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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
3
state has heating power inferior
by about 22.000 kcal.
b) to obtain 1 m
of gas about
3
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 liquid gas
(L.P.G.) the following approximate
equivalence is obtained:
22.000 kcal = 1 m
(in gaseous sta-
3
te) = 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
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:
a) Liquid Gas (L.P.G.) for burners
and/or boilers can only be used
in rooms above ground and
overlooking open spaces. In-
stallations using liquid gas in
basements or cellars are not
permitted.
Minimum
temperature
Tank 990 l.
Tank 3000 l.
Tank 5000 l.
NOTES ON USE OF PROPANE (L.P.G.)
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
external temperature, is shown in
the following table but only as a
rough guide.
4) Burner
The burner must be ordered specifi-
cally 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 plan-
ned 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.
N.B. Maximum and minimum bur-
ner pressure (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).
- 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
0006081054_200810
5) Combustion control
To limit consumption and avoid se-
rious trouble, adjust combustion by
using the appropriate instruments.
It is absolutely essential to check
.
2
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 cover burners
operating on liquid gas (L.P.G.) in
plant for which the above measures
have not been taken.
- 5 °C
3,5 Kg/h
6,5 Kg/h
11,5 Kg/h
60 / 112
- 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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