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Emission Standards Reference Guide

Federal Marine Compression-Ignition (CI) Engines -- Exhaust Emission Standards

Category a, b Tier Displacement (L/cylinder) Powerc
(kW)
Speed (rpm) Model Year NOx (g/kW
-hr)
HC (g/kW
-hr)
HC
+NOx d
(g/kW-hr)
PM (g/kW
-hr)
CO (g/kW
-hr)
Useful Lifee
(years/hours)
Waranty Periodf
(years/hours)
C1 Commercial 1 ≥ 2.5 ≥ 37 rpm < 130 2004h 17.0 - - - - 10 / 10,000 5 / 5,000
130 ≤rpm < 2000 45.0 x N-0.20 i - - - -
rpm ≥2000 9.8 - - - -
2 disp
< 0.9
≥ 37 - 2005h - - 7.5 (ABT) 0.40 (ABT) 5.0 10 / 10,000 5 / 5,000
0.9 ≤
disp
< 1.2
all - 2004 h - - 7.2 (ABT) 0.30 (ABT) 5.0
1.2 ≤
disp
< 2.5
- 2004 h - - 7.2 (ABT) 0.20 (ABT) 5.0
2.5 ≤
disp
< 5.0
- 2007 h - - 7.2 (ABT) 0.20 (ABT) 5.0
C1 Commercial & Recreational 1 ≥ 2.5 ≥ 37 rpm
<
130
2004 17 - - - - 10/ 1,000 5 / 500
130 ≤ rpm < 2000 45.0 x N-0.20 i - - - -
rpm ≥ 2000 9.8 - - - -
2 disp
< 0.9
≥ 37 - 2007 - - 7.5 (ABT) 0.40 (ABT) 5.0 10 / 1,000 5 / 500
0.9 ≤
disp
< 1.2
all - 2006 - - 7.2 (ABT) 0.30 (ABT) 5.0
1.2 ≤
disp
< 2.5
- 2006 - - 7.2 (ABT) 0.20 (ABT) 5.0
2.5 ≤
disp
< 5.0
- 2009 - - 7.2 (ABT) 0.20 (ABT) 5.0
C1 Commercial
& Recreational
< 75 kW
3 < 0.9 < 8 - 2009+ - - 7.5 (ABT) 0.40 (ABT) 8.0 5 / 3,000 10/1,000
for
CI
Recrea-
tional
2.5 / 1,500 10/ 500
for
CI
Recrea-
tional
8 ≤ kW < 19 - 2009+ - - 7.5 (ABT) 0.40 (ABT) 6.6
19 ≤ kW < 37 - 2009-2013 - - 7.5 j (ABT) 0.30 j (ABT) 5.5 7 / 5,000 3.5 / 2,500
- 2014+ - - 4.7 j (ABT) 0.20 (ABT) 5.0
37 ≤ kW < 75 - 2009-2013 - - 7.5 j (ABT) 0.30 j (ABT) 5.0 10 / 10,000 5 / 5,000
- 2014+ - - 4.7 j (ABT) 5.0
C1 Commercial Engines with ≤ 35 kW/L power density k 3 l < 0.9 - - 2012+ - - 5.4 (ABT) 0.14 (ABT) 8.0 for < 8 kW
6.6 for 8 ≤ kW < 19
5.5 for 19 ≤ kW < 37
5.0 for ≤ 37 kW
5 / 3,000
for
commercial
engines
< 19 kW
7 / 5,000
for
commercial
engines
19 ≤ kW < 37
10 / 10,000
for C1
Commercial
≤ 37 kW
2.5 / 1,500
for
commercial
engines
< 19 kW
3.5 / 2,500
for
commercial
engines
19 ≤ kW < 37
5 / 5,000
for C1
Commercial
≤ 37 kW
0.9 ≤
disp
< 1.2
All - 2013+ - - 5.4 (ABT) 0.12 (ABT)
1.2 ≤
disp
< 2.5
< 600 - 2014-2017 - - 5.6 (ABT) 0.11 (ABT)
- 2018+ - 0.10 (ABT)
≥ 600 - 2014+ - - 5.6 (ABT) 0.11 (ABT)
2.5 ≤
disp
< 3.5
< 600 - 2013-2017 - - 5.6 (ABT) 0.11 (ABT)
- 2018+ - 0.10 (ABT)
≥ 600 - 2013+ - - 5.6 (ABT) 0.11 (ABT)
3.5 ≤
disp
< 7.0
< 600 - 2012-2017 - - 5.8 (ABT) 0.11 (ABT)
- 2018+ - 0.10 (ABT)
≥ 600 - 2012+ - - 5.8 (ABT) 0.11 (ABT)
