20037075
14
GB
Technical description of the burner
3.8.1
Procedure to refer burner operating condition
in high altitude plants
Find the CORRECTED BURNER CAPACITY for the plant’s alti-
tude in chart 1 and the CORRECTED PRESSURE in chart 2.
Check in the firing rate graph of the burner (Fig. 5 and Fig. 6), if the
working point defined by the values above is within the range limits.
If not, higher burner size is needed.
Note
➤
Charts are based only on altitude variation (reference temper-
ature = 68°F, 20°C)
➤
To get the combined correction in case of different air temper-
ature, a compensation of 1000 ft each 20°F (305 m each
11°C) is applicable (100 ft = 2°F).
Example
Rated capacity
= 3000 MBtu/hr - Rated air pressure = 1.5” WC
Real altitude
= 5000 ft - Real temperature = 108°F
∆
= 108°F - 68°F (reference temp.) = 40°F
(equivalent 2000 ft variation)
40 : 2 = 20 x 100 = 2000 ft
Proceeding as descripted above and considering a “virtual altitude”
of (5000 + 2000) ft:
–
3000 MBtu/hr at 7000 ft, the corrected capacity is 3847 MBtu/hr
–
1.5” WC at 7000 ft, the corrected burner air pressure is 1.92
Reference conditions:
–
Ambient temperature 68 °F (20 °C)
–
Barometric pressure 394” WC (1000 mbar)
–
Altitude 328 ft a.s.l. (100 m a.s.l.).
0
2
4
6
8
10
12
14
16
18
m
ba
r
9
8
7
6
5
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2
0
1
w
.c
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0
5600
5200
4800
4400
4000
3600
3200
2800
2400
2000
1600
1200
800
400
0
6000
9200
8800
8400
8000
7600
7200
6800
6400
MBtu/h
kW
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
22000
24000
26000
28000
30000
20
22
24
26
10
Fig. 6
Power output
D11425
Firing rate for C-ETL Canadian Listing
C
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c
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RS 650/EV FGR
RS 800/EV FGR
Summary of Contents for RS 300/EV FGR
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