20037075
30
GB
Installation
4.10.3 Gas pressure
The Tab. I shows minimum pressure losses along the gas supply
line depending on the maximum burner output operation.
The values shown in the Tab. I refer to natural gas (GCV).
Column 1
Pressure loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 23), with:
–
combustion chamber at “WC;
–
burner working at maximum output;
–
combustion head adjusted as in the diagram of Fig. 18 at
page 26.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 23) 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. 23);
–
find, in the Tab. I relating to the burner concerned, the pressure
value closest to the result of the subtraction;
–
read off the corresponding output on the left.
Example for RS 500/EV FGR:
•
Maximum output operation
•
Gas pressure at test point 1)(Fig. 23)
=
11.7 “WC
•
Pressure in combustion chamber
=
2 “WC
11.7 - 2
=
9.7 “WC
An output of 15148 MBtu/hr shown in Tab. I 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.
Note
See the accompanying instructions for the adjustment of the gas
train.
Tab. I
1
2
Fig. 23
S8329
MBtu/hr (GCV)
1
∆
p (“WC)
2
∆
p (“WC)
R
S
3
0
0
/E
V
F
G
R
5112
3.3
0.63
5680
3.7
0.79
7574
4.9
1.38
9467
5.4
2.13
11361
5.9
3
13254
7.9
4.2
14390
9
5.1
R
S
4
0
0
/E
V
F
G
R
6816
2.3
1.1
7574
3
1.38
9467
4.7
2.13
11361
6.4
3
12307
7.3
3.62
13254
8.3
5.17
15148
10.8
5.47
17042
13
7
R
S
5
0
0
/E
V
F
G
R
9467
4.4
1.81
11361
6
2.64
13254
7.7
3
15148
9.7
3.82
17042
11.8
4.64
18935
14.1
5.55
19692
15
5.9
R
S
6
5
0
/E
V
F
G
R
11362
2.8
1
13255
4
1.4
15149
5.1
1.8
17043
6.2
2.2
18936
7.7
2.8
20830
9.3
3.3
22724
10.9
4
24617
12.6
4.7
24805
13.1
4.9
R
S
8
0
0
/E
V
F
G
R
13254
4.5
0.2
15148
4.8
0.2
18935
7.4
0.4
22723
10.1
0.5
26510
13.8
0.7
30297
17.6
0.9
30676
17.9
0.9
Summary of Contents for RS 300/EV FGR
Page 2: ......
