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3.6.1
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. 3), 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).
1
CORRECTED BURNER CAPACITY ACCORDING TO ALTITUDE
Rated Capacity
m a.s.l.
MBtu/hr
ft a.s.l
1200
1733
2267
2800
3333
3867
4400
4933
5467
6000
Average barometric
mbar
pressure (20°C)
Average barometric
"wc
pressure (68°F)
2
CORRECTED BURNER AIR PRESSURE ACCORDING TO ALTITUDE
m a.s.l.
Rated Pressure
"wc
ft a.s.l
0
0.56
1.11
1.67
2.22
2.78
3.33
3.89
4.44
5
Average barometric
mbar
pressure (20°C)
Average barometric
"wc
pressure (68°F)
Technical description of the burner
0
100
305
0
328
1000
1195
1200
1211
1728
1733
1744
2262
2267
2278
2795
2800
2811
3328
3333
3344
3862
3867
3878
4395
4400
4411
4928
4933
4944
5462
5467
5478
5995
6000
6011
1013
1000
977.4
399
394
385
0
100
305
0
328
1000
-0.11
0
0.23
0.45
0.56
0.79
1
1.11
1.34
1.56
1.67
1.9
2.11
2.22
2.45
2.67
2.78
3.01
3.22
3.33
3.56
3.78
3.89
4.12
4.33
4.44
4.67
4.89
5
5.23
1013
1000
977.4
399
394
385
9
Example
Rated capacity = 4400 MBtu/hr - Rated air pressure = 2.2 "wc
Real altitude
= 3000 ft - Real temperature = 88 °F
= 88 °F - 68°F (reference temp.) = 20°F (equiva-
lent 1000 ft variation)
Proceeding as described above and considering a "virtual altitude"
of (3000 + 1000) ft:
–
the corrected capacity is 4468 MBtu/hr
–
the corrected burner air pressure is 3.59" wc.
Altitude
610
915
1220
2000
3000
4000
1229
1248
1268
1762
1781
1801
2296
2315
2335
2829
2848
2868
3362
3381
3401
3896
3915
3935
4429
4448
4468
4962
4981
5001
5496
5515
5535
6029
6048
6068
942.8
908.2
875.8
371
358
345
Altitude
610
915
1220
2000
3000
4000
0.58
0.96
1.37
1.14
1.52
1.93
1.69
2.07
2.48
2.25
2.63
3.04
2.8
3.18
3.59
3.36
3.74
4.15
3.91
4.29
4.7
4.47
4.85
5.26
5.02
5.4
5.81
5.58
5.96
6.37
942.8
908.2
875.8
371
358
345
GB
1525
1830
2135
5000
6000
7000
1290
1313
1337
1823
1846
1870
2357
2380
2404
2890
2913
2937
3423
3446
3470
3957
3980
4004
4490
4513
4537
5023
5046
5070
5557
5580
5604
6090
6113
6137
843.5
811.85
779.8
332
320
307
1525
1830
2135
5000
6000
7000
1.8
2.26
2.74
2.36
2.82
3.3
2.91
3.37
3.85
3.47
3.93
4.41
4.02
4.48
4.96
4.58
5.04
5.52
5.13
5.59
6.07
5.69
6.15
6.63
6.24
6.7
7.18
6.8
7.26
7.74
843.5
811.85
779.8
332
320
307
2440
8000
1363
1896
2430
2963
3496
4030
4563
5096
5630
6163
747.8
294
2440
8000
3.25
3.81
4.36
4.92
5.47
6.03
6.58
7.14
7.69
8.25
747.8
294
20095062
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