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GACT
(GENERALLY
AVAILABLE
CONTROL
TECHNOLOGY):
Methods,
practices
and
techniques
which
are
commercially
available
and
appropriate
considering
economic
impacts
and
the
technical
capabilities
of
the
firms
to
operate
and
maintain
the
emissions
control
systems.
Under
Title
III
of
the
CAAA,
EPA
will
establish
either
GACT
or
MACT
standards
for
each
source
of
HAPs.
GAS:
Not
a
liquid
or
a
solid.
A
state
of
matter
with
the
ability
to
diffuse
readily
into
other
gases
and
tends
to
expand
indefinitely.
GASES:
Normally
formless
fluids
which
occupy
the
space
of
its
enclosure
and
which
can
be
changed
to
a
liquid
or
solid
state
only
by
the
combined
effect
of
increased
pressure
and
decreased
temperature.
Gasses
diffuse.
GAS
FLOW
RATE,
CUBIC
FEET
PER
MINUTE
(CFM):
The
volume
of
process
gas
at
any
point
of
the
plant
exhaust
system
measured
in
terms
of
minutes.
There
are
several
units
of
measurement:
ACFM:
The
actual
gas
volumetric
flow
rate
(Actual
Cubic
Feet
per
Minute).
SCFM:
The
gas
volumetric
flow
rate,
corrected
to
70°
F
(standard
temperature)
and
standard
pressure
(1atm)
by
calculation
(Standard
Cubic
Feet
per
Minute).
DSCFM:
The
70°F
(standard
temperature)
and
standard
pressure
(1atm)
and
without
volume
of
steam
or
water
vapor
contained
in
the
exhaust
gas
(Dry
Standard
Cubic
Feet
per
Minute).
GASOLINE
VOLATILITY:
The
property
of
gasoline
whereby
it
evaporates
into
a
vapor.
Gasoline
volatility
is
measured
in
pounds
per
square
inch
(psi),
with
a
higher
number
reflecting
more
gasoline
evaporation.
Gasoline
vapor
is
a
VOC
(Volatile
Organic
Compound).
GAUGE
(GAGE):
Metal
manufacturers’
standard
measure
of
thickness
for
sheet
stock;
some
examples
for
steel
are:
Thickness
Weight
of
Steel
Gauge
(inches)
(lbs/ft)
7
.1793
7.50
10
.1345
5.625
12
.1046
4.375
14
.0747
3.125
16
.0598
2.50
GAUGE
PRESSURE:
The
pressure
differential
between
atmospheric
and
that
measured
in
the
system.
GRAIN:
A
dust
weight
unit
commonly
used
in
air
pollution
control.
Equal
to
one
seven
thousandth
of
a
pound.
One
grain
=
1
lb
or
1
lb
=
7,000
gr
7,000
GRAIN
LOADING:
The
rate
at
which
particles
are
emitted
from
a
pollution
source.
Measurement
is
made
by
the
number
of
grains
per
cubic
foot
of
gas
emitted.
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