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AA-6800/6650 Instruction
High pressure gas must be handled carefully observing the legal regulation.
Not only to the following precautions, refer to regulations and laws regarding to handle the high pressure gas.
Cautionary items in this manual should be read carefully.
1. Installation of gas cylinder
(1) Install the gas cylinders in the airy outdoors where they are not exposed to direct sunlight.
(2) Take care that gas cylinders become no hotter than 40 qC, and do not allow any flame within 2 meters
of the gas cylinders.
(3) Secure gas cylinders so that they cannot drop or fall over. Always keep liquefied gas cylinders
(acetylene, nitrous oxide, etc.) in a vertical position and do not allow them to fall to a horizontal
position.
2. Acetylene gas
(1) When using acetylene gas, please use a pressure reduction valve especially made for use with
acetylene gas. Do not allow acetylene to flow through pipes, and do not use equipment made from
copper, silver, mercury, or their alloys in order to prevent the formation of metal-acetylides.
Decomposition of such compounds could result in a "decomposition explosion" resulting from a shock.
(2) The acetylene gas cylinder contains solvents such as acetone. If the primary pressure reduced below
0.5 MPa, it should be replaced with a new cylinder in order to prevent the outflow of solvents.
3. Oxygen gas
Do not use oxygen gas.
4. Air
Supply the dry air. If air containing much moisture is used, the moisture may adhere to the inside of the gas
controller and prevent normal operation. Dehumidity with a drain separator provided on the way of piping
from the air supply source.
5. After use of gas
After the gas was used, be sure to close the main valve as well as the stop valve.
6. Pressure gauge
Periodically inspect the pressure gauge to maintain its normal function.
Precautions on Handling High Pressure Gas
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