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0006081529_201201
ENGLISH
NOTES ON USE OF PROPANE (L.P.G.)
We wish to inform you of a number of considerations regarding the
use of liquid propane gas (L.P.G.).
1) Approximate assessment of operating cost
a) 1 m
3
of liquid gas in gaseous form has less calorific power,
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.
This reveals that the use of liquid gas (L.P.G.) yields approximately
the following equivalence: 22.000 kcal = 1 m
3
(in gaseous form) =
2 kg of L.P.G. (liquid) = 4 l L.P.G. (liquid) from which the operating
cost can be assessed.
2) Safety regulations
Liquid propane gas (L.P.G.) in the gaseous form has a greater
specific weight than air (specific weight relative to air = 1.56 for
propane), which means it does not disperse in air like natural gas,
which has a lower specific weight than air (specific weight of natural
gas relative to air = 0.60), but precipitates and spreads out at ground
level (as if it were a liquid). Taking into account the principle described
above, the Italian Ministry of the Interior set limits on the use of liquid
propane gas in memorandum no. 412/4183 dated February 6 1975,
of which we sum up the most important concepts below.
a) Liquid propane gas (L.P.G.) burners and/or boilers may be used
only in premises located above ground level and certified toward free
spaces. Installations using liquid propane gas may not be installed
in underground or semi-underground premises.
b) Premises where liquid propane gas is used must have ventilation
openings which cannot be closed on their outside walls with a
surface area measuring at least 1/15 the surface area of the room,
with a minimum of 0.5 m
2
. At least one third of the entire area 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 a cylinder bank or tank, can be used only
for systems having low power.
Gas supply capacity in gaseous form on the basis of tank size
and minimum outdoor temperature are shown, as an approximate
indication only in the table below.
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
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 dimensions
to ensure correct ignition and gradual adjustment.
The valve dimension is foreseen by us for a supply pressure of
approximately 300 mm W.C. . We recommend that you check the
burner gas pressure using a water column pressure gauge.
!
Maximum and minimum burner power (Kcal/h) is, of
course, the same as for the original natural gas burner
(L.P.G. has greater heating capacity than natural gas,
which means that to burn completely, it requires a
quantity of air proportionate to the heating power
produced).
5) Controlling combustion
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 the maximum permitted value of
0,1 % (use a phial analyser or other similar instrument).
The warranty will not cover burners burning liquid propane gas
(L.P.G.) in installations in which these measures have not been
applied.