PART I: SPECIFICATIONS
11
1.9 Checking the proper gas train size
1.10 Pressure in the Network / gas flow rate curves(natural gas)
To check the proper gas train size, it is necessary to the available
gas pressure value upstream the burner’s gas valve. Then subtract
the backpressure. The result is called
pgas.
Draw a vertical line
matching the furnace input value (600kW, in the example), quoted
on the x-axis, as far as intercepitng the network pressure curve,
according to the installed gas train (DN65, in the example). From the
interception point, draw an horizontal line as far as matching, on the
y-axis, the value of pressure necessary to get the requested furnace
input. This value must be lower or equal to the
pgas
value, calcula-
ted before.
GAS PRESSURE
IN
THE NETW
ORK
m
ba
r
RX75
Gas rate Stm
3
/h
RX75R
Gas rate Stm
3
/h
GAS
PRE
SSURE IN
THE NETWORK mbar
R75A M-..
Gas rate Stm
3
/h
WARNING: the diagrams refers to natural gas. For different type of fuel please refer to the paragraph “Fuel” at
the beginning of this chapter.
0
5
10
15
20
25
100
200
300
400
500
600
700
800
900
Potenza / Output (kW)
Minima pressione gas in
rete / Minimum inlet gas
pressure (mbar)
Rp 2" (50)
DN65
Power kW
min
imum gas
pressure in
th
e ne
tw
or
k m
bar
Summary of Contents for R75A
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