[Code of Federal Regulations]
[Title 40, Volume 20]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR89.207]
[Page 73-74]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 89_CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD
COMPRESSION-IGNITION ENGINES--Table of Contents
Subpart C_Averaging, Banking, and Trading Provisions
Sec. 89.207 Credit calculation.
(a) Requirements for calculating NOX credits from Tier 1
engines rated at or above 37 kW. (1) For each participating engine
family, emission credits (positive or negative) are to be calculated
according to one of the following equations and rounded, in accordance
with ASTM E29-93a, to the nearest one-hundredth of a megagram (Mg). This
ASTM procedure has been incorporated by reference (see Sec. 89.6).
Consistent units are to be used throughout the equation.
(i) For determining credit availability from all engine families
generating credits: Emission credits = (Std-FEL) x (Volume) x (AvgPR) x
(UL) x (Adjustment) x (10-6)
(ii) For determining credit usage for all engine families requiring
credits to offset emissions in excess of the standard:
Emission credits = (Std-FEL) x (Volume) x (AvgPR) x (UL) x
(10-6)
Where:
Std = the applicable Tier 1 NOX nonroad engine emission
standard, in grams per kilowatt-hour.
[[Page 74]]
FEL = the NOX family emission limit for the engine family in
grams per kilowatt-hour.
Volume = the number of nonroad engines eligible to participate in the
averaging, banking, and trading program within the given engine family
during the model year. Engines sold to equipment or vehicle
manufacturers under the provisions of Sec. 89.102(g) shall not be
included in this number. Quarterly production projections are used for
initial certification. Actual applicable production/sales volume is used
for end-of-year compliance determination.
AvgPR = the average power rating of all of the configurations within an
engine family, calculated on a sales-weighted basis, in kilowatts.
UL = the useful life for the engine family, in hours.
Adjustment = a one-time adjustment, as specified in paragraph (a)(2) of
this section, to be applied to Tier 1 NOX credits to be
banked or traded for determining compliance with the Tier 1
NOX standards or Tier 2 NOX+NMHC standards
specified in subpart B of this part. Banked credits traded in a
subsequent model year will not be subject to an additional adjustment.
Banked credits used in a subsequent model year's averaging program will
not have the adjustment restored.
(2) If an engine family is certified to a NOX FEL of 8.0
g/kW-hr or less, an Adjustment value of 1.0 shall be used in the credit
generation calculation described in paragraph (a)(1)(i) of this section.
If an engine family is certified to a NOX FEL above 8.0 g/kW-
hr, an Adjustment value of 0.65 shall be used in the credit generation
calculation described in paragraph (a)(1)(i) of this section. If the
credits are to be used by the credit-generating manufacturer for
averaging purposes in the same model year in which they are generated,
an Adjustment value of 1.0 shall be used for all engines regardless of
the level of the NOX FEL. If the credits are to be banked by
the credit-generating manufacturer and used in a subsequent model year
for another Tier 1 engine family, an Adjustment value of 1.0 shall be
used for all engines regardless of the level of the NOX FEL.
(b) Requirements for calculating NMHC + NOX Credits from
Tier 2 and later engines rated at or above 37 kW and Tier 1 and later
engines rated under 37 kW and PM credits from all engines. (1) For each
participating engine family, NOX + NMHC emission credits and
PM emission credits (positive or negative) are to be calculated
according to one of the following equations and rounded, in accordance
with ASTM E29-93a, to the nearest one-hundredth of a megagram (Mg). This
procedure has been incorporated by reference (see Sec. 89.6).
Consistent units are to be used throughout the equation.
(i) For determining credit availability from all engine families
generating credits:
Emission credits = (Std-FEL) x (Volume) x (AvgPR) x (UL) x
(10-6)
(ii) For determining credit usage for all engine families requiring
credits to offset emissions in excess of the standard:
Emission credits = (Std-FEL) x (Volume) x (AvgPR) x (UL) x
(10-6)
Where:
Std = the current and applicable nonroad engine emission standard, in
grams per kilowatt-hour, except for PM calculations where it is the
applicable nonroad engine Tier 2 PM emission standard, and except for
engines rated under 19 kW where it is the applicable nonroad engine Tier
2 emission standard, in grams per kilowatt-hour. (Engines rated under 19
kW participating in the averaging and banking program provisions of
Sec. 89.203(c)(3)(ii) shall use the Tier 1 standard for credit
calculations.)
FEL = the family emission limit for the engine family in grams per
kilowatt-hour.
Volume = the number of nonroad engines eligible to participate in the
averaging, banking, and trading program within the given engine family
during the model year. Engines sold to equipment or vehicle
manufacturers under the provisions of Sec. 89.102(g) shall not be
included in this number. Quarterly production projections are used for
initial certification. Actual applicable production/sales volume is used
for end-of-year compliance determination.
AvgPR = the average power rating of all of the configurations within an
engine family, calculated on a sales-weighted basis, in kilowatts.
UL = the useful life for the given engine family, in hours.
[63 FR 57008, Oct. 23, 1998]