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CAAA:
Clean
Air
Act
Amendments
of
1990.
Title
I:
Non-attainment:
Ambient
Air
Quality
Title
II:
Motor
Vehicles
Title
III:
Hazardous
Air
Pollutants
Title
IV:
Acid
Rain
Title
V:
Permits
Title
VI:
Stratospheric
Ozone
Title
VII:
Enforcement
Title
VIII:
Miscellaneous
CAKING:
Material
crusted
on
a
bag
that
cannot
be
removed
by
the
cleaning
mechanism.
Frequently
caused
by
the
dust
on
the
bags
getting
wet.
CALENDARED
FINISH:
An
available
smooth
finish
for
felt
bags.
Felt
is
drawn
between
two
hot
oil-filled
rolls,
where
heat
and
pressure
press
down
“hairs”
on
the
felt,
imparting
a
smooth
finish
that
improves
dust
release.
CALENDARING:
The
application
of
either
hot
or
cold
pressure
to
smooth
or
polish
a
fabric,
thereby
reducing
the
thickness
of
the
cloth
by
spreading
the
warp
and
filling
yarns
into
a
ribbon
shape.
CAN
VELOCITY:
As
related
to
baghouses,
the
gas
velocity
within
the
collector.
Dividing
the
gas
volume
by
the
cross
sectional
area
of
the
collector
determines
“can
velocity.”
Also
see
interstitial
velocity.
CAPACITOR
START
MOTOR:
Type
of
single-phase
induction
motor
with
a
capacitor
connected
in
series
with
the
starting
winding.
High–starting
and
breakdown
torque,
medium
starting
current.
Used
in
hard-starting
applications;
compressors,
pumps,
etc.
CAPTURE
VELOCITY:
The
air
velocity
at
any
point
in
front
of
a
hood
or
at
a
hood
opening
necessary
to
overcome
opposing
air
currents
and
to
capture
the
contaminated
air
at
that
point
by
causing
it
to
flow
into
the
hood.
CARBON
MONOXIDE:
A
colorless,
odorless
gas
that
is
toxic
because
of
its
tendency
to
reduce
the
oxygen-carrying
characteristic
of
blood.
CARRYING
VELOCITY:
The
gas
velocity
that
is
necessary
to
keep
contaminants
airborne.
Usually
between
2,000
to
5,000
ft/min
in
duct
work,
depending
on
the
nature
of
the
contaminant.
CARTRIDGE:
See
pleated
filter
elements.
CARTRIDGE
FILTER:
An
air
pollution
control
device
that
traps
gas-borne
particulates
by
forcing
the
gas
through
filter
element
cartridges.
The
cartridges
are
typically
made
with
pleated
non-woven
media.
Recently,
100%
spun
bond
synthetic
media
filters
have
been
developed.
CHEMICAL
ABSTRACTS
SERVICE
(CAS):
Registry
Number
is
a
numeric
designation
assigned
by
the
American
Chemical
Society’s
Chemical
Abstracts
Service,
which
uniquely
identifies
a
specific
chemical
compound.
CELLPLATE:
See
tubesheet.
CELLULOSE:
The
chief
part
of
fibrous
products
that
are
used
to
make
the
filter
media
for
many
cartridge
filters.
Sometimes
referred
to
as
“paper”
media.
CENTIFUGAL
COLLECTOR:
Any
of
several
mechanical
systems
using
centrifugal
force
to
remove
particulate
from
a
gas
stream.
CELSIUS:
A
thermometric
scale
in
which
water
boils
at
100°
and
freezes
at
0°,
same
as
centigrade.
°C
=
0.5556
x
(°F
–
32°)
5/9
=
0.5556
CFM:
Volumetric
flow
rate
expressed
as
Cubic
Feet
(of
any
gaseous
mixture)
per
Minute.
See
gas
flow.
CHAMBER
SILENCER:
Insulated
box
or
housing
placed
around
a
fan
and
motor
to
attenuate
sound.
CLOTH:
In
general
a
pliant
fabric;
woven,
knitted,
felted
or
otherwise
formed
of
any
textile
fiber,
wire
or
other
suitable
material.
Usually
understood
to
mean
a
woven
felted
or
textile
fabric.
CLOTH
WEIGHT:
Usually
expressed
in
ounces
per
square
yard
or
ounces
per
square
foot.
However,
cotton
sateen
is
often
specified
as
a
certain
number
of
linear
yards
per
pound
in
a
54”
width.
COKE
OVEN:
An
industrial
process
which
converts
coal
into
coke,
which
is
one
of
the
basic
materials
used
in
blast
furnaces
for
the
conversion
of
iron
ore
into
iron.
COLD
SPOT:
On
an
insulated
baghouse,
a
point
where
metal
goes
through
insulation,
creating
an
uninsulated
area
where
heat
dissipates
rapidly.
COLLECTING
EFFICIENCY:
The
ability
of
a
dust
collector
to
remove
particulate
from
the
exhaust
gas.
