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3.8
Firing rate
MAXIMUM OUTPUT must be selected in area A (Fig. 4).
MINIMUM OUTPUT must not be lower than the minimum limit
shown in the diagram:
Model
RLS 130/E
NOTE:
The firing rate area given in Fig. 4 have been reduced by 10% with
respect to the maximum range that can be reached.
The firing rate area values have been obtained con-
sidering an ambient temperature of 68 °F, and an
atmospheric pressure of 394" WC and with the
combustion head adjusted.
WARNING
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. 4), 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 = 4000 MBtu/hr - Rated air pressure = 1 "WC
Real altitude
= 3000 ft - Real temperature = 88 °F
= 88 °F - 68°F (reference temp.) = 20°F (equiva-
lent 1000 ft variation)
Proceeding as descripted above and considering a "virtual altitude"
of (3000 + 1000) ft:
–
the corrected capacity is 4567 MBtu/hr
–
the corrected burner air pressure is 1.14
20031446
Technical description of the burner
MBtu/hr
GPH
1750
12.5
10
GB
D10920
Fig. 4
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