Liquid Petroleum Gas or LPG is a general naming that refers to liquefied
gaseous fuels mainly consisted of saturated
hydrocarbons (CvH2v+2) with three or four atoms of carbon (v=3 êáé v=4).
Such hydrocarbons are products of petroleum
refining and under usual temperatures and
pressures of environment exist in a gas phase.
With a small though pressure increase or
light cooling they got liquefied and occupy
a very small volume (just 1/250 of the volume of the gas phase). Therefore, the LPG, in its various forms,
is storied and delivered mainly in a liquid
and not gas phase.
The LPG storage is made in suitable containers
(tanks, bottles) either under a mean pressure in environmental
temperature or a lower pressure but in a
lower though temperature. The liquefaction
and storage of LPG is indeed possible even
under an atmospheric pressure but in a sufficiently
In a gas phase, LPG bears characteristics
that look like those of natural gas. In a
liquid phase it looks like benzene as to
transfer mode, storage and measuring with
a basic though difference that in order to
be preserved in a liquid condition it must
be under pressure. In a usual however utility the container
that contains LPG, viz. the phial or tank
contains gas too.
The special gravity of LPG is approximately
the half of water, and LPG’s vapours (gas phase) are heavier that air’s and therefore, in
a free condition, they run into ground and
drainages, accumulated to lower points.
LPG, besides the other fuels, get burned
in a gas phase, in temperatures higher than
the flash point, viz. in that temperature that the fuel
has to reach to evaporate plenty quantity
and have an ignition in the presence of a
flame. In an environmental temperature however
that is higher than the flash point, enough
quantity of LPG is gasificated for the initial
feeding of the flame, and with a temperature
from a combustion, additional gas or vapour
is produced from the liquid fuel.