29
06/2011 - Art. Nr. 13 018 118C
Overview
Gas valve selection
N.B.:
•
The pressure loss specified in the table
is to be added to the combustion
chamber pressure of the boiler in mbar
with the rated load.
•
The calculated gas flow pressure is to be
complied with at the gas valve inlet. To
calculate the gas flow pressures required
at the transfer station it is also necessary
to take into account the pressure loss of
the gas supply from the transfer station
to the gas valve inlet incl. all valves
contained therein (cut-out valves, com-
pensator, gas counter, TAS, additional
filter, etc.).
•
The operating point of the system must
be within the permissible working range
of the burner.
Example: VGL 06.2100 DP
•
System data:
–
Gas type:
natural gas E
–
Required burner power:
1600 kW
–
Combustion chamber pressure with boiler rated load:
3 mbar
–
Gas flow pressure at transfer station with boiler rated load:
30 mbar
–
Gas supply pressure loss with boiler rated load:
1 mbar
•
Selected gas valve:
VGD40.065
•
Checking the selection:
–
Gas pressure loss from gas valve (from table):
25 mbar
–
Combustion chamber pressure:
3 mbar
–
Gas supply pressure loss
1 mbar
–
Total
29 mbar
–
Hence: gas flow pressure at transfer station:
30 mbar > 29 mbar
ð
Selection of VGD40.065 correct.
VGL 06.1200
DP
Burner
power
(kW)
MBVEF
412
MBVEF
420
VGD20
Rp2
VGD40
DN65
MBVEF
420
VGD20
Rp2
VGD40
DN65
MBVEF
412
MBVEF
420
Natural gas E Hi = 10.365 kWh/m
3
Natural gas LL Hi = 8.83 kWh/m
3
Propane gas
Hi=25.89kWh/m³
Gas pressure loss (from gas valve inlet)
800
18
15
15
15
21
15
15
15
15
900
23
18
15
15
27
19
15
17
15
950
26
20
15
15
30
21
16
19
15
1000
29
22
16
15
33
23
17
21
15
1100
35
27
19
15
40
28
21
25
15
1200
41
32
23
17
48
33
25
30
15
VGL
06.2100 DP
Burner
power
(kW)
MBVEF
420
VGD20
Rp2
VGD40
DN65
VGD40
DN80
MBVEF
420
VGD20
Rp2
VGD40
DN65
MBVEF
420
Natural gas E Hi = 10.365 kWh/m
3
Natural gas LL Hi = 8.83 kWh/m
3
Propane gas
Hi=25.89kWh/m³
Gas pressure loss (from gas valve inlet)
1100
23
17
15
15
33
25
15
15
1150
25
18
15
15
36
27
15
15
1200
27
20
15
15
40
29
17
15
1250
30
22
15
15
43
32
18
15
1300
32
23
17
15
47
34
20
15
1400
37
27
19
15
54
40
23
15
1500
43
31
22
16
62
46
26
15
1600
49
35
25
18
71
52
30
17
1700
55
40
28
20
80
59
33
20
1800
62
45
32
22
89
66
37
22
1900
69
50
35
25
100
74
42
25
2000
76
55
39
28
-
82
46
27
2100
84
61
43
30
-
90
51
30
EN
VGL 06.1600
DP
Burner
power
(kW)
MBVEF
412
MBVEF
420
VGD20
Rp2
VGD40
DN65
VGD40
DN80
MBVEF
420
VGD20
Rp2
VGD40
DN65
MBVEF
412
MBVEF
420
Natural gas E Hi = 10.365 kWh/m
3
Natural gas LL Hi = 8.83 kWh/m
3
Propane gas
Hi=25.89kWh/m³
Gas pressure loss (from gas valve inlet)
800
18
15
15
15
15
21
15
15
15
15
900
23
18
15
15
15
27
19
15
17
15
950
26
20
15
15
15
30
21
16
19
15
1000
29
22
16
15
15
33
23
17
21
15
1100
35
27
19
15
15
40
28
21
25
15
1200
41
32
23
17
15
48
33
25
30
15
1300
-
37
26
20
15
56
39
29
-
17
1400
-
43
31
23
17
65
45
34
-
20
1500
-
50
35
26
20
74
52
39
-
23
1600
-
57
40
30
22
85
59
44
-
26
Summary of Contents for VGL 06.1200 DP
Page 26: ......
