[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR92.132]
[Page 465-474]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 92--CONTROL OF AIR POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES--
Table of Contents
Subpart B--Test Procedures
Sec. 92.132 Calculations.
(a) Duty-cycle emissions. This section describes the calculation of
duty-cycle emissions, in terms of grams per brake horsepower hour (g/
bhp-hr). The calculation involves the weighted summing of the product of
the throttle notch mass emission rates and dividing by the weighted sum
of the brake horsepower. The final reported duty-cycle emission test
results are calculated as follows:
(1)(i) Eidc=([Sigma](Mij)(Fj))/
([Sigma](BHPj)(Fj))
Where:
Eidc=Duty-cycle weighted, brake-specific mass emission rate
of pollutant i (i.e., HC, CO, NOX or PM and, if appropriate,
THCE or NMHC) in grams per brake horsepower-hour;
Mij=the mass emission rate pollutant i for mode j;
Fj=the applicable weighting factor listed in Table B132-1 for
mode j;
BHPj=the measured brake horsepower for mode j.
(ii) Table B132-1 follows:
Table B132-1--Weighting Factors for Calculating Emission Rates
----------------------------------------------------------------------------------------------------------------
Locomotive not equipped Locomotive equipped with
with multiple idle multiple idle notches
Throttle notch setting Test mode notches -------------------------
--------------------------
Line-haul Switch Line-haul Switch
----------------------------------------------------------------------------------------------------------------
Low Idle....................................... 1a NA NA 0.190 0.299
Normal Idle.................................... 1 0.380 0.598 0.190 0.299
Dynamic Brake.................................. 2 0.125 0.000 0.125 0.000
Notch 1........................................ 3 0.065 0.124 0.065 0.124
Notch 2........................................ 4 0.065 0.123 0.065 0.123
Notch 3........................................ 5 0.052 0.058 0.052 0.058
Notch 4........................................ 6 0.044 0.036 0.044 0.036
Notch 5........................................ 7 0.038 0.036 0.038 0.036
Notch 6........................................ 8 0.039 0.015 0.039 0.015
Notch 7........................................ 9 0.030 0.002 0.030 0.002
Notch 8........................................ 10 0.162 0.008 0.162 0.008
----------------------------------------------------------------------------------------------------------------
[[Page 466]]
(2) Example: For the line-haul cycle, for locomotives equipped with
normal and low idle, and with dynamic brake, the brake-specific emission
rate for HC would be calculated as:
EHCdc=[(MHCla) (0.190)+(MHC1)
(0.190)+(MHC2) (0.125)+(MHC3)
(0.065)+(MHC4) (0.065)+(MHC5)
(0.052)+(MHC6) (0.044)+(MHC7)
(0.038)+(MHC8) (0.039)+(MHC9)
(0.030)+(MHC10) (0.162)]/[(BHP1a)
(0.190)+(BHP1) (0.190)+(BHP2)
(0.125)+(BHP3) (0.065)+(BHP4)
(0.065)+(BHP5) (0.052)+(BHP6)
(0.044)+(BHP7) (0.038)+(BHP8)
(0.039)+(BHP9) (0.030)+(BHP10) (0.162)]
(3) In each mode, brake horsepower output is the power that the
engine delivers as output (normally at the flywheel), as defined in
Sec. 92.2.
(i) For locomotive testing (or engine testing using a locomotive
alternator/generator instead of a dynamometer), brake horsepower is
calculated as:
BHP=HPout/Aeff+HPacc
Where:
HPout=Measured horsepower output of the alternator/generator.
Aeff=Efficiency of the alternator/generator.
HPacc=Accessory horsepower.
(ii) For engine dynamometer testing, brake horsepower is determined
from the engine speed and torque.
(4) For locomotive equipped with features that shut the engine off
after prolonged periods of idle, the measured mass emission rate
Mi1 (and Mi1a as applicable) shall be multiplied
by a factor equal to one minus the estimated fraction reduction in
idling time that will result in use from the shutdown feature.
Application of this adjustment is subject to the Administrator's
approval.
(b) Throttle notch emissions. This paragraph (b) describes the
calculation of throttle notch emissions for all operating modes,
including: idle (normal and low, as applicable); dynamic brake; and
traction power points. The throttle notch (operating mode) emission test
results, final reported values and values used in paragraph (a)(1) of
this section are calculated as follows:
(1) Brake specific emissions (Eij) in grams per brake
horsepower-hour of each species i (i.e., HC, CO, NOX or PM
and, if appropriate, THCE or NMHC) for each mode j:
(i) EHC mode=HC grams/BHP-hr=MHC mode/Measured
BHP in mode.
Where:
MHC mode=Mass HC emissions (grams per hour) for each test
mode.
(ii) ETHCE mode=THCE grams/BHP-hr=MTHCE mode/
Measured BHP in mode.
Where:
MTHCE mode (Total hydrocarbon equivalent mass emissions
(grams per hour) for each test mode):
=MHCj+[Sigma] (Mij) (MWCp)/
MWCi
Mij=the mass emission rate oxygenated pollutant i for mode j.