The
ratios
of
particles
entering
the
collection
device
vs.
particles
leaving
is
expressed
in
percent.
inlet
loading
–
outlet
loading
x
100
inlet
loading
COLLECTION:
Removal
of
contaminants
from
an
airstream.
Note,
collection
is
distinct
from
“capture”
in
that
both
must
be
accomplished
if
an
air
cleaning
system
is
to
function
properly.
COLLECTION
CELL:
Set
of
alternately
charged
and
grounded
plates
in
a
SMOGHOG
electrostatic
precipitator
where
particle
collection
occurs.
COLLECTOR:
Used
interchangeably
with
“baghouse,”
“cartridge
filter”
or
mechanical
collector,
as
in
“cyclone.”
COMBUSTIBLE/EXPLOSIVE
DUST:
Finely
divided
materials
that
can
cause
or
support
combustion,
such
as
aluminum,
flour,
corn
starch,
etc.
COMBUSTION:
The
production
of
heat
and
light
energy
through
a
chemical
process;
usually
oxidation.
One
of
the
three
basic
contributing
processes
of
air
pollution,
the
others
being
attrition
and
vaporization.
COMBUSTION
AIR:
Amount
of
air
necessary
to
burn
available
fuel.
COMBUSTION
PRODUCTS:
(1)
Primarily
gaseous
matter
such
as
carbon
oxides,
nitrogen,
oxygen
and
water
vapor,
resulting
from
the
combustion
of
fossil
fuels.
(2)
In
the
context
of
emission
control,
the
gaseous
products
resulting
from
burning
any
kind
of
material
containing
carbon
in
a
free
state
or
combined
state.
Also
referred
to
as
“combustion
contaminants.”
COMPRESSIBILITY:
A
factor
used
by
fan
manufacturers
to
correct
performance
rating
in
higher
pressure
ranges
to
account
for
the
fact
that
air
is
a
compressible
gas
that
does
not
follow
the
perfect
gas
laws.
COMPRESSION:
A
phenomenon
related
to
positive
pressure.
When
air
is
forced
into
a
system,
it
is
compressed
and
becomes
more
dense.
Depending
on
the
volume
or
weight
of
air
required
down
stream
in
the
positive
pressure
portion
of
the
system,
the
volume
of
air
at
the
inlet
of
a
fan
may
have
to
be
adjusted
by
the
ratio
of
absolute
pressure
at
the
entrance
of
the
fan
versus
the
design
requirements
in
the
system.
CONCENTRATION:
The
amount
of
dust
in
gas.
Usually
expressed
in
terms
of
grains
per
ft3,
lbs
per
1,000
lbs
of
gas,
parts
per
million
or
milligrams
per
cubic
meter.
CONDENSIBLE
PARTICULATE:
Hot
gases
or
vapors
that
condense
when
cooled.
UAS
uses
the
term
to
define
the
contaminants
in
a
hot
process
exhaust
that
are
gases
when
generated
and
can
be
cooled
to
form
aerosol
particles.
CONTAMINANT:
Unwanted
airborne
substance
that
can
be
a
health
hazard
or
can
create
visibility
problems
within
the
industrial
environment.
CONTROL:
The
reduction
of
pollutant
emissions
by
addition
of
air
cleaning
equipment
designed
to
collect
all
or
part
of
the
contaminant
generated
by
a
process.
CORROSIVE
DUST:
Particles
that
can
cause
degradation
by
chemical
action
to
surfaces
they
contact,
such
as
salt,
soda
ash,
detergents,
etc.
CONVERSION
FACTORS:
See
Section
8.
CONVEYING
VELOCITY:
The
air
velocity
required
in
a
duct
system
to
maintain
entrainment
of
a
specific
material.
CORROSION:
The
deterioration
of
material
by
chemical
or
electrochemical
reaction
resulting
from
exposure
to
weathering,
moisture,
chemical
or
other
agents
in
the
environment
in
which
it
is
placed.
CRST
(Cellulosic
Fibers,
Resin
Impregnated,
Silicone
Treated):
A
type
of
filter
media
used
in
high-quality
cartridges.
The
treatments
enhance
filter
life
and
moisture
resistance.
CSA
(Canadian
Standards
Association):
Sets
safety
standards
for
motors
and
other
electrical
equipment
used
in
Canada.
CTG
(CONTROL
TECHNIQUES
GUIDELINE):
Guidance
documents
issued
by
EPA
which
define
Reasonably
Available
Control
Technology
(RACT)
to
be
applied
to
existing
facilities
that
emit
certain
threshold
quantities
of
air
pollutants;
they
contain
information
both
on
the
economic
and
technological
feasibility
of
available
techniques.
CURVE,
FAN
PERFORMANCE:
A
graphic
representation
of
static
or
total
pressure
and
fan
BHP
requirements
over
an
airflow
volume
range
at
a
stated
inlet
density
and
fan
speed.
CURVE,
SYSTEM:
A
graphic
representation
of
the
pressure
versus
flow
characteristics
of
a
given
system
and
density.
CYCLONE
COLLECTOR:
A
kind
of
centrifugal
collector
equipment.
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