Ava M McAllister boosts McAllister Towing’s escort and emergency response capabilities on the US east coast
It is one of a new series of high-performance and low-emissions escort and rescue tugs Eastern Shipbuilding Group is building for one of the biggest tug owners in the US.
This tugboat was designed as a Z-drive vessel by Jensen Maritime Consultants and built to ABS class for ice-class, A1 towing and escort tug notations. It also has a US Coast Guard Subcharter-M certificate of inspection.
Ava M McAllister a new breed of escort tug designed to service ultra-large container ships and very large crude carriers, docking and unberthing at US east coast terminals.
It has low sulphur and nitrogen oxide emissions and more than meets the requirements for the US Environmental Protection Agency (EPA) Tier 4 compliance, having EPA Tier 4-certified marine diesel engines that power Z-drives with fixed pitch propellers.
Eastern built Ava M McAllister at the Allanton shipbuilding facility and delivered it to McAllister Towing on 31 March 2019. This 30.5-m tug has 12.1 m breadth and 5 m hull depth. It has total power of 5,050 kW, which comes from two Caterpillar 3516E diesel main engines that each develop 2,525 kW of power at 1,800 rpm.
These drive two Schottel Rudderpropeller SRP-510 Z-drives. Linked to the engines are two Lufkin MV1600S reduction gears with 2:1 reduction.
Ava M McAllister has three main Caterpillar C7.1 turbocharged generators, each rated at 118 kW at 1,800 rpm.
On board there is a FiFi1 fire-fighting system for the emergency response and rescue services that are part of this tug’s operational requirements. There are two FFS model 300M monitors that each deliver 1,500 gallons of water and foam per minute.
These are fed by a SEP150x200HD fire pump that was also supplied by FFS. Power to this system comes from a Caterpillar C9.3 marine auxiliary diesel engine that is EPA Tier 3-compliant and rated at 280 kW at 1,800 rpm.
Ava M McAllister has a Markey Machinery series DEPC-42-40 single-drum tow winch mounted on its stern. Markey Machinery also supplied a DEPCF-52-75 single-drum hawser winch for the stern.
Ava M McAllister is the third of four tugs of this series built for McAllister Towing. The first, Brian McAllister, was built and completed by Horizon Shipbuilding in Q3 2017. The second, Rosemary McAllister, was built by Eastern and entered service in June 2018. The fourth tug of the series, Capt Jim McAllister, is being outfitted after it was launched on 19 March 2019.
In addition, McAllister Towing ordered a new tug from Washburn & Doughty shipyard in Maine, USA, for harbour and terminal operations, escort duties, coastal towing and emergency response.
This azimuth stern drive (ASD) tug will have a free running speed of more than 14 knots and a bollard pull of around 82 tonnes.
It will have a pair of Caterpillar CAT 3516 engines, which will develop 2,525 kW of power at a speed of 1,800 rpm. Each EPA Tier 4-compliant engine will drive a Schottel SRP 490 Rudderpropeller, with a 280-cm fixed pitch propeller.
Ava M McAllister particulars
Owner: McAllister Towing
Builder: Eastern Shipbuilding
Length, oa: 30.5 m
Breadth: 12.1 m
Hull depth: 5 m
Total power: 5,050 kW
Main engines: 2 x Caterpillar 3516E
Propulsion: 2 x Schottel SRP-510 Z-drives
Gensets: 3 x Caterpillar C7.1
Fire-fighting: FFS SEP150x200HD fire pump
Winches: Markey Machinery