MWCi=the molecular weight of pollutant i divided by the
number of carbon atoms per molecule of pollutant i.
MWCp=the molecular weight of a typical petroleum fuel
component divided by the number of carbon atoms per molecule of a
typical petroleum fuel component=13.8756.
(iii) ENMHC mode=NMHC grams/BHP-hr=MNMHC mode/
Measured BHP in mode.
Where:
MNMHC mode=Mass NMHC emissions (grams per hour) for each test
mode.
(iv) ECO mode=CO grams/BHP-hr=MCO mode/
Measured BHP in mode.
Where:
MCO mode=Mass CO emissions (grams per hour) for each test
mode.
(v) ENOx mode=NOX grams/BHP-
hr=MNOx mode/Measured BHP in mode.
Where:
MNOx mode=Mass NOX emissions (grams per hour) for
each test mode.
(vi) EPM mode=PM grams/BHP-hr=MPM mode/
Measured BHP in mode.
Where:
MPM mode=Mass PM emissions (grams per hour) for each test
mode.
(vii) EAL mode=Aldehydes grams/BHP-
hr=MAL mode/Measured BHP in mode.
(vii) EAL mode=Aldehydes grams/BHP-
hr=MAL mode/Measured BHP in mode.
Where:
MAL mode=Total aldehyde mass emissions (grams per hour) for
each test mode.
(2) Mass Emissions--Raw exhaust measurements. For raw exhaust
measurements mass emissions (grams per hour) of each species for each
mode:
(i) General equations. (A) The mass emission rate,
MX mode (g/hr), of each
[[Page 467]]
pollutant (HC, NOX, CO2, CO, CH4
CH3OH, CH3CH2OH, CH2O,
CH3CH2O) for each operating mode for raw
measurements is determined based on one of the following equations:
MX mode=(DX/106)(DVol)(MWX/
Vm)
MX mode=(WX/106)(WVol)(MWX/
Vm)
Where:
X designates the pollutant (e.g., HC), DX is the concentration of
pollutant X (ppm or ppmC) on a dry basis, MWX is the
molecular weight of the pollutant (g/mol), DVol is the total exhaust
flow rate (ft3/hr) on a dry basis, WX is the concentration of
pollutant X (ppm or ppmC) on a wet basis, WVol is the total exhaust flow
rate (ft3/hr) on a wet basis, Vm is the volume of
one mole of gas at standard temperature and pressure (ft3/
mol).
(B) All measured volumes and volumetric flow rates must be corrected
to standard temperature and pressure prior to calculations.
(ii) The following abbreviations and equations apply to this
paragraph (b)(2):
[alpha]=Atomic hydrogen/carbon ratio of the fuel.
[beta]=Atomic oxygen/carbon ratio of the fuel.
CMWf=Molecular weight of the fuel per carbon atom, or carbon
molecular weight (g/moleC)=(12.011+1.008[alpha]+16.000[beta]).
DCO=CO concentration in exhaust, ppm (dry).
DCO2=CO2 concentration in exhaust, percent (dry).
DHC=HC carbon concentration in exhaust, ppm C (dry).
DNOX=NOX concentration in exhaust, in ppm (dry).
DVol=Total exhaust flow rate (ft3/hr) on a dry basis; or
=(Vm)(Wf)/((CMWf) (DHC/
106+DCO/106+DCO2/100)).
K=Water gas equilibrium constant=3.5.
Kw=Wet to dry correction factor.
MF=Mass flow-rate of fuel used in the engine in lb/
hr=Wf/453.59.
MWC=Atomic weight of carbon=12.011.
MWCO=Molecular weight of CO=28.011.
MWH=Atomic weight of hydrogen=1.008.
MWNO2=Molecular weight of nitrogen dioxide
(NO2)=46.008.
MWO=Molecular weight of atomic oxygen=16.000.
T=Temperature of inlet air ( deg.F).
Vm=Volume of one mole of gas at standard temperature and
pressure (ft3/mole).
Wf=Mass flow-rate of fuel used in the engine, in grams/
hr=(453.59)x(Mf lbs/hr).
WCO2=CO2 concentration in exhaust, percent (wet).
WHC=HC concentration in exhaust, ppm C (wet).
WVol=Total exhaust flow rate (ft3/hr) on a wet basis; or
=(Vm)(Wf)/((CMWf)(WHC/
106+WCO/106 WCO2/100)).
(iii) Calculation of individual pollutant masses. Calculations for
mass emission are shown here in multiple forms. One set of equations is
used when sample is analyzed dry (equations where the concentrations are
expressed as DX), and the other set is used when the sample is analyzed
wet (equations where the concentrations are expressed as WX). When
samples are analyzed for some constituents dry and for some constituents
wet, the wet concentrations must be converted to dry concentrations, and
the equations for dry concentrations used. Also, the equations for HC,
NMHC, CO, and NOX have multiple forms that are algebraically
equivalent: An explicit form that requires intermediate calculation of
Vm and DVol or WVol; and an implicit form that uses only the
concentrations (e.g., DCO) and the mass flow rate of the fuel. For these
calculations, either form may be used.
