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{longname} Q652. Are the results of Equations W-11A and W-11B in standard conditions or actual conditions? {longname} |
A652.
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Actual
...
conditions.
...
The
...
final
...
results
...
of
...
Equations
...
W-11A
...
and
...
W-11B
...
(average
...
flow
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rate
...
in
...
cubic
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feet
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per
...
hour
...
under
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subsonic
...
and
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sonic
...
flow,
...
respectively)
...
are
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at
...
actual
...
conditions,
...
and
...
must
...
be
...
converted
...
to
...
standard
...
conditions.
...
The
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flow
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rate,
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FR,
...
from
...
Equations
...
W-11A
...
and
...
W-11B
...
is
...
the
...
flow
...
rate
...
through
...
the
...
restriction
...
orifice
...
at
...
actual
...
conditions
...
(i.e.,
...
at
...
temperature
...
...
and
...
pressure
...
...
upstream
...
of
...
the
...
restriction
...
orifice).
...
Prior
...
to
...
using
...
the
...
flow
...
rate
...
output
...
from
...
Equations
...
W-11A
...
and
...
W-11B
...
in
...
Equation
...
W-12
...
and
...
subsequently
...
W-10A
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to
...
calculate
...
emissions,
...
it
...
is
...
necessary
...
to
...
convert
...
FR
...
to
...
standard
...
conditions.
...
Measured
...
and
...
calculated
...
FR
...
values
...
must
...
be
...
converted
...
from
...
actual
...
conditions
...
to
...
standard
...
conditions
...
using
...
Equation
...
W-33
...
in
...
40
...
CFR
...
98.233(t),
...
with
...
FR
...
substituted
...
for
...
Ea,n,
...
Tu
...
converted
...
to
...
degrees
...
Fahrenheit
...
and
...
substituted
...
for
...
Ta,
...
and
...
P1
...
(upstream
...
pressure
...
in
...
psia)
...
substituted
...
for
...
Pa.
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The
...
output
...
of
...
Equation
...
W-33
...
will
...
be
...
FR
...
at
...
standard
...
conditions,
...
suitable
...
for
...
use
...
in
...
Equations
...
W-12
...
and
...
ultimately
...
for
...
use
...
in
...
W-10A
...
to
...
calculate
...
emissions.
...
Part
...
98
...
generally
...
specifies
...
when
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a
...
conversion
...
is
...
needed.
...
In
...
this
...
case,
...
that
...
information
...
was
...
not
...
included
...
which
...
could
...
significantly
...
impact
...
the
...
results
...
of
...
W-10A.
...
EPA
...
is
...
considering
...
whether
...
a
...
revision
...
to
...
Part
...
98
...
is
...
the
...
most
...
appropriate
...
approach
...
to
...
address
...
this
...
issue.
...
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{info}
Source: Drafted new by EPA Final Review & W Team March 28, 2012
Approval / Publishing History: Version 1
Expiration: None
Relevant Subpart/Component: Subpart W
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