Gas Train; Gas Train Installation; Gas Pressure - Riello RLS 190/M MZ Installation, Use And Maintenance Instructions

5.9.2

Gas train

Type-approved in accordance with EN 676 and supplied
separately from the burner.
To select the correct gas train model, refer to the manual "Burner-
gas train combination" supplied with the unit.
5.9.3

Gas train installation

Disconnect the electrical power supply using the
system main switch.
DANGER
Check that there are no gas leaks.
Pay attention when handling the train: danger of
crushing of limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
The operator must use the required equipment
during installation.
5.9.4

Gas pressure

The adjacent Tab. J indicates the minimum pressure drops along
the gas supply line, depending on the maximum burner output.
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 27), with:
• combustion chamber at 0 mbar;
• combustion head adjusted as in the diagram.
20164195
Installation
kW
1100
1217
1333
1450
1567
1683
1800
1917
2033
2150
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)(Fig. 27);
– find in Tab. J the pressure value closest to the result of the
subtraction.
Read the corresponding output on the left.
Example:
Maximum output operation
Natural gas G 20 NCV 10 kWh/Nm
Gas pressure at test point 1)(Fig. 27)
Pressure in combustion chamber
A pressure of 18.9 mbar corresponds in Tab. J to an output of
1800 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To calculate the required gas pressure at test point 1) (Fig. 27),
set the maximum output required from the burner operation:
Find in Tab. J the output value closest to the desired value.
Read, on the right, the pressure at test point 1)(Fig. 27).
Add this value to the estimated pressure in combustion chamber.
Example:
Required burner maximum output operation: 1800 kW
D3177
Natural gas G 20 NCV 10 kWh/Nm
Gas pressure at an output of 1800 kW,
from Tab. J
Pressure in combustion chamber
pressure required at test point 1)(Fig. 27).
Data of head thermal power and gas pressure
Fig. 27
refer to operation with gas butterfly valve fully
open (90°).
ATTENTION
22 GB
p (mbar)
G20 G25
8.2 12.3
9.9 14.8
11.6 17.3
13.4 20
15.2 22.7
17 25.4
18.9 28.2
20.9 31.1
22.9 34.1
24.9 37.1
3
=
=
21.9 - 3 =
3
=
=
18,9 + 3 =
G31
10.9
13.1
15.4
17.8
20.2
22.6
25.1
27.7
30.3
33
Tab. J
21.9 mbar
3 mbar
18.9 mbar
18.9 mbar
3 mbar
21.9 mbar