(A) Hydrocarbons and nonmethane hydrocarbons.
(1) Hydrocarbons. (i) For petroleum-fueled engines:
MHC mode
=(DHC)CMWf(DVol)(106)/Vm
=((DHC/106)(Wf)/((DCO/
106)+(DCO2/100)+(DHC/106)+([Sigma]DX/
106)))
MHC mode
=(WHC)CMWf(WVol)(106)/Vm
=((WHC/106)(Wf)/((WCO/
106)+(WCO2/100)+(WHC/106)+([Sigma](WX/
106)))
(ii) For alcohol-fueled engines:
DHC=FID HC-[Sigma](rx)(DX)
WHC=FID HC-[Sigma](rx)(WX)
Where:
FID HC=Concentration of ``hydrocarbon'' plus other organics such as
methanol in exhaust as measured by the FID, ppm carbon equivalent.
rx=FID response to oxygenated speciesx(methanol, ethanol, or
acetaldehyde).
DX=Concentration of oxygenated speciesx(methanol, ethanol, or
acetaldehyde) in exhaust as determined from the dry exhaust sample, ppm
carbon (e.g., DCH3OH, 2(DCH3CH2OH)).
WX=Concentration of oxygenated speciesx(methanol, ethanol, or
acetaldehyde) in exhaust as determined from the wet exhaust sample, ppm
carbon.
[[Page 468]]
[Sigma]DX=The sum of concentrations DX for all oxygenated species.
[Sigma]WX=The sum of concentrations WX for all oxygenated species.
(2) Nonmethane hydrocarbons:
MNMHC mode=(DNMHC)CMWf(DVol) (106)/
Vm
=((DNMHC/106)(Wf)/((DCO/
106)+(DCO2/100)+(DHC/106)))
MNMHC mode=(WNMHC)CMWf(WVol) (106)/
Vm
=((WNMHC/106)(Wf)/((WCO/
106)+(WCO2/100)+(WHC/106)))
Where:
DNMHC=FID HC-(rCH4)(DCH4)
WNMHC=FID HC-(rCH4)(WCH4)
FID HC=Concentration of ``hydrocarbon'' plus other organics such as
methane in exhaust as measured by the FID, ppm carbon equivalent.
rCH4=FID response to methane.
DCH4=Concentration of methane in exhaust as determined from the dry
exhaust sample, ppm.
WCH4=Concentration of methane in exhaust as determined from the wet
exhaust sample, ppm.
(B) Carbon monoxide:
MCO mode=(DCO)MWCO(DVol)/106/
Vm
=((MWCO(DCO/106)(Wf)/
((CMWf)(DCO/106)+(DCO2/100)+DHC/
106)+([Sigma]DX/106)))
MCO mode=(WCO)MWCO(DVol)(106)/
Vm
+((MWCO(WCO/106)(Wf)/
((CMWf)(WCO/106)+(WCO2/100)+WHC/
106)+([Sigma]WX/106)))
(C) Oxides of nitrogen:
MNOx mode=(DNOX)MWNO2(DVol)(106)/
Vm
=((MWNO2(DNOX/106)(Wf)/
((CMWf)(DCO/106)+(DCO2/100)+(DHC/
106)+([Sigma]DX/106)))
MNOx mode=(WNOX)MWNO2(DVol)(106)/
Vm
=((MWNO2(WNOX/106)(Wf)/
((CMWf)(WCO/106)+(WCO2/100)+(WHC/
106)+([Sigma]WX/106)))
(D) Methanol:
MCH3OH mode=(DCH3OH/106)32.042(DVol)/Vm
MCH3OH mode=(WCH3OH/106)32.042(WVol)/Vm
Where:
DCH3OH=(Vm)(106)[(C1xAV1)+(C2
xAV2)]/DVolMS.
WCH3OH=(Vm)(106)[(C1xAV1)+(C2
xAV2)]/WVolMS.
Ci=concentration of methanol in impinger i (1 or 2) in mol/
ml.
AVi=Volume of absorbing reagent in impinger i (1 or 2) in ml.
DVolMS=Volume (standard ft3) of exhaust sample
drawn through methanol impingers (dry).
WVolMS=Volume (standard ft3) of exhaust sample
drawn through methanol impingers (wet).
(E) Ethanol:
MCH3CH2OH mode=(DCH3CH2OH/106)23.035(DVol)/
Vm
MCH3CH2OH mode = (WCH3CH2OH/106)23.035(WVol)/
Vm
Where:
DCH3CH2OH=(Vm)(106)[(C1xAV1)
+(C2xAV2)]/DVolES.
WCH3CH2OH=(Vm)(106)[(C1xAV1)+
(C2xAV2)]/WVolES.
Ci=concentration of ethanol in impinger i (1 or 2) in mol/ml.
AVi=Volume of absorbing reagent in impinger i (1 or 2) in ml.
DVolES=Volume (standard ft3) of exhaust sample
drawn through ethanol impingers (dry).
WVolES=Volume (standard ft3) of exhaust sample
drawn through ethanol impingers (wet).
