Emerson Rosemount OCX 8800 Reference Manual page 280

Safety data
Emerson recommends that you wear full body clothing to reduce the potential for skin
irritation. Use washable or disposable clothing. Do not take unwashed work clothing
home. Wash work clothes separately from other clothing. Rinse washing machine
thoroughly after use. If clothing is to be laundered by someone else, inform launderer of
proper procedure. Keep work clothes and street clothes separate to prevent
contamination. Product which has been in service at elevated temperatures (greater than
982 °C (1800 °F)) may undergo partial conversion to cristobalite, a form of crystalline silica.
This reaction occurs at the furnace lining hot face. As a consequence, this material
becomes more friable; take special caution to minimize generation of air-borne dust. The
amount of cristabolite present depends on the temperature and length in service.
IARC has recently reviewed the animal, human, and other relevant experimental data on
silica in order to critically evaluate and classify the cancer causing potential. Based on its
review, IARC classified crystalline silica as a group 2A carcinogen (probable human
carcinogen).
The OSHA permissible exposure limit (PEL) for cristobalite is 0.05 mg/m
The ACGIH threshold limit value (TLV) for cristobalite is 0.05 mg/m
(ACGIH 1991-92). Use NIOSH or MSHA approved equipment when airborne exposure
limits may be exceeded. The minimum respiratory protection recommended for given
airborne filter or cristobalite concentrations are:
Table A-2:
Concentration
0-1 fiber/cc or 0-0.05 mg/m
OSHA PEL)
Up to 5 fibers/cc or up to 10 times the OSHA PEL
for cristabolite
Up to 25 fibers/cc or 50 times the OSHA PEL for
cristobalite (2.5 mg/m
Greater than 25 fibers/cc or 50 times the OSHA
PEL for cristobalite (2.5 mg/m
If airborne fiber or cristobalite concentrations are not known, as minimum protection, use
NIOSH/MSHA approved half face, air purifying respirator with HEPA filter cartridges. Spray
insulation surface lightly with water before removal to suppress airborne dust. As water
evaporates during removal, spray additional water on surfaces as needed. Only spray
enough water to suppress dust so that water does not run onto the floor of the work area.
To aid the wetting process, use a surfactant.
270
Concentration
3
cristabolite (the
3
)
3
).
3
(respirable dust)
Personal protective equipment
Optional disposable dust respirator (e.g., 3M
9970 or equivalent)
Half face, air purifying respirator equipped with
high effiency particulate air (HEPA) filter car-
tridges (e.g., 3M 6000 series with 2040 filter or
equivalent).
Full face, air purifying respirator with high par-
ticulate effiency particulate air (HEPA) filter car-
tidges (e.g., 3M 7800S with 7255 filters or
equivalent) or powered air purifying respirator
(PARR) equipped with HEPA filter cartridges
(e.g., 3M W32655 with W3267 filters or equiva-
lent).
Full face, positive pressure supplied air respira-
tor (e.g., 3M 7800S with W9435 hose & W3196
low pressure regulator kit connected to clean air
supply or equivalent).
3
(respirable dust).
OCX 8800