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4.14.3 Gas pressure
The Tab. K shows minimum pressure losses along the gas supply
line depending on the maximum burner output operation.
The values shown in the Tab. K refer to natural gas (GCV).
Column 1
Pressure loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 29), with:
–
combustion chamber at "WC;
–
burner working at maximum output;
–
combustion head adjusted as in the diagram of Fig. 20 at
page 27.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 29) 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. 29);
–
find, in the Tab. K 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 500/EV FGR:
•
Maximum output operation
•
Gas pressure at test point 1)(Fig. 29)
•
Pressure in combustion chamber
An output of 15148 MBtu/hr shown in Tab. K 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.
S8329
Note
See the accompanying instructions for the adjustment of the gas
train.
=
11.7 "WC
=
2 "WC
11.7 - 2
=
9.7 "WC
1
2
Installation
MBtu/hr (GCV)
5112
5680
7574
9467
11361
13254
14390
6816
7574
9467
11361
12307
13254
15148
17042
9467
11361
13254
15148
17042
18935
19692
11362
13255
15149
17043
18936
20830
22724
24617
24805
13255
15149
17043
18936
20830
22724
Fig. 29
24617
26511
28405
30299
35
GB
1 ∆p ("WC)
2 ∆p ("WC)
3.3
0.63
3.7
0.79
4.9
1.38
5.4
2.13
5.9
3
7.9
4.2
9
5.1
2.3
1.1
3
1.38
4.7
2.13
6.4
3
7.3
3.62
8.3
5.17
10.8
5.47
13
7
4.4
1.81
6
2.64
7.7
3
9.7
3.82
11.8
4.64
14.1
5.55
15
5.9
2.8
1
4
1.4
5.1
1.8
6.2
2.2
7.7
2.8
9.3
3.3
10.9
4
12.6
4.7
13.1
4.9
4.5
1.1
6
1.4
7.5
1.8
8.9
2.2
10.4
2.6
11.9
3.1
13.9
3.7
15.3
4.3
17.6
4.9
19.9
5.6
Tab. K
20037168
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