Rinnai aiM 115, User And Installation Manual

Page: 29 / 66

25
Gas supply
Sealed sheath
Shut-off valve
Anti-vibration joint
Shut-off valve
Fuel shut-off valve
Requirements and conditions
Gas supply circuit
The gas supply system must be sized for the required flow rate and it must be equipped with
the safety and control devices prescribed by the regulations in force.
In the presence of very long supply networks, it is necessary to contain the pressure drops
and speed in accordance with the provisions of current legislation, in order to avoid the
malfunction of the heat generator burner.
For a correct functioning it is necessary that the static and dynamic pressure of the gas
methane are not lower than 21mbar and 18mbar respectively. In case of higher values, yes
recommends the installation of a suitable pressure reducer.
Indicative diagram of methane gas
Methane gas pipe sizing table
The table is provided for the empirical estimate of the diameter of the pipe, as a function of the equivalent length of the pipe and
installed power.
Installed power Methane gas flow Gas meter type Maximum equivalent piping lengths (meters)
kW m
3
/h 3/4" 1" 1" 1/4 1" 1/2 2" 2" 1/2 3” 3” 1/2
65 6.82 G6 8 20 80 150 - - - -
85 8.91 G6 5 15 50 100 - - - -
115 12.06 G10 - 8 30 60 200 - - -
130 13.63 G10 - 6 25 50 150 - - -
150 15.73 G10 - 5 20 40 120 - - -
170 17.83 G16 - - 15 30 100 - - -
195 20.45 G16 - - 12 25 80 250 - -
230 24.12 G16 - - 8 15 60 200 - -
255 26.74 G25 - - 6 12 50 180 - -
260 27.27 G25 - - 6 12 45 180 - -
340 35.66 G25 - - - 8 30 100 225 -
345 36.18 G25 - - - 8 30 100 225 -
450 47.20 G40 - - - 5 15 60 120 250
460 48.24 G40 - - - 5 15 60 120 250
600 62.93 G40 - - - - 10 35 80 150
The table is purely indicative and simplified, therefore it does not constitute any commitment or responsibility on the part of Rinnai Italia, nor does it intend to replace
the work of the plumbing and heating designer where intervention is required.