Riello VGD 50 Manuel D'entretien page 16

Fig. 6
GAS TRAIN PRESSURE LOSSES
The gas train pressure loss ∆p is provided
from the diagram Fig. 8; the scales of the vol-
umetric output V are valid respectively for :
0
a = air,
n = methane (G20),
p = propane (G30),
c = town gas (G140).
The minimum necessary pressure in the network
can be obtained by adding the pressure of the di-
agram to the burner pressure losses (see the
burner technical instruction) and the back pres-
sure of the combustion chamber (see the techni-
cal instruction of the heat generator).
V = V x f
gas used air
Air spec. weight
f =
Spec. weight of gas used
Spec. weight
Gas type
3
[ ]
Kg/m
Methane
0.81
Town gas
0.58
LPG
2.08
1.24
Air
D3208
dv f
0.65 1.24
0.47 1.46
1.67 0.77
1.00 1.00
DIAGRAMMA
D3117
3
V [Stm /h]
0
16
GB
D3209
(+15 °C, 1013 mbar)
Fig. 7
Fig. 8
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