New US EPA Tier 4 ship-assist tugs will be built for Moran Towing
Moran Towing Corp has ordered tugs that meet strict environmental standards from Washburn & Doughty Shipyard of East Boothbay, Maine, US. These ship-assist and escort tugboats will be built to ABS class, US Coast Guard subchapter M regulation and to comply with US Environmental Protection Agency (EPA)’s Tier 4 emissions requirements.
Washburn & Doughty will use escort tug designs by Crowley Maritime Corp subsidiary Jensen Maritime Consultants for these newbuildings. They were designed for escort performance and manoeuvrability in US east coast and US Gulf ports.
These will have an overall length of 26 m, breadth of 11 m and depth of 4.6 m. Moran’s new tugs will deliver more than 3,750 kW of power. They will be equipped with two Caterpillar 3512E, EPA Tier 4 diesel engines and Rolls Royce Z-drive propulsion units with a bollard pull of around 61 tonnes.
Jensen included a deep skeg on the forward section of the hull design to improve performance during escort work.
But the skeg will remain open at the aft end for better manoeuvrability. This skeg design also provides a more stable platform when these tugs are underway, minimising rolling due to the seaway.
These tugs will have large-machinery removal hatches on the main deck and deck house for easy removal of equipment from the engineroom.
A Markey escort hawser winch will be on the fore deck, and a Markey H-bitt and hydraulic capstan on the aft for towing and line handling. There will be accommodation for six crew members in four rooms.