(F) Formaldehyde:
MCH2O mode=(DCH2O/106)30.026(DVol)/Vm
MCH2O mode=(WCH2O/106)30.026(WVol)/Vm
(1) If aldehydes are measured using impingers:
DCH2O=(Vm)(106)[(C1xAV1)+(C2
xAV2)]/DVolFS
WCH2O=(Vm)(106)[(C1xAV1)+(C2
xAV2)]/WVolFS
(2) If aldehydes are measured using cartridges:
DCH2O=(Vm)(106)(CRxAVR)/
DVolFS
WCH2O=(Vm)(106)(CRxAVR)/
WVolFS
(3) The following definitions apply to this paragraph
(b)(2)(iii)(F):
AVi=Volume of absorbing reagent in impinger i (1 or 2) in ml.
AVR=Volume of absorbing reagent use to rinse the cartridge in
ml.
Ci=concentration of formaldehyde in impinger i (1 or 2) in
mol/ml.
CR=concentration of formaldehyde in solvent rinse in mol/ml.
DVolFS=Volume (standard ft3) of exhaust sample
drawn through formaldehyde sampling system (dry).
WVolFS=Volume (standard ft3) of exhaust sample
drawn through formaldehyde sampling system (wet).
(G) Acetaldehyde:
MCH3CHO mode=(DCH3CHO/106)27.027(DVol)/
Vm
MCH3CHO mode=(WCH3CHO/106)27.027(WVol)/
Vm
[[Page 469]]
(1) If aldehydes are measured using impingers:
DCH3CHO=(Vm)(106)[(C1xAV1)+(C
2x AV2)]/DVolAS
WCH3CHO=(Vm)(106)[(C1xAV1)+C2
x AV2)]/WVolAS
(2) If aldehydes are measured using cartridges:
DCH3CHO=(Vm)(106)(CRxAVR)/
DVolAS
WCH3CHO=(Vm)(106)(CRxAVR)/
WVolAS
(3) The following definitions apply to this paragraph
(b)(2)(iii)(G):
AVi=Volume of absorbing reagent in impinger i (1 or 2) in ml.
AVR=Volume of absorbing reagent use to rinse the cartridge in
ml.
Ci=concentration of acetaldehyde in impinger i (1 or 2) in
mol/ml.
CR=concentration of acetaldehyde in solvent rinse in mol/ml.
DVolAS=Volume (standard ft3) of exhaust sample
drawn through acetaldehyde sampling system (dry).
WVolAS=Volume (standard ft3) of exhaust sample
drawn through acetaldehyde sampling system (wet).
(iv) Conversion of wet concentrations to dry concentrations. Wet
concentrations are converted to dry concentrations using the following
equation:
DX=KW WX
Where:
WX is the concentration of species X on a wet basis.
DX is the concentration of species X on a dry basis.
KW is a conversion factor=WVol/DVol=1+DH2O.
(A) Iterative calculation of conversion factor. The conversion
factor KW is calculated from the fractional volume of water
in the exhaust on a dry basis (DH2O=volume of water in exhaust/dry
volume of exhaust). Precise calculation of the conversion factor
KW must be done by iteration, since it requires the dry
concentration of HC, but HC emissions are measured wet.
(1) The conversion factor is calculated by first assuming DHC=WHC to
calculate DVol:
DVol=(Vm)(Wf)/((CMWf)(DHC/
106+DCO/106+DCO2/100))
(2) This estimate is then used in the following equations to
calculate DVolair, then DH2O, then KW, which
allows DHC to be determined more accurately from WHC:
[GRAPHIC] [TIFF OMITTED] TR16AP98.009
Where:
Y=Water volume concentration in intake air, volume fraction (dry).
DVolair=Air intake flow rate (ft3/hr) on a dry
basis, measured, or calculated as:
[GRAPHIC] [TIFF OMITTED] TR16AP98.010
(3) The calculations are repeated using this estimate of DHC. If the
new estimate for KW is not within one percent of the previous
estimate, the iteration is repeated until the difference in
KW between iterations is less than one percent.
(B) Alternate calculation of DH2O (approximation). The following
approximation may be used for DH2O instead of the calculation in
paragraph (b)(2)(iv)(A) of this section:
[[Page 470]]
[GRAPHIC] [TIFF OMITTED] TR16AP98.011
Where:
[GRAPHIC] [TIFF OMITTED] TR16AP98.012
Y=Water volume concentration in intake air, volume fraction (dry).
(3) Mass Emissions--Dilute exhaust measurements. For dilute exhaust
measurements mass emissions (grams per hour) of each species for each
mode:
(i) General equations. The mass emission rate, Mx mode
(g/hr) of each pollutant (HC, NOX, CO2, CO, CH4 CH3OH,
CH3CH2OH, CH2O, CH3CH2O) for each operating mode for bag measurements
and diesel continuously heated sampling system measurements is
determined from the following equation:
Mx mode=(Vmix)(Densityx)(Xconc
)/(Vf)
Where:
x designates the pollutant (e.g., HC), Vmix is the total
diluted exhaust volumetric flow rate (ft3/hr),
Densityx is the specified density of the pollutant in the gas
phase (g/ft3), Xconc is the fractional
concentration of pollutant x (i.e., ppm/106, ppmC/
106, or %/100), and Vf is the fraction of the raw
exhaust that is diluted for analysis.
