DRAFT. Waiver from Tier 4 Emission Standards for Marine Diesel Engines (Renewal)

EPA adopted the Tier 4 marine diesel engine standards in June 2008, under the authority of the Clean Air Act (73 FR 37096). The Tier 4 standards were phased in, with an effective date beginning in 2016 through 2018 for most engines. In August 2020, EPA amended those regulations in response to industry concerns about the availability of suitable Tier 4 certified engines for installation in certain kinds of high-speed vessels. The amendments provided focused relief for qualifying engines and vessels in two phases, depending on engine and vessel size. Builders of qualifying vessels were required to submit to EPA information describing their need for regulatory relief and demonstrating that their vessels met the size and power conditions. As part of the Phase 2 relief, EPA also adopted a waiver provision that can be applied for, if necessary, beginning in 2024, if suitable engines continue to be unavailable; this waiver requires the vessel builder to submit an application which would be reviewed by EPA before issuing the waiver. This information collection request renewal covers the reporting burden associated with applying for the waiver for vessels meeting the criteria for Phase 2 relief.

The latest form for DRAFT. Waiver from Tier 4 Emission Standards for Marine Diesel Engines (Renewal) expires 2029-01-31 and can be found here.