C1 Commercial engines with > 35 kW/L power density & All Recreational Engines k 3 l < 0.9 ≥ 75 - 2012+ - - 5.8 (ABT) 0.15 (ABT) 8.0 for < 8 kW
6.6 for 8 ≤ kW < 19
5.5 for 19 ≤ kW < 37
5.0 for ≥ 37 kW
5 / 3,000
for
commercial
engines
< 19 kW
7 / 5,000
for
commercial
engines
19 ≤ kW < 37
10 / 10,000
for C1
Commercial
≥ 37 kW
10 / 1,000
for CI
Recreational
2.5 / 1,500
for
commercial
engines
< 19 kW
3.5 / 2,500
for
commercial
engines
19 ≤ kW < 37
5 / 5,000
for C1
Commercial
≥ 37 kW
5 / 500
for CI
Recreational
0.9 ≤
disp
< 1.2
All - 2013+ - - 5.8 (ABT) 0.14 (ABT)
1.2 ≤
disp
< 2.5
- 2014+ - - 5.8 (ABT) 0.14 (ABT)
2.5 ≤
disp
< 3.5
- 2013+ - - 5.8 (ABT) 0.12 (ABT)
3.5 ≤
disp
< 7.0
- 2012+ - - 5.8 (ABT) 0.11 (ABT)
C1 Commercial > 600 kW 4m All 600
≤ kW
< 1,400
- 2017+ 1.8 (ABT) - 0.19 HCn 0.04 (ABT) 5.0 10 / 10,000 5 / 5,000
All 1,400
≤ kW
< 2,000
- 2016+ 1.8 (ABT) - 0.19 HCn 0.04 (ABT)
All 2,000
≤ kW
< 3,700
- 2014+ 1.8 (ABT) - 0.19 HCn 0.04 (ABT)
< 7.0 ≥ 3,700 - 2014-2015 1.8 (ABT) - 0.19 HCn 0.12 (ABT)
- 2016+ 1.8 (ABT) - 0.19 HCn 0.06 (ABT)
C2 1 ≥ 2.5 ≥ 37 rpm < 130 2004 17.0 - - - - 10 / 20,000 5 / 10,000
130 ≤ rpm < 2,000 45.0 x N-0.20 i - - - -
rpm ≥ 2,000 9.8 - - - -
2 5.0 ≤
disp
< 15.0
all - 2007 - - 7.8 (ABT) 0.27 (ABT) 5.0 10 / 20,000 5 / 10,000
15.0 ≤
disp
< 20.0
< 3,300 - - - 8.7 (ABT) 0.50 (ABT) 5.0
15.0 ≤
disp
< 20.0
≥ 3,300 - - - 9.8 (ABT) 0.50 (ABT) 5.0
20.0 ≤
disp
< 25.0
all - - - 9.8 (ABT) 0.50 (ABT) 5.0
25.0 ≤
disp
< 30.0
all - - - 11.0 (ABT) 0.50 (ABT) 5.0
3o,p 7.0 ≤
disp
< 15.0
< 2,000 - 2013+ - - 6.2 (ABT) 0.14 (ABT) 5.0 10 / 20,000 5 / 10,000
2,000 ≤ kW < 3,700 - - - 7.8 (ABT) 0.14 (ABT) 5.0
15.0 ≤
disp
< 20.0
< 2,000 - 2014+ - - 7.0 (ABT) 0.34 (ABT) 5.0
20.0 ≤
disp
< 25.0
< 2,000 - - - 9.8 (ABT) 0.27 (ABT) 5.0
25.0 ≤
disp
< 30.0
< 2,000 - - - 11.0 (ABT) 0.27 (ABT) 5.0
4m,p All 600 ≤ kW < 1,400 - 2017+ 1.8 (ABT) - 0.19 HCn 0.04 (ABT) 5.0 10 / 20,000 5 / 10,000
All 1400 ≤ kW < 2,000 - 2016+ 1.8 (ABT) - 0.19 HCn 0.04 (ABT)
All 2,000 ≤ kW < 3,700q - 2014+ 1.8 (ABT) - 0.19 HCn 0.04 (ABT)
< 15.0 ≥ 3,700 - 2014-2015 1.8 (ABT) - 0.19 HCn 0.12 (ABT)
15.0 ≤
disp
< 30.0
- 2014-2015 1.8 (ABT) - 0.19 HCn 0.25 (ABT)
All - 2016+ 1.8 (ABT) - 0.19 HCn 0.06 (ABT)
C3 1 ≥30.0 All rpm < 130 2004 17.0 - - - - 3 / 10,000 3 / 10,000
130 ≤ rpm < 2,000 45.0 × N-0.20 i - - - -
rpm ≥ 2,000 9.8 - - - -
2 ≥30.0 All rpm < 130 2011 14.4 2.0 - - 5.0 3 / 10,000 3 / 10,000
130 ≤ rpm < 2,000 44.0 × N-0.23 i - -
rpm ≥ 2,000 7.7 - -
3 ≥ 30.0 All rpm < 130 2016 3.4 2.0 - - 5.0 3 / 10,000 3 / 10,000
130 ≤ rpm < 2,000 9.0 × N-0.20 i - -
rpm ≥ 2,000 2.0 - -

