17
PROCEDURE TO REFER BURNER OPERATING CONDITION IN HIGH ALTITUDE PLANTS
-
Find the corrected burner capacity for the plant’s altitude in chart 1 and the corrected pressure in chart 2.
-
Check in the firing rate graph of the burner (page 5), if the working point defined by the values above is within the range limits.
If not, higher burner size is needed.
Reference conditions (Charts 1-2): Ambient temperature 68 °F (20 °C) - Barometric pressure 394” WC (1000 mbar) - Altitude 328 ft a.s.l. (100 m a.s.l.)
Note
Charts are based only on altitude variation
(reference temperature = 68°F , 20°C)
To get the combined correction in case of different
air temperature, a compensation of 1000 ft each
20°F (305 m each 11°C) is applicable.
Example
Rated capacity = 3000 MBtu/hr - Rated air pressure = 1.5”w.c.
Real altitude = 5000 ft - Real temperature = 108°F
∆
= 108°F - 68°F (reference temp.) = 40°F (equivalent 2000 ft variation)
Proceeding as descripted above and considering a “virtual altitude” of (5000 + 2000) ft:
- the corrected capacity is 3847 MBtu/hr;
- the corrected burner air pressure is 1.92.
Burner RS 160/M LN is OK
'
m. a.s.l.
0
100
305
610
915
1220
1525
1830
2135
2440
ft a.s.l
0
328
1000
2000
3000
4000
5000
6000
7000
8000
500
494
500
512
530
551
571
593
616
641
669
1000
987
1000
1023
1061
1101
1142
1186
1232
1282
1337
1500
1481
1500
1535
1591
1652
1713
1778
1848
1924
2006
2000
1974
2000
2046
2121
2202
2284
2371
2464
2565
2675
2500
2468
2500
2558
2652
2753
2855
2964
3079
3206
3343
3000
2962
3000
3069
3182
3303
3425
3557
3695
3847
4012
3500
3455
3500
3581
3712
3854
3996
4149
4311
4488
4680
4000
3949
4000
4092
4243
4404
4567
4742
4927
5130
5349
4500
4442
4500
4604
4773
4955
5138
5335
5543
5771
6018
5000
4936
5000
5116
5303
5505
5709
5928
6159
6412
6686
5500
5429
5500
5627
5834
6056
6280
6520
6775
7053
7355
6000
5923
6000
6139
6364
6606
6851
7113
7391
7694
8024
6500
6417
6500
6650
6894
7157
7422
7706
8006
8335
8692
7000
6910
7000
7162
7425
7708
7993
8299
8622
8977
9361
7500
7404
7500
7673
7955
8258
8564
8892
9238
9618
10029
8000
7897
8000
8185
8485
8809
9135
9484
9854
10259
10698
8500
8391
8500
8697
9016
9359
9705
10077
10470
10900
11367
9000
8885
9000
9208
9546
9910
10276
10670
11086
11541
12035
9500
9378
9500
9720
10076
10460
10847
11263
11702
12183
12704
10000
9872
10000
10231
10607
11011
11418
11855
12318
12824
13373
Average barometric
Pressure (20°C)
mbar
1013
1000
977,4
942,8
908,2
875,8
843,5
811,85
779,8
747,8
Average barometric
Pressure (68°F)
"w.c.
399
394
385
371
358
345
332
320
307
294
Rated Capacity
Altitude
CORRECTED BURNER CAPACITY ACCORDING TO ALTITUDE
1
m. a.s.l.
0
100
305
610
915
1220
1525
1830
2135
2440
ft a.s.l
0
328
1000
2000
3000
4000
5000
6000
7000
8000
0,50
0,49
0,50
0,51
0,53
0,55
0,57
0,59
0,62
0,64
0,67
1,00
0,99
1,00
1,02
1,06
1,10
1,14
1,19
1,23
1,28
1,34
1,50
1,48
1,50
1,53
1,59
1,65
1,71
1,78
1,85
1,92
2,01
2,00
1,97
2,00
2,05
2,12
2,20
2,28
2,37
2,46
2,56
2,67
2,50
2,47
2,50
2,56
2,65
2,75
2,85
2,96
3,08
3,21
3,34
3,00
2,96
3,00
3,07
3,18
3,30
3,43
3,56
3,70
3,85
4,01
3,50
3,46
3,50
3,58
3,71
3,85
4,00
4,15
4,31
4,49
4,68
4,00
3,95
4,00
4,09
4,24
4,40
4,57
4,74
4,93
5,13
5,35
4,50
4,44
4,50
4,60
4,77
4,95
5,14
5,33
5,54
5,77
6,02
5,00
4,94
5,00
5,12
5,30
5,51
5,71
5,93
6,16
6,41
6,69
5,50
5,43
5,50
5,63
5,83
6,06
6,28
6,52
6,77
7,05
7,35
6,00
5,92
6,00
6,14
6,36
6,61
6,85
7,11
7,39
7,69
8,02
6,50
6,42
6,50
6,65
6,89
7,16
7,42
7,71
8,01
8,34
8,69
7,00
6,91
7,00
7,16
7,42
7,71
7,99
8,30
8,62
8,98
9,36
7,50
7,40
7,50
7,67
7,96
8,26
8,56
8,89
9,24
9,62
10,03
8,00
7,90
8,00
8,18
8,49
8,81
9,13
9,48
9,85
10,26
10,70
8,50
8,39
8,50
8,70
9,02
9,36
9,71
10,08
10,47
10,90
11,37
9,00
8,88
9,00
9,21
9,55
9,91
10,28
10,67
11,09
11,54
12,04
9,50
9,38
9,50
9,72
10,08
10,46
10,85
11,26
11,70
12,18
12,70
10,00
9,87
10,00
10,23
10,61
11,01
11,42
11,86
12,32
12,82
13,37
Average barometric
Pressure (20°C)
mbar
1013
1000
977,4
942,8
908,2
875,8
843,5
811,85
779,8
747,8
Average barometric
Pressure (68°F)
"w.c.
399
394
385
371
358
345
332
320
307
294
Rated Pressure
Altitude
CORRECTED BURNER AIR PRESSURE ACCORDING TO ALTITUDE
2
Содержание 20011691
Страница 2: ......
