Chemical Engineering November 2011 - 22

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turned from the building if the filtration
efficiencies are 99.9% or greater, or
there is a mechanical damper or suppression
system on the exhaust ductwork
that meets NFPA standards.
And under NFPA 484, the standard
on combustible metals for processes
that include aluminum and tantalum,
dry type collectors must have explosion
venting or suppression and be
outdoors. No air can be returned to the
building. A wet collector can also be
used. For processes using magnesium,
niobium, titanium and zirconium, wet
collectors must be used.
NFPA 68, the standard on explosion
protection by deflagration venting,
states that explosion vents shall be
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located adjacent to a wall within
one hydraulic diameter and ducted
outdoors to a safe location, or, an approved
flameless vent can be used on
non-metallic dusts.
Micro Air's Orr says that existing
dust collectors can be retrofitted to
meet most of these standards via the
addition of explosion venting, ledgeless
hoppers and hard-pipe barrel lid
kits, mechanical back-blast dampers,
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and return air, fast acting valve
intake and return, flameless vents for
non-metallic dust only (used indoors)
or rotary airlocks.
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22 CHEMICAL ENGINEERING WWW.CHE.COM NOVEMBER 2011
AlmatecEseries_4625x7375-Sept 2011.indd 1
10/5/11 10:46 AM
" There is a lot to consider for each
application before deciding which approach
will work in a particular facility,
but it's important to remember that
you don't cut corners when it comes to
safety, " says John Dauber, vice president
of sales for U.S. and Canada with
Camfil-Farr (Jonesboro, Ark.). " These
explosions are dangerous. We test our
dust collectors (Figure 1 and 2) to confirm
our designs against NFPA standards,
and it is amazing to see what a
little baggie of cornstarch injected into
a collector and blown up can do. It's sobering
to say the least. "
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Circle 3 on p. 62 or go to adlinks.che.com/35071-03
After witnessing some of these test
explosions, says Dauber, his company
and many others began to dig deeply
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Chemical Engineering November 2011

Table of Contents for the Digital Edition of Chemical Engineering November 2011