 

Notes:

a  For Tiers 1 and 2, Category 1 (C1) marine engines are greater than or equal to 37 kilowatts (kW) and have a displacement less than 5.0 liters per cylinder (L/cylinder); Category 2 (C2) marine engines have a displacement greater than or equal to 5.0 L/cylinder and less than 30 L/cylinder; and Category 3 (C3) marine engines have a displacement greater than or equal to 30.0 L/cylinder. For Tiers 3 and 4, Category 1 represents engines up to 7 L/cylinder displacement; and Category 2 includes engines from 7 to 30 L/cylinder.  The definition of Category 3 marine engines remains the same.

b  Tiers 1 and 2 for marine engines less than 37 kW are subject to the same emission standards as for land-based engines. See Table 1 in 40 Code of Federal Regulations (CFR) Part 89.112 and 40 CFR Part 89.104.

c  For Tiers 1 and 2, this refers to the rated power; for Tiers 3 and 4, this refers to the maximum engine power.

d   Total hydrocarbon (THC) plus nitrogen oxides (NOx) for Tier 2 standards.

e  Useful life is expressed in hours or years, whichever comes first. For Tiers 3 and 4, a longer useful life in hours for an engine family must be specified if either:1)) the engine is designed, advertised, or marketed to operate longer than the minimum useful life; or 2) the basic mechanical warranty is longer than the minimum useful life.

f  Warranty period is expressed in years and hours, whichever comes first.

g  For Tiers 3 and 4, there are no evaporative emission standards for diesel-fueled engines, or engines using other nonvolatile or nonliquid fuels (e.g., natural gas). If an engine uses a volatile liquid fuel, such as methanol, the engine's fuel system and the vessel in which the engine is installed must meet the evaporative emission requirements of 40 Code of Federal Regulations (CFR) Part 1045 that apply with respect to spark-ignition engines. Manufacturers subject to evaporative emission standards must meet the requirements of 40 CFR 1045.112 as described in 40 CFR 1060.1(a)(2).

