Gas Pressure - Riello RS 34 MZ Instrucciones De Instalación, Uso Y Mantenimiento

RS 34 MZ
kW
130
140
160
180
200
220
240
260
280
300
320
340
360
380
390
RS 44 MZ
kW
200
225
250
275
300
325
350
375
400
425
450
475
500
525
550
(A)
(B)
1
p (mbar)
1,5
2,0
2,9
3,8
4,6
5,5
6,4
7,3
8,2
9,1
10,0
10,9
11,8
12,7
13,1
1
p (mbar)
3,0
4,0
4,9
5,9
6,9
7,9
8,9
9,8
10,8
11,8
12,8
13,8
14,7
15,7
16,7
1
2
2
p (mbar)
0,1
0,1
0,1
0,2
0,2
0,3
0,3
0,4
0,4
0,5
0,5
0,6
0,7
0,8
0,8
2
p (mbar)
0,2
0,3
0,3
0,4
0,5
0,6
0,6
0,7
0,8
1,0
1,1
1,2
1,3
1,5
1,6
S8738
6

GAS PRESSURE

The adjacent tables show minimum pressure
losses along the gas supply line depending on
the maximum burner output operation.
Column 1
Pressure loss at combustion head.
Pressure of the gas at the socket 1)(B), with
combustion chamber at 0 mbar.
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
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 table:
- columns 1-2: by 1.5;
- column 3: by 1.35.
Calculate the approximate maximum output of
the burner in this way:
- subtract the combustion chamber pressure
from the gas pressure measured at test
point 1)(B).
- Find, in the table relating to the burner con-
cerned, the pressure value closest to the
result of the subtraction.
- Read off the corresponding output on the left.
Example - RS 34 MZ:
• Maximum output operation
• Natural gas G 20 PCI 9.45 kWh/Sm
• Gas pressure at test point 1)(B)
• Pressure in combustion chamber
A pressure of 7.3 mbar (column 1) corresponds in
the table RS 34 MZ to an output of 260 kW.
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 maximum output required
from the burner operation:
- find the nearest output value in the table for
the burner in question.
- Read off the pressure at test point 1)(B) on
the right in column 1.
- Add this value to the estimated pressure in
the combustion chamber.
Example - RS 34 MZ:
• Required burner maximum output operation:
260 kW
• Natural gas G 20 PCI 9.45 kWh/Sm
• Pressure of the gas at an output of 260 kW,
from the table RS 34 MZ, column 1
• Pressure in combustion chamber
7.3 + 2 =9.3 mbar
pressure required at test point 1)(B).
The data of thermal output and
combustion head gas pressure are
related to full open (90°) gas butterfly
valve.
3
3 
3
=9.3 mbar
= 2 mbar
9.3 - 2 =7.3 mbar
3
=7.3 mbar
= 2 mbar