What size market will offshore wind farms create for the U.S. marine industry?

Quite substantial


February 20, 2010

Damen introduces Stan Tug 1205

The Tugs & Workboats project team at Damen Shipyards, Gorinchem, the Netherlands, has been taking a fresh look at he smaller tugs and workboats in the long-running Stan Tug series. After careful studies and market research the Pushy Cat 1204 series and the Stan Tug 1404 are being replaced by one new design, the Damen Stan Tug 1205.

The Stan Tug 1205 design benefits from the knowledge and experience gained while producing Damen's new Stan Tug 1606 and Stan Tug 1907. Both were developed from earlier successful vessels built by Damen in large numbers. Many features of the Stan Tug 1606 in particular have been incorporated in the new tug/workboat. The design process included: hull design, involving full scale testing and calculations for structural strength, fatigue, natural frequencies and wave profile; optimization of the propulsion system; noise levels and speed and bollard pull performance.

The resulting Stan Tug 1205 has evolved as a small, very compact and powerful vessel with clean lines and many distinctive features in common with its larger sisters.

In its basic form the tug/workboat is designed to carry out towing, mooring, transportation of passengers and pilotage duties. The first vessel was completed in late 2009 and has been subjected to extensive trials and testing all of which confirmed and in many cases exceeded expectations.

The Stan Tug 1205 is a twin-screw vessel, measuring 13.08 m in length overall, with a maximum beam of 5.28 m, a depth (at sides) of 2.30 m an approximate draft (aft) of 2.00 m and a displacement of approximately 55 tonnes. Under Bureau Veritas rules the vessel is classed 1+HULL. MACH, Seagoing launch.

An all welded steel hull is of rugged single chine construction using 10mm thick plate in the sides and bottom and a 15mm sheerstrake. The hull form is based on that of the Stan Tug 1606 and incorporates a heavily built push knee in the bow and a smooth water flow to the propellers and nozzles. Incorporated in the hull structure are internal tanks capable of a accepting 5.5 cu/m of fuel, 0.35 cu/m of fresh water, 0.32 cu/m of sewage and 0.30 cu/m of bilge water.

The decks, fore and aft, have been kept as clear of obstructions as possible to provide a safe working environment - with maximum available space. Substantial bulwarks of 1m in height around the fore deck are reduced in height aft and incorporate access doors. Bulwark height can be chosen to suit operating conditions and national regulations. Mooring bits, the engineroom hatch and the exhaust outlet housings are neatly built in and tank vents, and other necessary protrusions, are guarded to prevent fouling. In common with all of the smaller Damen workboats, lifting eyes are provided on deck in four locations. The design of all deck fittings is intended to improve safety and simplify maintenance.

A single anchor is housed beneath the starboard bow and handled by a very compact electrically driven windlass operating on a 24 volt supply.

Fendering is intended to afford good protection when towing and working alongside other craft. The push knee is heavily fendered with cylindrical rubber moldings and a "D" section molding is fitted all round the vessel at deck level. Towing gear comprises 'H' style towing bitts, carrying a Mampaey quick release tow hook with a safe working load of 15 tonnes.

The Damen Stan Tug 1205 is suitable for use as a mooring boat and for pilotage duties. When used to handle ship's mooring lines overhead protection rails can be fitted, along with bulwarks of a suitable height and any other necessary fittings. For transporting pilots additional handrails, steps, and other essential equipment are easily installed.

The propulsion system based on experience with the larger Stan Tug 1606. Two heavy duty, manganese bronze, Kaplan style fixed pitch propellers of 1,050 mm in diameter, rotate within high performance Van der Giessen Optima nozzles lined with stainless steel. The stainless steel propeller shafts are water lubricated at the outboard end and the inboard bearings with grease. Two streamlined double plate rudders, one aft of each nozzle, are operated by a powered hydraulic steering gear giving 2 x 55 degrees of movement.

Two Volvo D9 MH, diesel main engines generate a total of 644 bhp (442 bkW) at 1,800 rev/min to drive the propellers via Twin Disc MG 5091, reverse reduction, gearboxes with a ratio of 3.82:1. The diesels complying with the requirements of IMO and US EPA Tier 2. They are equipped with electronic fuel injection systems and twin turbo chargers, giving them outstanding acceleration and economy. Flexible mountings and couplings are used to reduce vibration and noise transmission throughout the vessel.

A well-proven closed circuit keel cooling system enables the vessel to operate in extremely shallow water without fear of contamination. Exhaust gases are discharged through the transom, via 40 dBA silencers, well lagged and mounted in the engineroom. An engineroom ventilation system provides 7,000 cu/m of air per hour. An engineroom alarm is installed and activated by engine and gearbox fault conditions and bilge water sensors.

Electrical power is supplied by a single Onan MDKBP-eQD auxiliary generator rated at 17.5kvA at 230 volts, 50 Hz. Two 24volt 200Ah battery packs, with a changeover facility are used for engine starting and domestic use.

An electrically driven Sterling SIHI VWSI5013 bilge and general service pump is rated at 15 cu/m of water per hour and has hydrant connections in the engineroom. An emergency, hand operated bilge pump is located on deck.

The wheelhouse design for the new Stan Tug 1205 closely follows the standards developed for the larger vessels in the series, with the controls and instrument panels positioned using ergonomic principles. Excellent all round visibility is made possible by large, deep, windows and few blind spots.

A centrally located helmsman's position, and chair, is placed close to the forward windows, with all of the essential controls and instruments within easy reach. Standard instrumentation includes a Fluxgate compass, a Furuno GP-32 GPS, a Furuno LS 6100 echosounder and Sailor RT2048, 25W VHF radio. Mandatory modern LED navigation lights, towing and pilot lights, and a searchlight are also standard. Additional equipment such as a Furuno FR 1832 radar are optional extras.

Comfortable seating for two persons and a table are part of the standard wheelhouse layout. An important feature of the wheelhouse design is the flexible mounting of the entire structure. Modern durable linings and insulating materials are used throughout and a Dampa acoustic ceiling is fitted. The result is a reduction in sound levels in the wheelhouse to just 55dBA when the vessel is underway.

The wheelhouse and additional living facilities below decks are air conditioned and heated. The standard basic workboat is fitted out as a day boat with cooking facilities, a refrigerator, pantry, shelving and a toilet with hot and cold water. As an option, the same area below deck can be fitted out to include sleeping accommodations for two persons.

On trials, the first Stan Tug 1205 handled extremely well, and was vibration free and extremely quiet. A bollard pull of 9.0 tonnes was achieved and a free running speed of 9.8 knots.

This first vessel is one of a batch of six, all of which will be fully fitted out ready for delivery. Most additional items can be supplied from stock, including a deck crane and additional fire fighting equipment. Even with a degree of customization to suit a client's particular needs delivery can normally be made within 8 weeks of placing an order.

Two other vessels currently under development for the smaller end of the Stan Tug range are the Stan Launch 804 and the Stan Tug 1004. These new vessels, which will be available shortly, will be offered as replacements for the Mini Cat 803 and where suitable the Pushy Cat 1204. Both vessels are recognizable as part of the new Stan Tug tfamily and have many design features in common with their larger relations.

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