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

RS 34 MZ
kW 1 2
MB 405
3970500
125 0.3 0.1 14.7
150 0.9 0.1 20.6
200 2.0 0.1 32.8
250 3.1 0.2 46.8
300 4.3 0.3
350 5.9 0.4
390 7.1 0.6
RS 44 MZ
kW 1 2
MB 407
3970553
200 0.8 0.1 18.2
250 1.8 0.2 26.4
300 2.8 0.3 36.9
350 3.9 0.4 48.2
400 4.9 0.6
450 6.1 0.7
500 7.5 0.9
550 9.0 1.1
(A)
3
VS
F
(B)
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∆p (mbar)
3
MB 407 MB 410 MB 412
3970553 3970554 3970144
8.0 4.2 2.2
11.3 5.7 2.9
18.2 9.1 4.5
26.4 13.2 6.5
36.9 18.1 8.7
48.2 23.0 11.3
57.5 27.1 13.5
∆p (mbar)
3
MB 410 MB 412 MB 415
3970554 3970144 3970180
9.1 4.5 3.2
13.2 6.5 3.8
18.1 8.7 4.9
23.0 11.3 6.1
28.3 14.1 7.4
34.0 16.9 8.7
40.0 19.9 10.1
45.9 23.2 11.6
R
VR

GAS PRESSURE

The adjacent tables show minimum pressure
losses along the gas supply line depending on
the maximum burner output operation.
MB 420
Column 1
MB 415
3970181
Pressure loss at combustion head.
3970180
3970182 Pressure of the gas at the socket 1)(B), with
combustion chamber at 0 mbar.
3.2 3.2
Column 2
3.2 3.2
Pressure loss at gas butterfly valve 2)(B) with
3.2 3.2 maximum opening: 90°.
3.8 3.2
Column 3
Pressure loss of gas train 3)(B) includes: adjust-
4.9 3.4
ment valve VR, safety valve VS (both fully
6.1 4.3
open), pressure governor R, filter F.
7.1 5.0
The values shown in the various tables refer to:
natural gas G 20 PCI 9.45 kWh/Sm
(8.2 Mcal/Sm
With:
natural gas G 25 PCI 8.13 kWh/Sm
(7.0 Mcal/Sm
multiply the values of the table:
MB 420
- columns 1-2: by 1.5;
3970181
- column 3: by 1.35.
3970182
Calculate the approximate maximum output of
3.2 the burner in this way:
- subtract the combustion chamber pressure
3.2
from the gas pressure measured at test
3.4
point 1)(B).
- Find, in the table relating to the burner con-
4.3
cerned, the pressure value closest to the
5.2
result of the subtraction.
- Read off the corresponding output on the left.
6.1
Example - RS 34 MZ:
7.0
• Maximum output operation
8.2
• Natural gas G 20 PCI 9.45 kWh/Sm
• Gas pressure at test point 1)(B)
• Pressure in combustion chamber
A pressure of 3.1 mbar (column 1) corresponds in
the table RS 34 MZ to an output of 250 kW.
This value serves as a rough guide, the effective
delivery must be measured at the gas meter.
1
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.
D3790
- Read off the pressure at test point 1)(B) on
the right in column 1.
2
- Add this value to the estimated pressure in
the combustion chamber.
Example - RS 34 MZ:
• Required burner maximum output operation:
250 kW
• Natural gas G 20 PCI 9.45 kWh/Sm
• Pressure of the gas at an output of 250 kW,
from the table RS 34 MZ, column 1
• Pressure in combustion chamber
pressure required at test point 1)(B).
5
3
3
)
3
3
)
3
=5.1 mbar
= 2 mbar
5.1 - 2 =3.1 mbar
3
=3.1 mbar
= 2 mbar
3.1 + 2 =5.1 mbar