Hypertherm Shape Cutting Control - Manual (Page 10)

4 Safety
The plasma arc by itself is the heat source used for
cutting. Accordingly, although the plasma arc has not
been identified as a source of toxic fumes, the
material being cut can be a source of toxic fumes or
gases that deplete oxygen.
Fumes produced vary depending on the metal that is
cut. Metals that may release toxic fumes include, but
are not limited to, stainless steel, carbon steel, zinc
(galvanized), and copper.
In some cases, the metal may be coated with a
substance that could release toxic fumes. Toxic
coatings include, but are not limited to, lead (in some
paints), cadmium (in some paints and fillers), and
beryllium.
Gases produced by plasma cutting vary based on the
material to be cut and the method of cutting, but may
include ozone, oxides of nitrogen, hexavalent
chromium, hydrogen, and other substances if such
are contained in or released by the material being cut.
Caution should be taken to minimize exposure to
fumes produced by any industrial process. Depending
upon the chemical composition and concentration of
the fumes (as well as other factors, such as
ventilation), there may be a risk of physical illness,
such as birth defects or cancer.
It is the responsibility of the equipment and site owner
to test the air quality in the area where the equipment
is used and to ensure that the air quality in the
workplace meets all local and national standards
and regulations.
TOXIC FUMES CAN CAUSE INJURY OR DEATH
The air quality level in any relevant workplace
depends on site-specific variables such as:
• Table design (wet, dry, underwater).
• Material composition, surface finish, and
composition of coatings.
• Volume of material removed.
• Duration of cutting or gouging.
• Size, air volume, ventilation and filtration of the
work area.
• Personal protective equipment.
• Number of welding and cutting systems in
operation.
• Other site processes that may produce fumes.
If the workplace must conform to national or local
regulations, only monitoring or testing done at the site
can determine whether the site is above or below
allowable levels.
To reduce the risk of exposure to fumes:
• Remove all coatings and solvents from the metal
before cutting.
• Use local exhaust ventilation to remove fumes from
the air.
• Do not inhale fumes. Wear an air-supplied
respirator when cutting any metal coated with,
containing, or suspected to contain toxic elements.
• Assure that those using welding or cutting
equipment, as well as air-supplied respiration
devices, are qualified and trained in the proper use
of such equipment.
• Never cut containers with potentially toxic materials
inside. Empty and properly clean the container first.
• Monitor or test the air quality at the site as needed.
• Consult with a local expert to implement a site plan
to ensure safe air quality.