Offshore Ship Designer (OSD) has unveiled its new series of tractor tugs to be used for a wide range of functions including escort operations, harbour towage, ship handling, offshore mooring and berthing.

The 33m-long tug has a beam measuring 13.5m and is designed to be easily customised to a range of sizes.

It can accommodate from eight to 12 persons with the provision of individual sanitation facilities.

With a high forecastle deck, the tug’s hull is fitted with side wings to make the tug more water resistant, augment its stability and improve its capability to control excessive motions at sea while making it suitable for towing and salvage operations.

The wheelhouse is designed to allow optimum visibility of the work deck during escort operations and low-visibility conditions over the bow during transit modes.

The aft-deck is incorporated with a broad tow-staple to control excessive tilting of the tug caused by tension on the wire while it is spacious enough to accommodate the towing winch.

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The aft bulwark structure is fitted with an integrated tow-pin arrangement. A knuckle-boom crane is outfitted with outreach over the aft-deck area.

"The configuration of the propulsion drive can be suited to client needs which vary from diesel-electric, hybrid with or without batteries."

The tugs can be propelled by either Voith Sneider cycloidal propellers (the Cyclotrac 3270 model) or azimuthing thrusters (the Azitrac 3270 design).

Additionally, the configuration of the propulsion drive can be suited to client needs which vary from diesel-electric, hybrid with or without batteries. Depending on engine and propulsion configuration, a bollard pull of 90t can be achieved.

The OSD built tugs are aligned to the guidelines stated by the Maritime Labour Convention (MLC) and can be delivered with a FiFi1 class notation.

In April 2014, OSD’s UK division developed new designs for 1,350dwt IMT972 offshore wind farm service operation vessels (SOVs).

Image: A graphical representation of OSD’s new tractor tugs. Photo: courtesy of Offshore Ship Designers.