Gas Pressure - Riello RS 190 Installation, Use And Maintenance Instructions

kW
G 20
1280 9.6
1500 9.7
1800 9.9
2100 12.6
2290 14.9
(A)
(B)
1 p (mbar) 2 p (mbar)
G 25 G 20
14.3 1.3
14.5 1.8
14.8 2.7
18.8 3.6
22.2 4.3
1
2

GAS PRESSURE

The adjacent table shows minimum pressure
losses along the gas supply line depending on
G 25
the burner output in 2nd stage operation.
2.0
Column 1
2.7
Pressure loss at combustion head.
4.0
Gas pressure measured at test point 1)(B), with:
5.4
• Combustion chamber at 0 mbar
• Burner operating in 2nd stage
6.4
• Combustion head adjusted as indicated in
Column 2
Pressure loss at gas butterfly valve 2)(B) with
maximum opening: 90°.
The values shown in the various tables refer to:
– natural gas G 20 PCI 9,45 kWh/Sm
– natural gas G 25 PCI 8,13 kWh/Sm
Calculate the approximate 2nd stage output of
the burner thus:
- Subtract the combustion chamber pressure
S8883 - Find the nearest pressure value to your result
- Read off the corresponding output on the left.
Example:
• 2nd stage operation
• Gas pressure at test point 1)(B)
• Pressure in combustion chamber =
A 2nd stage output of 1800 kW shown in Table
(A) corresponds to 9.9 mbar pressure, column
1.
This value serves as a rough guide, the effective
delivery must be measured at the gas meter.
To calculate the required gas pressure at test
point 1)(B), set the output required from the
burner in 2nd stage operation:
- Find the nearest output value in the table (A).
- Read off the pressure at test point 1)(B) on
- Add this value to the estimated pressure in
Example:
• Required burner output in 2nd stage opera-
• Gas pressure at burner output of 1800 kW,
• Pressure in combustion chamber = 3 mbar
5
diagram (C)p. 7.
3
Mcal/Sm )
3
Mcal/Sm )
from the gas pressure measured at test point
1)(B).
in column 1 of the table (A).
12,9 - 3=9,9 mbar
the right in column 1.
the combustion chamber.
tion: 1800 kW
taken from table (A), column 1
9.9 + 3
pressure required at test point 1)(B).
3
(8,2
3
(7,0
=12.9 mbar
3 mbar
=9.9 mbar
=12.9 mbar