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Evaporative Emission Standards for Boats - PowerPoint PPT Presentation

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Evaporative Emission Standards for Boats. Presented By: John McKnight Director of Environmental & Safety Compliance December 2008. Overview of new program Evaporative emission types New Standards Program details Small businesses Certification Questions. Outline. Final Rule.

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Evaporative emission standards for boats

Evaporative EmissionStandards for Boats

Presented By:John McKnightDirector of Environmental & Safety ComplianceDecember 2008


Overview of new program

Evaporative emission types

New Standards

Program details

Small businesses




Final rule
Final Rule

  • On September 4, 2008, EPA Administrator Steve Johnson signed, into law, new exhaust and evaporative emission standards for spark-ignition marine engines and vessels.

  • These standards apply only to new engines and vessels sold for use in the United States.

  • The standards will help reduce harmful health effects of ozone and carbon monoxide from these products.

Final standards overview
Final Standards: Overview

  • HC+NOx exhaust emission standards for SI marine engines are similar in stringency to existing standards in California

  • New CO exhaust emission standards for all SI marine engines

  • New Not-to-Exceed provisions

  • New evaporative emission standards

Evaporative emission standards for boats

Venting emissions

(diurnal, hot soak, running loss)



(fuel tank, hoses, other)

Highway evap standards
Highway Evap Standards

Three decades of automotive evaporative emission control

(full vehicle test/standards)

Nonroad equipment are just now becoming subject to evaporative emission control

Existing nonroad standards

Component based standards

Fuel and tank permeation

Component test for diurnal control

Design-based certification

Existing standards

Large SI equipment (2007)

Recreational vehicles (2008)

Portable gas cans (2009)

Existing Nonroad Standards

New standards
New Standards

SI Marine

  • Portable tanks

    • Tank permeation

    • Self-sealing vent

  • Vessels

    • Hose and tank permeation

    • Diurnal emissions

    • Refueling spillage

      Small SI as well

    • Hose and tank permeation

    • Running loss

Marine evap standards
Marine Evap Standards

a2011 for primer bulbs. Phase-in for under cowl fuel lines, by length, on OB engines: 30% 2010, 60% 2011, 90% 2012, 100% 2015.

b Design standard.

c Fuel tanks installed in nontrailerable boats (> 26 ft. in length or >8.5 ft. in width) may meet a standard of 0.16 g/gal/day over an alternative test cycle.

d The standard is effective July 31, 2011. For boats with installed fuel tanks, this standard is phased-in 50%/100% over the first two years. As an alternative, small manufacturers may participate in a diurnal allowance program.

Program details
Program Details






Small Business Provisions




Fuel line permeation
Fuel Line Permeation

  • Fuel line

    • 15 g/m2/day, 2009

      • Fuel CE10, 23°C

    • Boat and engine hose

      • Phase-in for under cowl fuel line

    • Primer bulbs, 2011

  • Vent and fill lines

    • Standards do not apply unless hose will hold standing fuel

  • Fuel line manufacturers will certify

Technical approaches
Technical Approaches

  • Straight-run hose

    • Low permeation hose widely available

    • Fluoroelastomer/fluoroplastic barriers

    • SAE J1527 includes specification for 15 g/m2/day hose

  • Molded hose and other rubber components

    • Fluoroelastomer construction

    • Alternative primer bulb products



barrier layer


Fuel tank permeation
Fuel Tank Permeation

  • 1.5 g/m2/day

    • E10 fuel, 28°C

    • Preconditioning

      • Fuel soak

      • Durability testing

  • Design-based certification

    • Metal tanks

    • Automotive type multi-layer tanks

  • Tank manufacturer will certify

Technical approaches1

Multi-layer constructions

Alternative materials

Barrier treatments

Barrier platelets



Technical Approaches

Diurnal standards
Diurnal Standards

  • Portable fuel tanks

    • Self-sealing valve

  • Installed tanks

    • Trailerable boats (<26 ft)

      • 0.40 g/gal/day

      • 25.6-32.2°C

    • Nontrailerable boats

      • 0.16 g/gal/day

      • 27.6-30.2°C

  • Tank manufacturer will certify

Technical approaches2

Design-based certification

Seal tank (up to 1.0 psi)

Can use pressure mitigation (e.g. bladder)

Passive-purge carbon canister

Prevent fuel from entering canister

Carbon and canister specifications

Technical Approaches


  • Fuel nozzle standards

    • Marinas must use standard nozzles whenever they replace existing nozzles or install new ones

    • Same to those already used for motor vehicle pumps

      • Standardized dimensions

      • Automatic shut-off

  • System integration

    • Fuel systems should be designed to allow flow to nozzle for automatic shut-off

    • Will help with carbon canister installation designs and reduce spillage

System integration
System Integration

  • Industry consensus standards

    • SAE J1527 addresses hose permeation

    • ABYC H24 potential vehicle for specifying best practices for fuel system designs

    • NMMA certification

  • Canister installation standards

    • Industry is developing canister installation practices in context of EPA & USCG standards

    • ABYC is assessing fuel/air separators and fuel system designs for spillage control

How to download the rule

1. Go to http://www.epa.gov/otaq/marinesi.htm

How to Download the Rule

2. Under “Regulations and Guidance,” click on Final Rule.

How to download the rule1
How to Download the Rule

3. The Final Rule will be a PDF document.

4. Go to Federal Register page 59298, which is actually page 266 in the document.

Other resources

jmcknight@nmma.org or 202-737-9757

Three communication programs in late January 2009

Engine Workshop

Component Manufacturer Workshop

Web based workshop for boat builders

Other Resources