(ii) The following abbreviations and equations apply to paragraphs
(b)(3)(i) through (b)(3)(iii)(J) of this section:
(A) DF=Dilution factor, which is the volumetric ratio of the
dilution air to the raw exhaust sample for total dilution, calculated
as:
[GRAPHIC] [TIFF OMITTED] TR16AP98.013
Where:
WCO2=Carbon dioxide concentration of the raw exhaust sample, in percent
(wet).
WCO2e=Carbon dioxide concentration of the dilute exhaust
sample, in percent (wet).
WCO2d=Carbon dioxide concentration of the dilution air, in
percent (wet).
(B) Vmix=Diluted exhaust volumetric flow rate in cubic
feet per hour corrected to standard conditions (528 deg.R, and 760 mm
Hg).
(C) Vf=Fraction of the total raw exhaust that is diluted
for analysis.
=((CO2conc/102)+(COconc/
106)+(HCconc/
106))(Vmix)(CMWf)/Vm/
Mf
(iii) Calculation of individual pollutants.
(A) MHC mode=Hydrocarbon emissions, in grams per hour by
mode, are calculated using the following equations:
MHC mode=(Vmix)(DensityHC)(HCconc
/106)/Vf
HCconc=HCe-(HCd)(1-(1/DF))
HCe=FID HCe-[Xi](rx)(Xe)
Where:
DensityHC=Density of hydrocarbons=16.42 g/ft3
(0.5800 kg/m3) for l petroleum diesel fuel, 16.27 g/
ft3 (0.5746 kg/m3) for 2 diesel, and
16.33 g/ft3 (0.5767 kg/m3) for other fuels,
assuming an average carbon to hydrogen ratio of 1:1.93 for 1
petroleum diesel fuel, 1:1.80 for 2 petroleum diesel fuel, and
1:1.85 for hydrocarbons in other fuels at standard conditions.
[[Page 471]]
HCconc=Hydrocarbon concentration of the dilute exhaust sample
corrected for background, in ppm carbon equivalent (i.e., equivalent
propanex3).
HCe=Hydrocarbon concentration of the dilute exhaust bag
sample, or for diesel continuous heated sampling systems, average
hydrocarbon concentration of the dilute exhaust sample as determined
from the integrated HC traces, in ppm carbon equivalent. For petroleum-
fueled engines, HCe is the FID measurement. For methanol-
fueled and ethanol-fueled engines:
FID HCe=Concentration of hydrocarbon plus methanol, ethanol
and acetaldehyde in dilute exhaust as measured by the FID, ppm carbon
equivalent.
rx=FID response to oxygenated species x (methanol, ethanol or
acetaldehyde).
Xe=Concentration of species x (methanol, ethanol or
acetaldehyde) in dilute exhaust as determined from the dilute exhaust
sample, ppm carbon.
HCd=Hydrocarbon concentration of the dilution air as
measured, in ppm carbon equivalent.
(B) MNOx mode = Oxides of nitrogen emissions, in grams
per hour by mode, are calculated using the following equations:
MNOx mode=(Vmix) (DensityNO2)
(NOxconc/10 \6\) /Vf
NOxconc=(NOxe-NOxd(1-(1/DF)))
Where:
DensityNO2=Density of oxides of nitrogen is 54.16 g/ft\3\
(1.913 kg/m\3\), assuming they are in the form of nitrogen dioxide, at
standard conditions.
NOxconc=Oxides of nitrogen concentration of the dilute
exhaust sample corrected for background, in ppm.
NOxe=Oxides of nitrogen concentration of the dilute exhaust
bag sample as measured, in ppm.
NOxd=Oxides of nitrogen concentration of the dilution air as
measured, in ppm.
(C) MCO2 mode=Carbon dioxide emissions, in grams per hour
by mode, are calculated using the following equations:
MCO2 mode=(Vmix) (Density CO2)
(CO2conc/10\2\) /Vf
CO2conc=CO2e-CO2d(1-(1/DF))
Where:
Density CO2=Density of carbon dioxide is 51.81 g/ft\3\ (1.830
kg/m\3\), at standard conditions.
CO2conc=Carbon dioxide concentration of the dilute exhaust
sample corrected for background, in percent.
CO2e=Carbon dioxide concentration of the dilute exhaust bag
sample, in percent.
CO2d=Carbon dioxide concentration of the dilution air as
measured, in percent.
(D)(1) MCO mode=Carbon monoxide emissions, in grams per
hour by mode, are calculated using the following equations:
MCO mode=(Vmix)(DensityCO)(COconc
/10\6\)/Vf
COconc=COe-COd(1-(1/DF))
COd=(1-0.000323R)COdm
Where:
DensityCO=Density of carbon monoxide is 32.97 g/ft\3\ (1.164
kg/m\3\), at standard conditions.
