Electric-arc bums on cylinders are potentially dangerous.
The arc-bum causes higher stresses and might lead to cylinder rupture. Arc-bums
can be caused by arc current passing through a grounded cylinder. They can happen
quickly, and in a number of ways. The basic thing to remember is to keep the
torch, arc, and any source of current away from compressed gas cylinders. With
a little care while operating, arc-bum damage to cylinders can be eliminated by
the following these precautionary steps.
Never strike an arc on a cylinder. When you want to
test the system operation, use a piece of grounded scrap metal.
Be sure that shielding-gas cylinders are never grounded.
Cylinders, fittings, and supports should be electrically insulated from
metallic building structures or fixtures to which they are secured.
Do not fasten cylinders to work tables and fixtures.
They may become part of the work circuit. Use insulating shields to electrically
isolate cylinders that cannot be removed.
Be careful of where and how the work is grounded so
that the ground connections will never touch the cylinder.
Do not hang the torch or any electrode holder on the
cylinder. Use a nearby hook; not the regulator or flow meter. This will help
keep arcs away from the cylinder at all times.
Remove empty cylinders from working areas. Return
them to a designated storage area as soon as possible.
Make sure all electrical wiring is in good condition.
Repair or replace defective, frayed or exposed sections immediately.
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