What you need to know about Welding
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Welding Cylinder Data (capacity is in cubic feet @ 2100 psi)
Oxygen / Argon / Helium / Other High Pressure
Tank Designator Capacity Height Dia. (height w/o cap &
valve)
K 251
51" 9"
S 156
46" 7 3/8" ;; always owner cylinders
M 125
47" 7"
Q 92
30" 7 1/8" ;; always owner cylinders
R 20
14" 5 1/4"
Acetylene
Tank Designator Capacity Height
Dia.
#5 350
45" 12"
#4 150
38" 8"
#3 75
29" 7"
| Normal Dimensions |
| Model |
DOT Spec |
Tapping |
ID
(in) |
OD
(in) |
Length
(in) |
Weight
(lbs) |
Water Volume (cu in) |
Service Pressure (psi) |
Test Pressure (psi) |
| 20 cf |
3AA2015 |
3/4-14
NGT |
5.013 |
5.263 |
13.750 |
10.5 |
220 |
2015 |
3360 |
| 40 cf |
3AA2015 |
3/4-14
NGT |
6.670 |
7.000 |
17.400 |
23.5 |
490 |
2015 |
3360 |
| 55 cf |
3AA2015 |
3/4-14
NGT |
6.670 |
7.000 |
22.625 |
29.0 |
670 |
2015 |
3360 |
| 80 cf |
3AA2015 |
3/4-14
NGT |
6.626 |
7.000 |
32.375 |
46.5 |
1010 |
2015 |
3360 |
| 122 cf |
3AA2015 |
3/4-14
NGT |
6.626 |
7.000 |
43.000 |
58.0 |
1360 |
2015 |
3360 |
| 125 cf |
3AA2265 |
3/4-14
NGT |
6.626 |
7.000 |
43.000 |
58.0 |
1360 |
2265 |
3775 |
| 150 cf |
3AA2015+ |
3/4-14
NGT |
7.045 |
7.375 |
46.563 |
61.0 |
1660 |
2015 |
3360 |
| 224 cf |
3AA2015 |
3/4-14
NGT |
8.500 |
9.000 |
51.000 |
113.0 |
2640 |
2015 |
3360 |
| 277 cf |
3AA2265 |
3/4-14
NGT |
8.500 |
9.000 |
51.000 |
117.0 |
2640 |
2265 |
3775 |
| 300 cf |
3AA2400 |
3/4-14
NGT |
8.750 |
9.250 |
55.000 |
139.0 |
2990 |
2400 |
4000 |
|
Cylinder Sizes
BACKGROUND
The use of gas welding dates back to the middle 1800's where a mixture
of Oxygen And Hydrogen were used to produce a hot flame that was used in the
making of jewelry. It wasn't until the late 1890's when the gas Acetylene became
available that gas welding developed into the process that we know today.
Acetylene is a gas that is manufactured by mixing Calcium Carbide,( a by product
of the electric furnace steel making process) with water. Acetylene when burned
alone can produce a flame temperature of about 4000 deg. F. With the addition of
Oxygen a flame temperature in excess of 6000 deg. F. can be achieved, making
Acetylene ideal for welding and cutting. An Oxy-Acetylene outfit is portable,
less expensive and more versatile than a electric welding set up. By using the
proper tips, rods and fluxes, almost any metal can be welded, heated or cut
using the Oxy-Acetylene process.
There are many components that make up the Oxy-Acetylene outfit such as
cylinders, regulators, hoses etc. The following is a typical outfit listing each
component with a brief description of each.
CYLINDERS
Oxygen and Acetylene are stored under pressure in steel cylinders .
They are sized by the cuft. of either Oxygen or Acetylene that they hold.
Cylinders should be tested regularly with the date of the last test stamped
on the top of the cylinder. Cylinders should always be secured and used in the
upright position. When a cylinder is not being used, the valve cap should always
be in place.
OXYGEN CYLINDERS
These cylinders are made of steel and are usually painted green. They
range in size from less than 20 cuft. To over 300 cuft and contain compressed
Oxygen at pressures that can be as high as 2200 psig. All cylinders have valves
and ( except the small "R" tank ) are fitted with a screw on steel cap that
protects the cylinder valve when the cylinder is not in use. If Oxygen comes
into contact with oil or grease, it will burst into flame. Never use oil or
grease on Oxygen cylinder valves or regulators. Make sure hands and gloves are
free of oil and grease before handling cylinders. Crack open the cylinder valve
then close it before installing the regulator to clear the valve of any dirt.
With the regulator installed, always crack the cylinder valve open first, then
open it fully. This will lessen the chance of recompression which is caused by
high cylinder pressure entering the regulator, heating up and damaging the
regulator.
ACETYLENE CYLINDERS
These cylinders contain Acetylene under pressure, are painted black, (
small "B" and "MC" tanks can be gray, silver or red ) made of steel and have
cylinder valves. They range in size from 10 to almost 400 cuft capacity. The
cylinders contain a porous filler material which is wetted with acetone that
allows the Acetylene to safely be contained in the cylinder at 250 psig. Always
use an Acetylene cylinder in the up right position so you don't draw any of the
acetone out of the tank. Only open the cylinder valve 1 to 1 1/2 turns, leaving
the valve wrench on the valve in the event it has to be shut off quickly.
Acetylene should never be used at a pressure that exceeds 15 psig as it becomes
highly unstable which, depending on the condition, could cause it to decompose
and explode. As with the Oxygen cylinder, make sure the cylinder valve is clean
before installing the regulator.
With the pressure in a full Acetylene cylinder at 250 psig and a full Oxygen
cylinder at 2200 psig, a way is needed to lower these cylinder pressures to
desired working pressures for use in the torch. This is accomplished by using an
adjustable pressure reducing regulator. The regulator will also maintain a
steady working pressure as the cylinder pressure drops from use.
