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DOE-HDBK-1132-99
Process vessels that could contain uranium should vent to the process
off-gas system, which in turn should pass through pretreatment, if
needed, and HEPA filtration.
Three types of metallurgical processes require special ventilation
considerations:
Processes that use volatile or easily entrained organic liquids should
have a ventilation system that provides sufficient air movement around
the process area to prevent exposure of personnel to the hazardous
liquid or vapor. The design should incorporate roughing filters and/or
other types of traps to remove entrained organic liquid droplets from the
process off-gas before the off-gas enters the main ventilation. As a
result, the ventilation ducts should not become coated with the organic
materials, which would create a fire hazard.
Processes that produce either finely divided particles of metal or small
metal chips should have the same kind of front-end ventilation
adaptations as for hazardous vapors and liquids to prevent metal
accumulations in the off-gas ducting or in the final filtration train(s).
Roughing filters or centrifugal separators may be sufficient to remove
metal particles from the off-gas.
Processes that use corrosive chemicals (e.g., acids, perchlorates) should
use off-gas scrubbers to preclude damage to the exhaust air cleaning
system (e.g., HEPA filtration train).
Metallurgical processing equipment should have dedicated ventilation systems
that exhaust to a common, final filtration train. If airborne particle capture is
required, a high linear velocity will be necessary to ventilate these process areas
due to the greater densities of metal particles.
I-28


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