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34588

Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations TABLE 5 OF 1066.1005OTHER ACRONYMS AND ABBREVIATIONSContinued Acronym
Meaning
HEV
HFET
HLDT
HPLC
IBR
LA92
MDPV
NIST
NMC
PDP
PHEV
PM
RESS
ppm
SAE
SC03
SEA
SFTP
SI
SSV
UDDS
US06
U.S.C.
WWV

hybrid electric vehicle, including plug-in hybrid electric vehicles.
highway fuel economy test.
heavy light-duty truck.
high pressure liquid chromatography.
incorporated by reference.
Los Angeles 1992 driving schedule.
medium-duty passenger vehicle.
National Institute for Standards and Technology.
nonmethane cutter.
positive-displacement pump.
plug-in hybrid electric vehicle.
particulate matter.
rechargeable energy storage system.
parts per million.
Society of Automotive Engineers.
air conditioning driving schedule.
selective enforcement audit.
Supplemental Federal Test Procedure.
International System of Units.
subsonic venturi.
urban dynamometer driving schedule.
aggressive driving schedule.
United States Code.
NIST radio station call sign.

f Densities of chemical species. This part uses the following densities of chemical species:

TABLE 6 OF 1066.1005DENSITIES OF CHEMICAL SPECIES
Symbol
Quantity a b
g/m3

rCH4
rCH3OH
rC2H5OH
rC2H4O
rC3H8
rC3H7OH
rCO
rCO2
rHC-gas
rCH2O
rHC-liq
rNMHC-gas
rNMHC-liq
rNMHCE-gas
rNMHCE-liq
rNOx
rN2O
rTHC-liq
rTHCE-liq

density of methane
density of methanol
C1-equivalent density of ethanol
C1-equivalent density of acetaldehyde
density of propane
C1-equivalent density of propanol
density of carbon monoxide
density of carbon dioxide
effective density of hydrocarbongaseous fuel c
density of formaldehyde
effective density of hydrocarbonliquid fueld
effective density of nonmethane hydrocarbongaseous fuel c
effective density of nonmethane hydrocarbonliquid fuel d
effective density of nonmethane equivalent hydrocarbongaseous fuel c
effective density of nonmethane equivalent hydrocarbonliquid fuel d
effective density of oxides of nitrogen e
density of nitrous oxide
effective density of total hydrocarbonliquid fuel d
effective density of total equivalent hydrocarbonliquid fuel d

666.905
1332.02
957.559
915.658
611.035
832.74
1164.41
1829.53
see 3
1248.21
576.816
see 3
576.816
see 3
576.816
1912.5
1829.66
576.816
576.816

g/ft3
18.8847
37.7185
27.1151
25.9285
17.3026
23.5806
32.9725
51.8064
see 3
35.3455
16.3336
see 3
16.3336
see 3
16.3336
54.156
51.8103
16.3336
16.3336

are given at 20 C and 101.325 kPa.
for all hydrocarbon containing quantities are given in g/m3-carbon atom and g/ft3-carbon atom.
c The effective density for natural gas fuel and liquefied petroleum gas fuel are defined by an atomic hydrogen-to-carbon ratio, a, of the hydrocarbon components of the test fuel. rHCgas = 41.5712.011 + a1.008.
d The effective density for gasoline and diesel fuel are defined by an atomic hydrogen-to-carbon ratio, a, of 1.85.
e The effective density of NO is defined by the molar mass of nitrogen dioxide, NO .
X 2
a Densities b Densities
lotter on DSK11XQN23PROD with RULES2

Authority: 42 U.S.C. 74017671q.

PART 1068GENERAL COMPLIANCE
PROVISIONS FOR HIGHWAY, STATIONARY, AND NONROAD
PROGRAMS

394. Amend 1068.1 by revising paragraph a and removing and reserving paragraph d2 to n reads as follows:

393. The authority citation for part 1068 continues to read as follows:

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1068.1

Does this part apply to me?

a The provisions of this part apply to everyone with respect to the engine and equipment categories as described in this paragraph a. The provisions of this part apply to everyone, including owners, operators, parts manufacturers, and persons performing maintenance.

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