Crowley Maritime Corp.’s Seattle-based naval architecture and engineering firm, Jensen Maritime, has designed a Tier IV Federal air emissions standards-compliant tug that features a selective catalytic reduction (SCR) system to reduce nitrogen oxide (NOx) emissions to required standards.
In the United States Federal emissions standards are controlled as part of a law named the clean air act.
The high performance, multipurpose tractor tug has been designed for Vessel Chartering LLC and is being built by JT Marine of Vancouver, Wash. This is the third tugboat designed by Jensen Maritime with engines meeting the stringent Tier IV NOx emission reduction requirement.
The tug’s two 3,385-horsepower Caterpillar 3516 engines are designed to meet the federal Tier IV standard by using an SCR system that cleans the tug’s exhaust gases after they have left the engines. It can carry up to 4,500 gallons of urea, which is used for treatment of the main engine exhausts via the SCR system.
“The development of the Tier IV engines for this tug demonstrates our commitment to innovative, environmentally friendly design while continuing to deliver powerful, high-quality performance,” said Johan Sperling, vice president, Jensen Maritime.
The tug is planned for delivery in the second quarter of 2017 to Vessel Chartering LLC., a wholly owned division of Baydelta Navigation Ltd.
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