Document ID: EPA-R06-OAR-2005-TX-0027-0032
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2006-08-25T04:00Z

Explanation
of
Lean
Burn/
Rich
Burn
Engine
Spreadsheet
Here's
what
each
of
the
significant
columns
in
the
spreadsheet
represents:

Account
 
the
account
number
of
the
company
found
in
the
TCEQ
permitting
database
Company
 
the
name
of
the
company
Site
 
the
name
of
the
company's
site
where
the
engine
is
located
County
 
the
county
where
the
site
is
located
FIN
 
the
facility
identification
number,
or
the
identifier
the
company
uses
for
the
engine
Facility
Name
 
the
name
of
the
facility
Engine
Rating
 
the
horsepower
rating
of
the
engine
SCC
 
source
classification
code
Description
 
description
of
the
engine
TPY
 
the
reported
2002
annual
emissions
Activity
 
the
activity
of
the
engine
in
hp­
hr/
yr
BEF
 
baseline
emission
factor;
the
uncontrolled
2002
emission
factor
in
g/
hp­
hr
SEF
 
strategic
emission
factor;
the
controlled
emission
factor
coming
into
effect
by
June
15,
2007
Credit
 
the
NOx
reduction
credit
being
claimed
in
tons
per
year
%
reduction
 
the
percent
reduction
from
2002
levels
Lean
or
Rich
 
the
type
of
engine
Each
line
the
spreadsheet
represents
one
engine.
The
rule
only
applies
to
19
engines
in
the
DFW
nonattainment
area.
The
reduction
credit
for
each
engine
was
calculated
using
the
following
equation:

Credit
in
tpy
=
Activity
in
hp­
hr/
yr
*
(
BEF
in
g/
hp­
hr
 
SEF
in
g/
hp­
hr)
*
(
1
lb/
453.6
g)
*
(
1
ton/
2000
lb)

The
percent
reduction
for
each
engine
was
calculated
using
the
following
equation:

Percent
reduction
=
(
BEF
 
SEF)/
BEF
*
100
Once
reduction
credits
for
each
engine
were
obtained,
total
annual
reductions
in
tpy
were
calculated
by
adding
up
the
credits
for
all
the
engines.
Then
total
daily
reductions
in
tpd
were
obtained
by
dividing
the
total
annual
reductions
by
365.
The
mean
percent
reduction
was
obtained
by
adding
the
percent
reduction
for
all
the
engines
and
dividing
the
result
by
the
number
of
engines.