Steven Lee on tue 22 oct 02
Again in my research about kiln construction I came=20
across this page which gives a little more description
of Propane and its physical properties.
Hope this helps some of you out there!!!
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http://www.ilpga.org/cons_props.asp
Chemical Name: Propane=09
Chemical family: Paraffinic Hydrocarbon=09
Formula: C3H8=09
Synonyms: Dimethylmethane, LP-Gas,=20
Liquefied Petroleum Gas
(LPG),=20
Propane, Propyl Hydride=09
Propane can be composed of the following ingredients:
Propane 87.5 to 100%=09
Ethane 0 to 5%=09
Propylene 0 to 10%=09
Various Butanes 0 to 2.5%=09
Ethyl Mercaptan* 16 to 25 ppm
=09
*Propane gas is colorless, tasteless and odorless. Ethyl=20
Mercaptan is an odorizing agent added to propane so that=20
leaks may be detected by smell.
Flash Point: -156=B0 F (-104=B0 C)=09
Auto Ignition: 842=B0 F ( 432=B0 C)=09
Ignition temperature in air: 920-1120=B0 F=09
Flammable limits in air by volume: Lower =3D 2.15%=20
-- Upper =3D 9.6%=09
Maximum flame temperature in air 3,595=B0=09
=09
Boiling Point: (@ 14.7 psia
-44=B0 F=09
Specific Gravity of Vapor (air =3D 1) 1.5 (at 60=B0 F)=09
Specific Gravity of Liquid (water =3D 1) .504 (at 60=B0 F)=09
Vapor Pressure: @ 70=B0 F =3D=20
127 psig=09
@ 105=B0 F =3D=20
210 psig=09
Expansion Ratio (from liquid to gas @ 14.7 psia):=09
1 to 270
=09
One cubic foot of propane liquid will boil off into approximately 270 =
cubic
feet of vapor. As a result, a leak in any propane container, large or =
small,
can easily lead to a flammable mixture of propane and air.
The release of propane as a vapor or a liquid causes no adverse =
ecological
effects. It does not contain any Class I or Class II ozone-depleting
chemicals (40 CFR Part 82) and it is not listed as a marine pollutant =
by DOT
(49 CFR Part 171). Propane gas, however, displaces oxygen in the air. =
If the
ratio of propane to oxygen is high enough, it can cause asphyxiation.=20
BTU Per Gallon 91,502=09
BTU Per Cubic Foot 2,488=09
BTU Per Pound 21,548=09
=09
Pounds per gallon 4.20=09
Cubic Feet Per Gallon 36.38=09
Cubic Feet Per Pound 8.66=09
Propane gas is stored and handled as a liquid when under pressure =
inside an
LP-gas container. It vaporizes, changing from a liquid to a vapor when
released to the atmosphere at a temperature above -44=B0 F.=20
When released into the atmosphere, the gas condenses moisture from the =
air
and thus appears as a white cloud or fog at the point of discharge. The
outer edge of this white fog is flammable and will flash if brought in
contact with a source of ignition.
LP-gas inside a container is in two states of matter, liquid and vapor. =
The
liquid portion of a container is in the bottom area and the vapor is in =
the
upper area above the liquid. Containers are normally filled to only 80% =
to
allow for vapor expansion due to temperature increase.
Vapor pressure of propane increases as the liquid temperature =
increases.
Propane at -44=B0 F inside a container would register zero pressure. At =
32=B0 F,
the pressure would increase to 54 psig and at 100=B0 F the pressure =
would be
205 psig.
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Steven D. Lee
SD Pottery - The Little Texas Pottery
http://www.sdpottery.com
millenial_age@yahoo.com
14341 FM 112
Thrall, TX 76578
512-898-5195
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