Procedure To Refer Burner Operating Condition In High Altitude Plants - Riello RS 300/EV FGR Installation, Use And Maintenance Instructions

26
24
22
20
18
16
14
12
10
8
6
4
2
0
0 2000
D11425
0 400 800
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.).
20037075
Technical description of the burner
4000 6000 8000 10000 12000
1200 2400 2800 3200 3600 4000
1600 2000
Firing rate for C-ETL Canadian Listing
RS 800/EV FGR
RS 650/EV FGR
14000 16000 18000 20000 22000
4800 5600 6000 6400 6800
4400 5200
14 GB
MBtu/h
24000 26000 28000 30000
kW
7200 7600 8000 8800
8400 9200
10
9
8
7
6
5
4
3
2
1
0
Power output
Fig. 6