COconc=Carbon monoxide concentration of the dilute exhaust
sample corrected for background, water vapor, and CO2
extraction, ppm.
COe=Carbon monoxide concentration of the dilute exhaust
sample volume corrected for water vapor and carbon dioxide extraction,
in ppm.
COe=(1-(0.01+0.005/[alpha])CO2e-
0.000323RH)COem, where [alpha] is the hydrogen to carbon
ratio as measured for the fuel used.
COem=Carbon monoxide concentration of the dilute exhaust
sample as measured, in ppm.
RH = Relative humidity of the dilution air, percent.
COd=Carbon monoxide concentration of the dilution air
corrected for water vapor extraction, in ppm.
COdm=Carbon monoxide concentration of the dilution air sample
as measured, in ppm.
(2) If a CO instrument which meets the criteria specified in
Sec. 86.1311 of this chapter is used and the conditioning column has
been deleted, COem must be substituted directly for
COe, and COdm must be substituted directly for
COd.
(E) MCH4 mode=Methane emissions corrected for background,
in gram per hour by mode, are calculated using the following equations:
MCH4 mode=(Vmix) (DensityCH4)
(CH4conc/10\6\) /Vf
CH4conc=CCH4e-CCH4d(1-(1/DF))
Where:
DensityCH4=Density of methane is 18.89 g/ft\3\ at 68 deg.F
(20 deg.C) and 760 mm Hg (101.3kPa) pressure.
CH4conc=Methane concentration of the dilute exhaust corrected
for background, in ppm.
CCH4e=Methane concentration in the dilute exhaust, in ppm.
CCH4d=Methane concentration in the dilution air, in ppm.
[[Page 472]]
(F) MCH3OH mode=Methanol emissions corrected for
background, in gram per hour by mode, are calculated using the following
equations:
MCH3OH mode=(Vmix)(DensityCH3OH)
(CH3OHconc/10\6\)/Vf
CH3OHconc=CCH3OHe-CCH3OHd(1-(1/DF))
CCH3OHe=((3.817)(10-2)(TEM)(((CS1
)(AVS1))+(CS2) (AVS2)))/
((PB)(VEM))
CCH3OHd=((3.817)(10-2)(TDM)(((CD1
) (AVD1))+(CD2) (AVD2)))/
((PB)(VDM))
Where:
DensityCH3OH=Density of methanol is 37.71 g/ft\3\ (1.332 kg/
m\3\), at 68 deg.F (20 deg.C) and 760 mm Hg (101.3kPa) pressure.
CH3OHconc=Methanol concentration of the dilute exhaust
corrected for background, in ppm.
CCH3OHe=Methanol concentration in the dilute exhaust, in ppm.
CCH3OHd=Methanol concentration in the dilution air, in ppm.
TEM=Temperature of methanol sample withdrawn from dilute
exhaust, deg.R.
TDM=Temperature of methanol sample withdrawn from dilution
air, deg.R.
PB=Barometric pressure during test, mm Hg.
VEM=Volume of methanol sample withdrawn from dilute exhaust,
ft \3\.
VDM=Volume of methanol sample withdrawn from dilution air, ft
\3\.
CS=GC concentration of aqueous sample drawn from dilute
exhaust, [mu]g/ml.
CD=GC concentration of aqueous sample drawn from dilution
air, [mu]g/ml.
AVS=Volume of absorbing reagent (deionized water) in impinger
through which methanol sample from dilute exhaust is drawn, ml.
AVD=Volume of absorbing reagent (deionized water) in impinger
through which methanol sample from dilution air is drawn, ml.
1=first impinger.
2=second impinger.
(G) MC2H5OH mode=Ethanol emissions corrected for
background, in gram per hour by mode, are calculated using the following
equations:
MCH3CH2OH mode=(Vmix)(DensityCH3CH2OH)
((CH3CH2OHconc/10 \6\))/Vf
CH3CH2OHconc = CCH3CH2OHe -
CCH3CH2OHd(1-(1/DF))
CCH3CH2OHd =
((2.654)(10-2)(TDM)(((CD1)(AVD1
)) + (CD2)(AVD2)))/
((PB)(VDM))
CCH3CH2OHe =
((2.654)(10-2)(TEM)(((CS1)(AV
S1)) + (CS2)(AVS2)))/
((PB)(VEM))
Where:
DensityC2H5OH=Density of ethanol is 54.23g/ft \3\ (1.915 kg/m
\3\), at 68 deg.F (20 deg.C) and 760 mm Hg (101.3kPa) pressure.
CH3CH2OHconc=Ethanol concentration of
the dilute exhaust corrected for background, in ppm.
CCH3CH2OHe=Ethanol concentration in the dilute exhaust, in
ppm.
CCH3CH2OHd=Ethanol concentration in the dilution air, in ppm.
TEM= Temperature of ethanol sample withdrawn from dilute
exhaust, deg.R.
TDM=Temperature of ethanol sample withdrawn from dilution
air, deg.R.
PB=Barometric pressure during test, mm Hg.
VEM=Volume of ethanol sample withdrawn from dilute exhaust,
ft \3\.
