Uzmar-built tug returns from successful sea trials

APRIL 13, 2014 — Turkish shipbuilder Uzmar reports that the 20.4 m line multipurpose Robert Allan designed line-handling tug Koc Musaned 2 returned to its Izmit shipyard April 5 after the first stage of sea trials.

Designed for a wide range of mooring operations and oil spill response,the tug is powered by twin Cat C32 marine engines, each producing1,200 bhp at 2,000 rpmcoupled, through a ZF reversing gear box to Teignbridge propellers in nozzles and with a triple high efficiency rudder system to ensure superior maneuverrability. This arrangement gives the tug a maximum bollard power of 19 tons ahead and speed of 10.5 knots.

A Caterpillar 4.4 auxiliary generator, rated 86 ekW-­‐50hz at 1,500rpm, is installed to meet domestic shipboard loads and to power the electrically driven deck machinery.

The trials speed was determined by averaging all of the measured speeds during four runs. The fully ballasted vessel achieved a speed of 11.5 knots against the required speed of 10.5 knots at 90%MCR.

In the crash stop test, at the contracted maximum service setting, on the order to "execute crash stop," the propulsion machinery was set to full-­astern and the helm put hard-over to port and then the starboard. The vessel reached 0 knots from maximum power at three vessel lengths, 61.2 m.

For the endurance test, the propulsion machinery was set to the contracted maximum service setting and the fuel flow, exhaust and cooling water temperatures and ship's speed were all recorded and all were excellent.

Maneuvering trials were successfully completed on direct and reverse spiral maneuvers, zigzag, and lateral thrusters use. A "Z"manoeuvring test (35'/30', 30'/35') was performed in 11 seconds.

The seakeeping measurements of ship motions in various sea states followed by a series of analyses to determine comfort levels proved the high quality of UZMAR's manufacturing qualities.

The bollard pull test saw 21.5 tonnes exerted at 90% MCR, on a shore-mounted bollard through a tow-­‐line, compared to a required19 tonnes at 100%MCR.

Acoustic and vibration measurements were well under the maximum levels of IMO and Lloyd's Register. The wheelhouse acoustic and vibration measurement was 59.3dB at 90% MCR.

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