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AC/OX CUTTING/WELDING/BRAZING OXYGEN Product name
Formula
Oxygen
Hazard class
O2
Nonflammable gas
Appearance and colour
IMDG code
Colourless, odourless, tasteless gas
2.2 + 5.1
Specific gravity (Air=1)
Substance Identification
1.11 (Slightly heavier than air)
UN-1072
Cylinder characteristics Colour code: Body – Blue Cylinder Outlet Size Connection
Nominal Filled Pressure Nominal Approx.
Approx.
Contents (bar) at 15ºC Wt. Of Gas Dimensions Cylinder Wt.
(cu. Metres) (max) (kg) (mm) (kg) (See note 1.)
(See note 1.) (See note 2.) (See note 3.)
0-5
W21.80mm x 1/14”
1
200
1.3
140 x 620
12
0-40
W21.80mm x 1/14”
6.4
150
7.8
230 x 1360
52
Note:
1. Actual contents and weight of gas in individual cylinders will vary about the nominal contents and weight of gas indicated.
2. The length includes an allowance of 70mm for a top outlet valve. 3. The approximate cylinder weight includes cylinder, valve and neck-ring. The approximate weight of a full cylinder is obtained by adding the nominal weight of contained gas to this figure. Greater weights may be found among cylinders manufactured to older standards.
OXYGEN
Oxygen (02) is a colourless, odourless gas, slightly heavier than air. Oxygen normally amounts to 21% by volume of the earth’s atmosphere at sea level. Oxygen is produced industrially by rectification (distillation) of liquid air, from which the Oxygen boils off at minus 183 °C, and can thus be separated from the other air gases, for compression in steel cylinders. Oxygen itself will not burn, but the gas sustains combustion in the normal sense of the word. In pure oxygen combustion proceeds much more rapidly than in air, and the higher the pressure, the more violent the combustion. Even materials that are normally not combustible, or are difficult to ignite, can catch fire spontaneously or be set alight in pure Oxygen. We make use of this phenomenon for the Oxygen-cutting of steel.
5.02
522
Oxygen can lead to the explosive ignition of ordinary oil, grease or other organic substances. For this reason a welder must never wear working clothes or use equipment that is contaminated with oil or grease. Be particularly careful to prevent equipment or fittings for Oxygen to come in contact with oil or grease. Only special lubricants may be used for Oxygen equipment.