baltur BTG 3.6 P Notice D'instructions page 39

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 m3 of liquid gas in gaseous state has heating power
inferior by about 22,000 kcal.
b) to obtain 1 m3 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 m3 (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 ven-
tilation 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 m2.
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.
Minimum
temperature
Tank 990 l.
Tank 3000 l.
Tank 5000 l.
- 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
0006080763_201008
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
dimensions to ensure correct ignition 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.
!
Maximum and minimum burner 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).
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 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 measures
have not been taken.
- 5 °C
3.5 kg/h
6.5 kg/h
11.5 kg/h
17 / 20
- 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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