Above, from left to right: John Dane, President & CEO, Trinity Offshore, LLC; Bob Somerville, Chairman & CEO, American Bureau of Shipping; Robert Allan, Executive Chairman of the Board, Robert Allan Ltd.; Barry Snyder, President, Signet Maritime Corporation; and John Colle, President, Colle Towing Company.
April 27, 2010
Colle Maritime orders LNG escort tugs
Trinity Yachts' subsidiary Trinity Offshore, Gulfport, Miss., is to build two RAstar 3100 terminal support/escort tugs for Colle Maritime Company.
The tugs will be built entirely under cover at Trinity Offshore’s 60-acre facility in Gulfport, which is shared with Trinity Yachts. Building the tugs under cover will ensure the highest quality standards are met and an on time delivery achieved.
Colle Maritime, a joint venture between Signet Maritime Corporation and Colle Towing Company, is building the tugs to fulfill a a twenty-year contract to provide marine support services to Angola LNG Supply Services (ALSS) in the Port of Pascagoula, Miss.
Designed by Robert Allan Ltd. of Vancouver, B.C., the tugs will each provide 80 tonnes of bollard pull and will be built to ABS XA1 Towing and Escort Service, Fire Fighting Vessel Class 1 (Fi-Fi 1), and XAMS Standards.
They will be 30.5 m long with a 12.2 m beam at deck and a molded depth of 5.5 m. The operating draft is 5.2 m.
Main engines will be twin Caterpillar Model C175-16 diesels, each rated at 2,550 kW (3,417 BHP) at 1,800 rpm. These drive a pair of Rolls-Royce model US 255 Z-drives, with 2,800 mm OD controllable pitch propellers. The combination will deliver 80 tonnes BP ahead and over 75 tonnes astern.
The unique hull form of the RAstar class has demonstrated at both model and full scale vastly improved escort performance and sea-keeping capability in comparison to more conventional standard tug hull shapes. Tests have proven conclusively that the RAstar hull provides roll motion reductions of at least 50% and roll acceleration reductions of at least 60% in comparison to typical common tug shapes. This translates into less stress and fatigue for the crew. are obvious. According to Robert Allan, "the crew of a RAstar tug will stay alert and focused on their work in conditions twice as severe as on most other tugs of comparable size."