Tier 4

Tugboat Argena

Crowley to charter in powerful Tier IV tug

Crowley Maritime’s ship assist and escort services group has agreed to charter its third Tier IV ship assist tug, Athena. Athena follows sister ships Hercules and Apollo from builder Diversified Marine and

EPA logo

EPA proposes amendments to Tier 4 regs

The U.S. Environmental Protection Agency (EPA) is proposing to amend the national marine diesel engine program to provide relief provisions to address concerns associated with finding and installing certified Tier 4 marine