Standard Operating Procedure for Chemical Handling and Storage
EHS-00005 R12
Printed copies are considered uncontrolled. Verify revision prior to use.
DCN1216
CNSE Confidential
Page 26 of 43
18.1.4
Minimum hood face capture velocity shall be 100 fpm and for wet
benches, sinks and hoods which utilize slots in the freeboard
area above
the liquid level of the bath shall have minimum slot velocities of 750 fpm
and a minimum
capture velocity, i.e. 9" above the liquid level
at the center
of the chemical bath, of 125 fpm.
18.2
Flammable/Combustible Solvent Work Station Design
18.2.1
All metal (18 gauge stainless steel minimum) construction, or
Factory
Mutual Flame retardant plastic meeting 4910 performance standard.
18.2.2
Point of use (in station or directly above)
extinguishing system, either
water or Halon/CO
2
system. If Halon/CO
2
system, both manual and
automatic, utilizing UV/IR detectors (not powered by the emergency off
switch).
18.2.3
Means for electrically grounding the hood or work
station to prevent static
accumulation.
18.2.4
Electrical equipment & wiring, including lighting inside the hood, shall be
rated for flammable atmospheres, Class I, Division II; or
shall be located in
a separate nitrogen-purged area of the work station. The nitrogen purge
must have a flow indicator.
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