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4.14.2 Gas pressure
The Tab. O shows minimum pressure losses along the gas supply
line depending on the maximum burner output operation.
The values shown in the Tab. O refer to natural gas (GCV).
Column 1
Pressure loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 24), with:
–
combustion chamber at 0" WC;
–
burner working at maximum output;
–
combustion head adjusted as in the diagram of Fig. 16 on
page 23.
Column 2
Pressure loss at gas butterfly valve 17)(Fig. 3 on page 11) with
maximum opening: 90°.
Calculate the approximate maximum output of the burner as fol-
lows:
–
subtract the combustion chamber pressure from the gas pres-
sure measured at test point 1)(Fig. 24);
–
find, in the Tab. O relating to the burner concerned, the pres-
sure value closest to the result of the subtraction;
–
read off the corresponding output on the left.
Example for RLS 510/E:
•
Maximum output operation
•
Gas pressure at test point 1)(Fig. 24)
•
Pressure in combustion chamber
An output of 10500 MBtu/hr shown in Tab. O corresponds to
9.7 "WC pressure, column 1.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
20086798
The data of thermal output and combustion
head gas pressure are related to full open (90°)
gas butterfly valve.
WARNING
=
11.7 "WC
=
2 "WC
11.7 - 2
=
9.7 "WC
Installation
MBtu/hr ( GCV )
2.600
3.500
4.500
5.500
6.500
7.500
8.500
9.500
10.500
3.500
4.500
5.500
6.500
7.500
8.500
9.500
10.500
11.500
12.500
13.600
4.000
5.500
6.500
7.500
8.500
9.500
10.500
11.500
12.500
13.500
14.500
15.500
16.100
5.000
6.500
7.500
8.500
9.500
10.500
11.500
12.500
13.500
Fig. 24
14.500
15.500
17.500
18.500
19.200
31
GB
1 Δp ("WC)
2 Δp ("WC)
1.2
0.01
2.2
0.02
3.6
0.03
6.5
0.07
9.1
0.15
12.2
0.20
14.0
0.40
15.6
0.50
19.1
0.60
1.2
0.02
2.0
0.03
3.0
0.07
4.2
0.15
5.9
0.20
7.6
0.40
9.5
0.50
11.8
0.60
14.0
0.80
16.5
1.00
19.5
1.20
1.5
0
2.8
0
3.9
0.07
5.2
0.17
8.1
0.22
10.1
0.34
12.3
0.50
14.8
0.60
16.5
0.90
18.3
1.10
21.0
1.40
24.1
1.73
26.0
2.00
2.2
0.00
3.7
0.07
5.0
0.17
6.4
0.22
8.0
0.34
9.7
0.50
11.7
0.60
13.8
0.90
16.1
1.10
18.6
1.40
21.2
1.73
27.0
2.60
30.2
3.00
33.8
3.50
Tab. O
20106891
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