C Appendix - Gas Supply Pressure - Riello RS 70/E MZ Installation, Use And Maintenance Instructions

Appendix - Gas supply pressure
C
The adjacent tables show minimum load losses along the gas sup-
ply line depending on the maximum burner output operation.
Column 1
Load loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 40), with:
• Combustion chamber at 0 mbar;
• Burner working at maximum output;
• Combustion head adjusted according to the diagram of Fig. 17.
Column 2
Load loss at gas butterfly valve 2)(Fig. 40) with maximum opening:
90°.
Column 3
Load loss at train 3)(Fig. 40) including: adjustment valve VR,
safety valve VS (both fully open), pressure adjuster R, filter F.
The values shown in the tables refer to:
natural gas G 20 PCI 9.45 kWh/Sm
3
(8.2 Mcal/Sm )
With:
natural gas G 25 PCI 8.13 kWh/Sm
3
(7.0 Mcal/Sm ) multiply the values of the tables:
- columns 1-2: by 1.5;
- column 3: by 1.35.
To know the approximate output at which the burner is operating
at its maximum:
- Subtract the combustion chamber pressure from the gas pres-
sure measured at test point 1)(Fig. 40).
- Find, in the table relating to the burner concerned, column 1, the
pressure value closest to the result you want.
- Read the corresponding output on the left.
Example - RS 190/E:
• Maximum output operation
• Natural gas G 20 PCI 9.45 kWh/Sm
• Combustion head adjusted according to the diagram of Fig. 17.
• Gas pressure at test point 1)(Fig. 40)
• Pressure in combustion chamber
14.5 - 3.0
A maximum output of 2000 kW shown in Table RS 190/E corre-
sponds to 11.5 mbar pressure, column 1.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To know the required gas pressure at test point 1)(Fig. 40), set the
maximum output required from the burner operation, then:
- Find the nearest output value in the table for the burner in ques-
tion.
- Read, on the right (column 1) the socket pressure 1)(Fig. 40).
- Add this value to the estimated pressure in the combustion
chamber.
Example - RS 190/E:
• Maximum output required: 2000 kW
• Natural gas G 20 PCI 9.45 kWh/Sm
• Combustion head adjusted according to the diagram of Fig. 17.
• Gas pressure at output of 2000 kW, taken from table RS 190/E,
column 1
• Pressure in combustion chamber
11.5 + 3.0
pressure required at test point 1)(Fig. 40).
Fig. 40
52
GB
3
3
3
= 14.5 mbar
= 3.0 mbar
= 11.5 mbar
3
= 11.5 mbar
= 3.0 mbar
= 14.5 mbar
D3734
RS 70/E MZ
kW 1 2
Ø 1"1/4
3970256
465
500 19.9
550 23.2
600 26.7
650 30.3
700 34.0
750 37.7
800 41.5
814
RS 100/E MZ
kW 1 2
Ø 1"1/4
3970256
695
700 34.0
750 37.7
800 41.5
850
900
1000
1100
1163
RS 130/E MZ
kW 1 2
Ø 1"1/2
3970250
930 25.0
1000 27.7
1100 31.9
1200 36.1
1300 40.5
1400 45.9
1500 51.2
1512
RS 190/E
kW 1 2
Ø 1"1/2
3970250
1280 9.6 1.3 39.5
1400 9.7 1.6 45.9
1600 9.8 2.1 56.5
1800 9.9 2.7 67.2
2000 11.5 3.3 -
2100 12.6 3.6 -
2290 14.9 4.3 -
RS 250/E MZ
kW 1 2
Ø 1"1/2
3970250
1250 5.2 1.3 38.2
1500 7.2 1.8 51.2
1750 9.3 2.5 64.5
2000 11.3 3.3 -
2250 14.1 4.2 -
2500 17.0 5.1 -
2650 19.4 5.8 -
∆p (mbar)
3
Ø 1"1/2 Ø 2" Ø 2" DN 65
3970250 3970252 3970221 3970222
10.1 7.0 4.2
11.6 8.2 4.4
13.2 9.5 4.6
14.7 10.8 4.9
16.4 12.1 5.1
18.0 13.4 5.4
19.9 14.8 5.8
∆p (mbar)
3
Ø 1"1/2 Ø 2" Ø 2" DN 65
3970250 3970252 3970221 3970222
16.4 12.1 5.1
18.0 13.4 5.4
19.9 14.8 5.8
27.7 20.6 8.9
∆p (mbar)
3
Ø 2" Ø 2" DN 65 DN 80
3970252 3970221 3970222 3970223
18.6 8.2 5.2
20.6 8.9 5.5
23.9 10.2 6.1
27.2 11.6 6.7
30.9 13.1 7.3
35.2 15.0 8.1
39.6 17.0 8.9
∆p (mbar)
3
Ø 2" Ø 2" DN 65 DN 80
3970252 3970221 3970222 3970223
30.0 12.7 7.1
35.2 15.0 8.1
43.9 19.0 9.8
52.7 23.1 11.5
62.2 27.5 13.5
67.6 30.0 14.6
77.8 34.8 16.9
∆p (mbar)
3
Ø 2" Ø 2" DN 65 DN 80
3970252 3970221 3970222 3970223
28.9 12.3 6.9
39.6 17.0 8.9
50.5 22.0 11.1
62.2 27.5 13.5
75.7 33.8 16.4
- 40.2 19.3
- 45.0 21.2
3.6
3.7
3.9
4.1
4.2
4.4
4.6
4.2
4.4
4.6
5.5
3.9
4.0
4.3
4.6
4.9
5.2
5.5
4.8
5.2
5.8
6.5
7.3
7.7
8.6
4.7
5.5
6.3
7.3
8.5
9.7
10.5