VDM=Volume of ethanol sample withdrawn from dilution air, ft
\3\.
CS=GC concentration of aqueous sample drawn from dilute
exhaust, [mu]g/ml.
CD=GC concentration of aqueous sample drawn from dilution
air, [mu]g/ml.
AVS=Volume of absorbing reagent (deionized water) in impinger
through which ethanol sample from dilute exhaust is drawn, ml.
AVD=Volume of absorbing reagent (deionized water) in impinger
through which ethanol sample from dilution air is drawn, ml.
1=first impinger.
2=second impinger.
(H) MCH2O mode=Formaldehyde emissions corrected for
background, in gram per hour by mode, are calculated using the following
equations:
MCH2O mode=(Vmix)(DensityCH2O)
((CH2Oconc/10 \6\)/Vf
CH2Oconc=CCH2Oe-CCH2Od(1-(1/DF))
CCH2Oe=((4.069)(10-2)(CFDE)(V
AE)(Q)(TEF))/((VSE)(PB)
CCH2Od=((4.069)(10-2)(CFDA)(VAA
)(Q)(TDF))/(VSA)(PB)
Where:
DensityCH2O=Density of formaldehyde is 35.36 g/ft \3\ (1.249
kg/m \3\), at 68 deg.F (20 deg.C) and 760 mmHg (101.3 kPa) pressure.
CH2Oconc=Formaldehyde concentration of the dilute exhaust
corrected for background, ppm.
CCH2Oe=Formaldehyde concentration in dilute exhaust, ppm.
CCH2Od=Formaldehyde concentration in dilution air, ppm.
CFDE=Concentration of DNPH derivative of formaldehyde
from dilute exhaust sample in sampling solution, [mu]g/ml.
VAE=Volume of sampling solution for dilute exhaust
formaldehyde sample, ml.
Q = Ratio of molecular weights of formaldehyde to its DNPH
derivative = 0.1429.
TEF=Temperature of formaldehyde sample withdrawn from
dilute exhaust, deg.R.
VSE=Volume of formaldehyde sample withdrawn from dilute
exhaust, ft3.
PB=Barometric pressure during test, mm Hg.
CFDA=Concentration of DNPH derivative of formaldehyde
from dilution air sample in sampling solution, [mu]g/ml.
VAA=Volume of sampling solution for dilution air
formaldehyde sample, ml.
[[Page 473]]
TDF=Temperature of formaldehyde sample withdrawn from
dilution air, deg.R.
VSA=Volume of formaldehyde sample withdrawn from dilution
air, ft3.
(I) MCH3CHO mode=Acetaldehyde emissions corrected for
background, in grams per hour by mode, are calculated using the
following equations:
MCH3CHO mode=
(Vmix)(DensityCH3CHO)((CH3CHOconc
/106)/Vf
CH3CHOconc=CCH3CHOe-CCH3CHOd(1--(1/DF))
CCH3CHOe=((2.774)(10-2)
(CADE)(VAE)(Q)(TEF))/
((VSE)(PB)
CCH3CHOd=((2.774)(10-2)
(CADA)(VAA)(Q)(TDF))/
(VSA)(PB)
Where:
Density CH3CHO=Density of acetaldehyde is 51.88 g/
ft3 (1.833 kg/m3), at 68 deg.F (20 deg.C) and
760 mmHg (101.3 kPa) pressure.
CH3CHOconc=Acetaldehyde concentration of the dilute exhaust
corrected for background, ppm.
CCH3CHOe=Acetaldehyde concentration in dilute exhaust, ppm.
CCH3CHOd=Acetaldehyde concentration in dilution air, ppm.
CADE=Concentration of DNPH derivative of acetaldehyde from
dilute exhaust sample in sampling solution, [mu]g/ml.
VAE=Volume of sampling solution for dilute exhaust
acetaldehyde sample, ml.
Q=Ratio of molecular weights of acetaldehyde to its DNPH derivative
=0.182
TEF=Temperature of acetaldehyde sample withdrawn from dilute
exhaust, deg.R.
VSE=Volume of acetaldehyde sample withdrawn from dilute
exhaust, ft3.
PB=Barometric pressure during test, mm Hg.
CADAConcentration of DNPH derivative of acetaldehyde from
dilution air sample in sampling solution, [mu]g/ml.
VAA=Volume of sampling solution for dilution air acetaldehyde
sample, ml.
TDF=Temperature of acetaldehyde sample withdrawn from
dilution air, deg.R.
VSA=Volume of acetaldehyde sample withdrawn from dilution
air, ft3.
(J) MNMHC mode=Nonmethane hydrocarbon emissions, in grams
per hour by mode.
MNMHC mode=(Vmix)(DensityNMHC)
((NMHCEconc/106))/Vf
NMHCconc=NMHCe--(NMHCd)(1-(1/DF))
NMHCe=FID HCe-(rm)(CCH4e)
NMHCd=FID HCd-(rm)(CCH4d)
Where:
DensityNMHC=Density of nonmethane hydrocarbons=16.42 g/
ft3 (0.5800 kg/m3) for 1 petroleum
diesel fuel, 16.27 g/ft3 (0.5746 kg/m3) for
2 diesel, and 16.33 for other fuels, assuming an average carbon
to hydrogen ratio of 1:1.93 for 1 petroleum diesel fuel, 1:1.80
for 2 petroleum diesel fuel, and 1:1.85 for nonmethane
hydrocarbons in other fuels at standard conditions.
