Appendix - Gas Supply Pressure - Riello RS 44/E MZ Installation, Use And Maintenance Instructions

Appendix - Gas supply pressure

C
The tables show minimum load losses along the gas supply
line depending on the maximum burner output operation.
Column 1
Load loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 38), with:
• combustion chamber at 0 mbar;
• burner working at maximum output;
Column 2
Load loss at gas butterfly valve 2)(Fig. 38) with maximum
opening: 90°.
The values shown in the tables refer to:
natural gas G 20 PCI 9.45 kWh/Sm
To know the approximate output at which the burner is
operating at its maximum:
- Subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 38);
- 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 44/E MZ:
• Maximum output operation
• Natural gas G 20 PCI 9.45 kWh/Sm
• Gas pressure at test point 1)(Fig. 38)
• Pressure in combustion chamber
10.9 - 2.0
A maximum output of 350 kW shown in Table RS 44/E MZ
corresponds to 8.9 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. 38),
set the maximum output required from the burner opera-
tion, then:
- find the nearest output value in the table for the burner in
question.
- Read, on the right (column 1) the socket pressure 1)(Fig.
38);
- add this value to the estimated pressure in the combus-
tion chamber.
Example - RS 44/E MZ:
• Maximum output required: 350 kW
• Natural gas G 20 PCI 9.45 kWh/Sm
• Gas pressure at output of 350 kW, taken from table RS 44/
E MZ, column 1
• Pressure in combustion chamber
8.9 + 2.0
gas pressure at test point 1)(Fig. 38)
3 3
(8.2 Mcal/Sm )
3
= 10.9 mbar
= 2.0 mbar
= 8.9 mbar
3
= 8.9 mbar
= 2.0 mbar
= 10.9 mbar
RS 34/E MZ
1 p (mbar) 2 p (mbar)
kW
G20 G20
130 1,5 0,1
140 2,0 0,1
160 2,9 0,1
180 3,8 0,2
200 4,6 0,2
220 5,5 0,3
240 6,4 0,3
260 7,3 0,4
280 8,2 0,4
300 9,1 0,5
320 10,0 0,5
340 10,9 0,6
360 11,8 0,7
380 12,7 0,8
390 13,1 0,8
S8738
56
GB
RS 44/E MZ
1 p (mbar) 2 p (mbar)
kW
G20 G20
200 3,0 0,2
225 4,0 0,3
250 4,9 0,3
275 5,9 0,4
300 6,9 0,5
325 7,9 0,6
350 8,9 0,6
375 9,8 0,7
400 10,8 0,8
425 11,8 1,0
450 12,8 1,1
475 13,8 1,2
500 14,7 1,3
525 15,7 1,5
550 16,7 1,6
1
2
Fig. 38
6383