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ENGLISH
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 running costs
a)
1 m
3
of liquid gas in gaseous state has heating power
inferior by about 22.000 Kcal.
b)
to obtain 1 m
3
of gas 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 liquid
gas (L.P.G.) the following approximate equivalence is obtained:
22.000 kcal = 1 m
3
(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 propane 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. 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
2
.
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 specifically for use with liquid gas
(L.P.G.) so that it is equipped with gas valves of sufficient dimen-
sions to ensure correct ignition and gradual regulation.
Our valves have dimension is planned for use at a supply pres-
sure 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 burner pressure (kcal/h) obviously
remains that of the original natural gas burner (L.P.G. has he-
ating power superior to that of natural gas. Therefore, in order
to burn fully, it requires air quantity in proportion to the thermal
power created).
5) Combustion control
To limit consumption and avoid serious trouble, adjust combustion
by using the appropriate instruments.
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 cover burners operating on
liquid gas (L.P.G.) in plant for which the above measures have
not been taken.
Minimum
temperature
- 15 °C
- 10 °C
- 5 °C
- 0 °C
+ 5 °C
Tank 990 l.
1,6 Kg/h
2,5 Kg/h
3,5 Kg/h
8 Kg/h
10 Kg/h
Tank 3000 l.
2,5 Kg/h
4,5 Kg/h
6,5 Kg/h
9 Kg/h
12 Kg/h
Tank 5000 l.
4 Kg/h
6,5 Kg/h
11,5 Kg/h
16 Kg/h
21 Kg/h
Summary of Contents for COMIST 180
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