Foss Tug Conversions Boost Power and Maneuverability

Friday, September 24, 1999
Two Foss Maritime conventional twin-screw harbor service tugs have been repowered and converted into azimuthal stern drive (ASD) vessels. The projects, involving 96 ft. sister ships, increase horsepower by 46 percent, and bollard pull by 63 percent. Vessel manueverability and pilot visibility are also dramatically enhanced. Work on Seattle-based Daniel Foss is complete with the Los Angeles-based Peter Foss scheduled to return to service in March 1999. Foss uses both vessels to provide harbor services, including ship assist, tanker escort and barge transportation. The vessels were originally designed by The Glosten Associates, Seattle, and built in the late 1970s at Main Iron Works, Houma, La. Conversion and repowering are being done at Marine Industries Northwest, Inc., (MINI) Seattle. With the repower, two electronically controlled CAT 3512B engines, each rated 1,650 bhp (1,230 bkW) at 1,600 rpm, drive two Ulstein azimuthal stern drives with skewed propellers inside Nautican high performance nozzles. The new propulsion system produces more than 90,000 lbs. of bollard pull and provides high thrust over a complete 360-degree range. To improve pilots' sight lines in all directions, the traditional pilothouse forward was removed and a new high-visibility pilothouse was placed amidships. The ASD conversions were conceived by Foss' in-house design team, with engineering support provided by Glosten and MINI. According to Ulsteain President Ewan Moir, these are some of the first Ulstein installations involving former conventional tugs. "These tugs were good candidates for conversion because they are very robust, well-built, have the correct proportions and have many years of productive service life remaining," says Don Hogue, Foss engineering manager. "Also, the existing deckhouse, stack geometry lent itself well to the installation of the new high-visibility pilothouse." Hull modifications included changes to the keel profile to provide increased lateral hull resistance and additional ballast for improved stability. Aft hull lines were re-contoured to accept the stern drive units, add buoyancy and improve performance while going astern.

Maritime Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter April 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Legal

BSEE, USCG on Sharing Information, Jt Ops

Bureau of Safety and Environmental Enforcement (BSEE) Director Brian Salerno and U.S. Coast Guard Rear Admiral Paul Thomas participated in a luncheon panel discussion

Yilport Acquires Sweden's Gavle Terminal

Turkish terminal operator Yilport Holding has gained full control of Gävle’s terminals.   Yilport Holding acquired 100% shares of Gävle Container Terminal (GCT) and Baltic Sea Gateway (BSG).

ICS Pushing For Balanced Update of York Antwerp Rules

At the Comité Maritime International (CMI) Conference, in New York this week, the International Chamber of Shipping (ICS) will be pressing to ensure that the proposed

Bulk Carrier Trends

Recent Strength in Dry Bulk Shipping to be Short-Lived

Drewry forecasts dry bulk freight rates in 2016 will be, on average, lower than in 2015, as the medium-to-long term fundamentals for dry bulk shipping will remain challenging,

Slower Demand for Larger Vessels Drags Baltic Index Lower

The Baltic Exchange's main sea freight index, tracking rates for ships carrying dry bulk commodities, fell on Thursday due to diminishing demand for larger vessels.

Maersk Returns to Liverpool

Maersk has been welcomed to the Port of Liverpool with a formal reception for its feeder vessel Antwerp. The event on April 27 was attended by Seago and Maersk representatives along with customers,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Offshore Oil Ship Electronics Ship Repair Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0747 sec (13 req/sec)