h  Indicates the model years for which the specified standards start.

i  N is the maximum test speed of the engine in revolutions per minute (rpm).

j  Manufacturers of Tier 3 engines greater than or equal to 19 kW and less than 75 kW with displacement below 0.9 L/cylinder may alternatively certify some or all of their engine families to a particulate matter (PM) emission standard of 0.20 grams per kilowatt-hour (g/kW-hr) and a NOx+HC emission standard fo 5.8 g/kW-hr for 2014 and later model years.

k  The applicable Tier 2 NOx+HC standards continue to apply instead of the Tier 3 values for engines at or above 2000 kW.

l  These Tier 3 standards apply to Category 1 engines below 3700 kW except for recreational marine engines at or above 3700 kW (with any displacement), which must meet the Tier 3 standards specified for recreational marine engines with a displacement of 3.5 to 7.0 L/cylinder.

m  The following provisions are optional: 1)Manufacturers may use NOx credits to certify Tier 4 engines to a NOX+HC emission standard of 1.9 g/kW-hr instead of the NOX and HC standards. See 40 CFR 1042.101(a)(8)(i) for more details. 2) For engines below 1000 kW, manufacturers may delay complying with the Tier 4 standards until October 1, 2017. 3) For engines at or above 3700 kW, manufacturers may delay complying with the Tier 4 standards until December 31, 2016.

n  The Tier 4 standard is for HC (not HC+NOx) in g/kW-hr.

o  These Tier 3 standards apply to Category 2 engines below 3700 kW; no Tier 3 standards apply for Category 2 engines at or above 3700 kW, although there are Tier 4 standards that apply.

p  An alternative set of Tier 3 and Tier 4 standards for PM, NOx, and HC are available for Category 2 engines at or above 1400 kW, but must be applied to all of a manufacturer's engines in a given displacement category in model years 2012 through 2015.

Tier Maximum engine power Model year PM
(g/kW-hr)
NOx
(g/kW-hr)
HC
(g/kW-hr)
3 kW ≥ 1400 2012-2014 0.14 7.8 NOx+HC
4 1400 ≤ kW < 3700 2015 0.04 1.8 0.19
kW ≥ 3700 2015 0.06 1.8 0.19

q  Interim Tier 4 PM standards apply for 2014 and 2015 model year Category 2 engines with per-cylinder displacement at or above 15.0 liters: 0.34 g/kW-hr for engines 2000 = kW < 3000, and 0.27 g/kW-hr for engines 3300 = kW < 3700.

Code of Federal Regulations (CFR) Citations:
  • 40 CFR 89.104 = Tier 1 and Tier 2 useful life & warranty period for marine CI engines less than 37 kW
  • 40 CFR 89.112 = Tier 1 and Tier 2 emission standards for marine CI engines less than 37 kW
  • 40 CFR Part 89, Subpart E = Tier 1 and Tier 2 test procedures for marine CI engines less than 37 kW
  • 40 CFR 94.8 = Tier 1 standards for C3 engines; also, Tier 1 and Tier 2 emission standards for C1 and C2 engines
  • 40 CFR 94.9 = Useful life values corresponding to the standards in §94.8
  • 40 CFR 94.10 = Warranty periods corresponding to the standards in §94.8
  • 40 CFR Part 94, Subpart B = Test procedures for measuring emissions relative to the emission standards in §94.8
  • 40 CFR 1042.101 = Tier 3 and Tier 4 exhaust emission standards and useful life for C1 and C2 engines
  • 40 CFR 1042.104 = Tier 2 and Tier 3 exhaust emission standards and useful life for C3 engines
  • 40 CFR 1042.107 = Evaporative emission standards for marine CI engines using methanol or any other volatile liquid fuel
  • 40 CFR 1042.120 = Warranty periods corresponding to the standards in 40 CFR Part 1042
  • 40 CFR Part 1042, Subpart F = Test procedures for measuring emissions relative to the emission standards in 40 CFR Part 1042

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