|
|
Welding Gases
Acetylene
| Air
| Argon
| Helium
Hydrogen | Nitrogen
| Oxygen
| Propane
Carbon
Dioxide (CO2)
Carbon
Dioxide (CO2) is a non-flammable, colorless, odorless gas
which exhibits an acidic taste. It is found in air at
concentrations of about 0.03%. Carbon dioxide may exist
simultaneously as a solid, liquid, and gas at a temperature of -69.9
degrees F (-56.6 degrees C) and a pressure of 60.4 psig (416 kPa).
At a temperature of -110 degrees F (-79 degrees C) and atmospheric
pressure, carbon dioxide solidifies forming "dry ice" at a
density of 97.4 pounds per cubic foot. Because of its low
concentration in the atmosphere, air is not a suitable feedstock for
carbon dioxide production. Rather, carbon dioxide is obtained for
by-product streams from various manufacturing processes, such as the
combustion of coal and natural gas. Bulk quantities of carbon
dioxide are usually stored and shipped as liquid under elevated pressure
and refrigeration.
Although
not truly inert, carbon dioxide is nonreactive with many materials and
is often used for inerting purposes, such as blanketing and purging of
tanks and reactors. Mixed with argon at various levels, carbon
dioxide is valuable as a shielding gas in the arc welding process.
In this application carbon dioxide is the best shielding gas because of
its high heat conductivity and its ability to oxidize ferrous metals.
Argon mixed with carbon dioxide usually increases penetration of the
weld in most metals.
Carbon
dioxide is also used as the source of bubbles in soft drinks and other
carbonated beverages. It is used to fill certain types of fire
extinguishers that rely on its inert properties, density, and low
temperature when released from high pressure storage. In addition
to its "inert" properties, carbon dioxide as dry ice is used
to freeze a variety of foods.
| DOT
Information |
|
| DOT
Name: |
|
Carbon
Dioxide, Liquefied |
| DOT
Hazard Class: |
|
Nonflammable
Gas |
| DOT
Label: |
|
Nonflammable
Gas |
| DOT
ID No.: |
|
UN1013 |
| CAS
No.: |
|
624-64-6 |
| Valve
Outlet: |
|
CGA 320,
CGA 960 Pin-indexed |
| |
| Physical
State in High Pressure Cylinder: Liquid under own vapor
pressure |
| Fire
Potential: |
|
Non-Flammable |
| Major
Hazards: |
|
Asphyxiant,
High Pressure Inhalation |
| |
|
Physical
Properties of Carbon Dioxide |
| Formula: |
|
CO2 |
| Molecular
Weight: |
|
44.01
lb/mol |
| Specific
Volume at 70°F and 1 atm: |
|
8.74
ft3/lb (0.42 m3/kg) |
| Specific
Heat: |
|
8.92
BTU/lbmol-deg F@ 70 deg. F |
| Specific
Gravity: |
|
1.555 |
| Gas
Density: |
|
.1144
lb/ ft3 @ 70 deg. F. 14.7 PSIA |
| Psat
@ 70 deg F: |
|
852.8
psia |
| Liquid
Density @ 70 deg F: |
|
47.64
lb/ft3 |
|
| Boiling
Point |
| Temperature: |
|
-109.2
deg. F (-79 deg. C) |
|
|
Critical Point |
| Temperature: |
|
87.9 deg. F |
| Pressure: |
|
1070.6
PSIA |
|
| Triple
Point |
| Temperature: |
|
-69.9
deg. F |
| Pressure: |
|
75.13
PSIA |
|
|
PACKAGING
CYLINDER SIZE
|
APPROXIMATE
WEIGHT OF FULL CYLINDER (LBS.)
|
PRESSURE
(PSI @ 70F)
|
DIMENSIONS
(Height x Diameter)
|
|
20
lbs.
|
45
|
400
|
27"
x 8"
|
|
50
lbs.
|
160
|
400
|
56"
x 9"
|
|
SERVICE
IS OUR MAIN ITEM . . . AND WE ARE NEVER OUT OF STOCK!
Havard Welding
713-672-1743 1601 Clinton Galena Park, Texas
77547
|
|
MANUFACTURER
WEBSITES
|
