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NOTES ON USE OF
PROPANE (L.P.G.)
We think it would be useful to inform
you on a few points regarding use of
liquid propane gas (L.P.G.).
1) Approximate evaluation of run-
ning costs
a) 1 m
of liquid gas in gaseous
3
state has heating power infe-
rior by about 22.000 Kcal.
b) to obtain 1 m
of gas about
3
2 kg of liquid gas are requi-
red. This is equal to about
4 litres of liquid gas.
According to the above, it can
be deduced that by using liquid
gas (L.P.G.) the following appro-
ximate equivalence is obtained:
22.000 kcal = 1 m
(in gaseous
3
state) = 2 kg of L.P.G. (liquid)
= 4 litres L.P.G. (liquid).
From this, running costs can
be calculated.
2) Safety measures
Liquid gas (L.P.G.) has, in it
gaseous state, a specifi c gravity
superior to that of air (specifi c
gravity of propane gas in relation
to air = 1,56) and therefore does
not disperse in air like natural gas,
which has a lower specifi c gravity
(specifi c gravity of natural gas in
relation to air = 0,60), but precipi-
tates and spreads at ground level
as if it were a liquid. In view of the
above principle, the Ministero del-
l'Interno ( Home Offi ce) has set
limitations for use of Liquid Gas in
circular n° 412/4183 of 6 February
1975. We will look into the points
we think most important:
Minimum temperature
Tank 990 l.
Tank 3000 l.
Tank 5000 l.
a) Liquid Gas (L.P.G.) for burners
and/or boilers can only be
used in rooms above ground
and overlooking open spaces.
Installations using liquid gas in
Installations using liquid gas in
basements or cellars are not
permitted.
permitted.
b) Rooms where liquid gas is
used must have ventilation
inlets without closing devi-
ces, located on external wal-
ls with a surface of at least
1/15 of the room's area and a
minimum of 0,5 m
At least one third of the entire
surface of these inlets must
be located in the lower part
be located in the lower part
of the external wall, fl ush with
of the external wall, fl ush with
the fl oor.
appro-
3 ) Re q u ire me n t s f o r liq u id
gas plant to ensure correct
operation and safety
Natural gasifi cation, from cylinder
unit or tank, can only be used for
low power plant. Supply capacity
at gaseous stage, depending on
tank dimensions and minimum
external temperature, is shown
in the following table but only as
a rough guide.
a rough guide.
4) Burner
The burner must be ordered
specifically for use with liquid
gas (L.P.G.) so that it is equip-
ped with gas valves of suffi cient
dimensions to ensure correct
ignition and gradual regulation.
Our valves have dimension is
planned for use at a supply
pressure of about 300 mm.W.C.
We suggest gas pressure be
checked at the burner by using a
water column pressure gauge.
- 15 °C
- 10 °C
1,6 Kg/h
2,5 Kg/h
2,5 Kg/h
4,5 Kg/h
4 Kg/h
6,5 Kg/h
0006081117_2006/09
above ground
5) Combustion control
.
2
.
- 5 °C
3,5 Kg/h
6,5 Kg/h
11,5 Kg/h
43 / 75
N.B.
Maximum and minimum burner
pressure (kcal/h) obviously re-
mains that of the original natural
gas burner (L.P.G. has heating
power superior to that of natural
gas. Therefore, in order to burn
fully, it requires air quantity in
proportion to the thermal power
created).
To limit consumption and avoid
serious trouble, adjust combu-
stion by using the appropriate in-
struments. It is absolutely essen-
tial to check that the percentage
of carbon monoxide (CO) does
not exceed maximum permitted
value of 0,1 % (use a phial analy-
ser or other similar instrument).
Please note that our guarantee
does not cover burners operating
on liquid gas (L.P.G.) in plant for
which the above measures have
not been taken.
- 0 °C
+ 5 °C
8 Kg/h
10 Kg/h
9 Kg/h
12 Kg/h
16 Kg/h
21 Kg/h
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