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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 run-
ning 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
about 2 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
lquid 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
natural 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 Mini-
stero 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.
1,6 kg/h
Tank 3000 l.
2,5 kg/h
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
of gas
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 ope-
ration 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 ordered
specifically for use with liquid
gas (L.P.G.) so that it is equipped
with gas valves of sufficient di-
mensions to ensure correct igni-
tion 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
2,5 kg/h
4,5 kg/h
4 kg/h
6,5 kg/h
0006080480_200710
5) Combustion control
.
2
- 5 °C
3,5 kg/h
6,5 kg/h
11,5 kg/h
6 / 6
N.B. Maximum and minimum
burner pressure (kcal/h) obviou-
sly 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
c o m b u s t i o n b y u s i n g t h e
a p p r o p r i a t e i n s t r u m e n t s .
It is absolutely essential to check
that the percentage of carbon
monoxide (CO) does not exceed
maximum permitted value of 0,1
% (use a phial analyser or other
similar instrument). Please note
that our guarantee does not co-
ver 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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