300 |
≤400 |
≤450 |
≤600 |
|
Flue gas test temperature, ºC |
100 |
120 |
150 |
170 |
190 |
250 |
300 |
350 |
500 |
550 |
700 |
Pressure classes
|
Pressure type |
Test pressure, |
Leakage rate/Flue surface area, |
|---|---|---|
|
N1 (negative pressure) |
40 |
<2,0 |
|
N2 (negative pressure) |
20 |
<3,0 |
|
P1 (positive pressure) |
200 |
<0,006 |
|
P2 (positive pressure) |
200 |
<0,120 |
|
H1 (high positive pressure) |
5000 |
<0,006 |
|
H2 (high positive pressure) |
5000 |
<0,120 |
Condensate resistance classes
W - for chimneys operating under wet conditions;
D - for chimneys operating under dry conditions.
Corrosion resistance classes
Durability against corrosion shall be declared either on the basis of:
- material type and thickness of the flue liner; or
- on the basis of the results of at least one of the three test methods described in standard EN 1856-1.
Sootfire resistance classes
O - for chimneys without sootfire resistance;
G - for chimneys with sootfire resistance.