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3.7.1
Procedure to refer burner operating condition
at an altitude and/or at a combustion supporter
air temperature different to the standard values
(328 ft above sea level, 68 °F).
Altitude
Altitude
bar. press.
ft a.s.l.
m a.s.l.
"w.c.
0
0
328
100
1.000
305
2.000
610
3.000
915
4.000
1.220
5.000
1.525
6.000
1.830
7.000
2.135
8.000
2.440
F - correction factor of discharge head and delivery in relation to temperature and altitude.
Reference conditions:
–
Air temperature 68 °F (20 °C)
–
Barometric pressure 394 ''w.c. (1000 mbar)
–
Altitude 328 ft a.s.l. (100 m a.s.l.)
20095042
Technical description of the burner
bar. press.
0
mbar
32
399
1013,00
1,087
394
1000,00
1,073
385
977,40
1,049
371
942,80
1,012
358
908,20
0,975
345
875,80
0,940
332
843,50
0,905
320
811,85
0,871
307
779,80
0,837
294
747,80
0,803
AIR TEMPERATURE
5
10
15
41
50
59
1,068
1,049
1,031
1,054
1,035
1,017
1,030
1,012
0,994
0,994
0,976
0,959
0,957
0,940
0,924
0,923
0,907
0,891
0,889
0,873
0,858
0,856
0,841
0,826
0,822
0,807
0,793
0,788
0,774
0,761
Example
Using the Tab. G , for an altitude of 3,000 ft and an air temperature
of 68 °F, an F factor value is obtained equal to 0.908;
if the capacity at the boiler furnace is Qfoc = 4,500 Mbtu/h, the cor-
rect output will be equal to:
Qburner = Qfoc / F = 4,500 / 0.908 = 4,956 Mbtu/h
10
GB
20
25
30
68
77
86
1,013
0,996
0,980
1,000
0,983
0,967
0,977
0,961
0,945
0,943
0,927
0,912
0,908
0,893
0,878
0,876
0,861
0,847
0,844
0,829
0,816
0,812
0,798
0,785
0,780
0,767
0,754
0,748
0,735
0,723
40
°C
104
°F
0,948
0,936
0,915
0,883
0,850
0,820
0,790
0,760
0,730
0,700
Tab. G
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