Gas Pressure - Riello RS 34 MZ Installation, Use And Maintenance Instructions

RS 34 MZ
1 2
p p
kW
MB DLE 407
(mbar) (mbar)
B01 S20
130 1.5 0.1 8.6
140 2.0 0.1 9.7
160 2.9 0.1 12.3
180 3.8 0.2 15.1
200 4.6 0.2 18.1
220 5.5 0.3 21.2
240 6.4 0.3 24.6
260 7.3 0.4 28.2
280 8.2 0.4 32.3
300 9.1 0.5 36.6
320 10.0 0.5 41.2
340 10.9 0.6 45.6
360 11.8 0.7 50.2
380 12.7 0.8 54.9
390 13.1 0.8 57.4
RS 44 MZ
1 2
p p
kW
MB DLE 407
(mbar) (mbar)
B01 S20
200 3.0 0.2 18.1
225 4.0 0.3 22.1
250 4.9 0.3 26.4
275 5.9 0.4 31.3
300 6.9 0.5 36.6
325 7.9 0.6 42.2
350 8.9 0.6 47.8
375 9.8 0.7 53.7
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 -
(A)
3
V S
F
(B)
3 p (mbar)
MB DLE 410 MB DLE 412
B01 S20 B01 S20
4.4 2.3
5.0 2.6
6.2 3.2
7.6 3.8
9.0 4.5
10.6 5.3
12.3 6.1
14.1 6.9
16.0 7.8
18.0 8.7
20.0 9.6
22.0 10.7
23.9 11.8
26.0 13.0
27.0 13.5
3 p (mbar)
MB DLE 407 MB DLE 410 MB DLE 412
B01 S52 B01 S20 B01 S20
18.1 9.0 4.5
22.1 11.0 5.5
26.4 13.2 6.5
31.3 15.5 7.6
36.6 18.0 8.7
42.2 20.5 9.9
47.8 22.9 11.2
53.7 25.4 12.7
59.9 28.1 14.0
66.4 30.8 15.4
73.2 33.6 16.8
80.3 36.5 18.3
87.6 39.5 19.8
95.1 42.6 21.4
103.0 45.8 23.1
R V R
MB DLE 415 MB DLE 420
B01 S20 B01 S20
3.2 3.2
3.2 3.2
3.2 3.2
3.2 3.2
3.2 3.2
3.2 3.2
3.2 3.2
3.5 3.2
3.9 3.2
4.3 3.2
4.7 3.2
5.1 3.3
5.6 3.5
6.0 3.8
6.3 4.0
MB DLE 415 MB DLE 420
B01 S20 B01 S20
3.2 3.2
3.2 3.2
3.3 3.2
3.8 3.2
4.3 3.2
4.8 3.2
5.4 3.4
5.9 3.8
6.5 4.1
7.1 4.5
7.7 4.9
8.3 5.3
9.0 5.7
9.6 6.1
10.2 6.6
1
D3790
2
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°.
Column 3
Pressure loss of gas train 3)(B) includes: adjust-
ment valve VR, safety valve VS (both fully
open), pressure governor R, filter F.
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).
3
3
3
=9.3 mbar
= 2 mbar
9.3 - 2 =7.3 mbar
3
=7.3 mbar
= 2 mbar