NMHCconc=Nonmethane hydrocarbon concentration of the dilute
exhaust sample corrected for background, in ppm carbon equivalent (i.e.,
equivalent propane x 3).
NMHCe=Nonmethane hydrocarbon concentration of the dilute
exhaust bag sample:
FID HCe=Concentration of hydrocarbons in dilute exhaust as
measured by the FID, ppm carbon equivalent.
rm=FID response to methane.
CCH4e=Concentration of methane in dilute exhaust as
determined from the dilute exhaust sample.
NMHCd=Nonmethane hydrocarbon concentration of the dilution
air:
FID HCd=Concentration of hydrocarbons in dilute exhaust as
measured by the FID, ppm carbon equivalent.
rm=FID response to methane.
CCH4d=Concentration of methane in dilute exhaust as
determined from the dilute exhaust sample, ppm.
(4) Particulate exhaust emissions. The mass of particulate for a
test mode determined from the following equations when a heat exchanger
is used (i.e., no flow compensation), and when background filters are
used to correct for background particulate levels:
MPM mode=Particulate emissions, grams per hour by mode.
MPM mode=(WVol)(PMconc)
(1+DF)=(Vmix)(PMconc)/Vf
PMconc=PMe-PMd(1-(1/DF))
PMe=MPMe/Vsampe/10 \3\
PMd=MPMd/Vsampd/10 \3\
Where:
PMconc=Particulate concentration of the diluted exhaust
sample corrected for background, in gift \3\
MPMe=Measured mass of particulate for the exhaust sample, in
mg, which is the difference in filter mass before and after the test.
MPMd=Measured mass of particulate for the dilution air
sample, in mg, which is the difference in filter mass before and after
the test.
Vsampe=Total wet volume of sample removed from the dilution
tunnel for the exhaust particulate measurement, cubic feet at standard
conditions.
Vsampd=Total wet volume of sample removed from the dilution
tunnel for the dilution air particulate measurement, cubic feet at
standard conditions.
[[Page 474]]
DF=Dilution factor, which is the volumetric ratio of the dilution air to
the raw exhaust sample, calculated as:
[GRAPHIC] [TIFF OMITTED] TR16AP98.014
(c) Humidity calculations. (1) The following abbreviations (and
units) apply to paragraph (b) of this section:
BARO=barometric pressure (Pa).
H=specific humidity, (g H2O/g of dry air).
KH=conversion factor=0.6220 g H2O/g dry air.
Mair=Molecular weight of air=28.9645.
MH2O=Molecular weight of water=18.01534.
PDB=Saturation vapor pressure of water at the dry bulb
temperature (Pa).
PDP=Saturation vapor pressure of water at the dewpoint
temperature (Pa).
Pv=Partial pressure of water vapor (Pa).
PWB=Saturation vapor pressure of water at the wet bulb
temperature (Pa).
TDB=Dry bulb temperature (Kelvin).
TWB=Wet bulb temperature (Kelvin).
Y=Water-vapor volume concentration.
(2) The specific humidity on a dry basis of the intake air (H) is
defined as:
H=((KH) (Pv)/(BARO-Pv))
(3) The partial pressure of water vapor may be determined using a
dew point device. In that case:
Pv=PDP
(4) The percent of relative humidity (RH) is defined as:
RH=(Pv/PDB)100
(5) The water-vapor volume concentration on a dry basis of the
engine intake air (Y) is defined as:
Y=((H)(Mair)/(MH2O)=Pv/(BARO-
Pv)
(d) NOX correction factor. (1) NOX emission
rates (MNOx mode) shall be adjusted to account for the
effects of humidity and temperature by multiplying each emission rate by
KNOx, which is calculated from the following equations:
KNOx=(K)(1+(0.25(logK)2)1/2)
K=(KH)(KT)
KH=[C1+C2(exp((-0.0143)(10.714))]/
[C1+C2(exp((-0.0143)(1000H))]
C1=-8.7+164.5exp(-0.0218(A/F)wet)
C2=130.7+3941exp(-0.0248(A/F)wet)
Where:
(A/F)wet=Mass of moist air intake divided by mass of fuel
intake.
KT=1/[1-0.017(T30-TA)] for tests
conducted at ambient temperatures below 30 deg.C.
KT=1.00 for tests conducted at ambient temperatures at or
above 30 deg.C.
T30=The measured intake manifold air temperature in the
locomotive when operated at 30 deg.C (or 100 deg.C, where intake
manifold air temperature is not available).
TA=The measured intake manifold air temperature in the
locomotive as tested (or the ambient temperature ( deg.C), where intake
manifold air temperature is not available).
(e) Other calculations. Calculations other than those specified in
this section may be used with the advance approval of the Administrator.