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NOTES ON USE OF PRO-
PANE (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
running costs
a) 1 m
of liquid gas in gaseous
state has heating power infe-
rior by about 22.000 kcal.
b) to obtain 1 m
of gas about
kg of liquid gas are required.
This is equal to about 4 litres
of liquid gas.
According to the above, it can
be deduced that by using li-
quid gas (L.P.G.) the following
approximate equivalence is
obtained:
22.000 kcal = 1 m
(in gaseous
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 specific gravity superior to
that of air (specific gravity of propa-
ne gas in relation to air = 1,56) and
therefore does not disperse in air
like natural gas, which has a lower
specific gravity (specific gravity of na-
tural gas in relation to air = 0,60), but
precipitates and spreads at ground
level as if it were a liquid. In view of
the above principle, the Ministero
dell'Interno ( Home Office) 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 bur-
ners and/or boilers can only be
used in rooms above ground
and overlooking open spaces.
Installations using liquid gas
in basements or cellars are
not permitted.
b) Rooms where liquid gas is
used must have ventilation
inlets without closing devices,
located on external walls 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
of the external wall, flush with
the floor.
3) Requirements for liquid gas
plant to ensure correct operation
and safety
Natural gasification, from cylinder
unit or tank, can only be used for
low power plant. Supply capacity
at gaseous stage, depending on
tank dimensions and minimum ex-
ternal temperature, is shown in the
following table but only as a rough
guide.
4) Burner
The burner must be orde-
red specifically for use with
liquid gas (L.P.G.) so that it
is equipped with gas valves
of sufficient dimensions to
ensure correct ignition and
gradual regulation.
Our valves have dimension
is planned for use at a supply
pressure of about
- 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
0006080479_00710
.
5) Combustion control
- 5 °C
3,5 kg/h
6,5 kg/h
11,5 kg/h
7 / 66
300 mm.W.C. We suggest
gas pressure be checked at
the burner by using a water
column pressure gauge.
N.B. Maximum and minimum
burner p ressure ( kcal/h)
obviously remains 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
combustion by using the ap-
propriate instruments.
It is absolutely essential to
check that the percentage of
carbon monoxide (CO) does
not exceed maximum permit-
ted value of 0,1 % (use the
combustion analyser). Please
note that our guarantee does
not cover burners operating
on liquid gas (L.P.G.) in plant
for which the above measu-
res 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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