Little Sister Developed to Meet Market Demand

A Sanmar delivery crew is currently making the trip from Turkey to Dubai with the first of a brand new design of ASD tug jointly developed by Sanmar AS and Robert Allan Limited (RAL) to meet the market’s demand for more compact tugs with bollard pulls ranging between 45 and 60 tons. The lead tug of the resultant new series has been purchased by Drydocks World - Dubai and the keels have been laid for two more of the same.

Commented Ali Gurun of Sanmar: “The industry is under the challenge of ever tighter cost control and the only way to achieve this is to have more bollard pull in more compact hulls with and low operational and maintenance costs. This new design, which is exclusive to us, combines all these attributes”.

In mid-2015, Sanmar contracted with the naval architects RAL to design a “little sister” to its highly successful Bogacay series tugs. The result is a compact yet powerful 22m design designated by Robert Allan Ltd. as the RAmparts 2200 class and by Sanmar as their Sirapinar series. The first of these tugs, Sirapinar, completed sea trials only 16 months after the signing of the design contract and the vessel is on its delivery voyage.

The new series builds on the success of the RAmparts 2400-SX Bogacay series, of which over 30 have been constructed, with bollard pulls ranging from 60 to 75 tons. The hull of the new 22m tugs is similar to the larger model and can run astern at high speeds, whilst maintaining good control and directional stability in all directions.

Sirapinar measures 22.40m overall with a beam of 10.85m and maximum draft of 4.67m and has been built to RINA class requirements. It is powered by two Caterpillar 3512C main engines each developing 1380kW at 1,600 rev/min. These turn Schottel model SRP 1012 fixed pitch azimuthing Rudderpropellers with 2,100mm diameter propellers. Auxiliary power is supplied by two Caterpillar 86ekW C4.4 diesel generator sets. The port main engine powers a single FFS pump which feeds a single monitor with an output of 1200 m³/hr.

On trials, the vessel met or exceeded all performance expectations, with bollard pulls of 46.9 tons ahead and 44.8 tons astern. The free –running speed ahead was measured at 12.2 knots. The series can, however, be fitted with more powerful propulsion options to give up to 60 tons BP.

Although the accommodation layout can be adjusted to match almost any reasonable requirement, the first vessel off the line has been outfitted to a high MLC compliant standard for a crew of six. The wheelhouse is designed with a single split control station which provides maximum all round visibility and exceptional visibility.

On the fore deck is a DMT electric double-drum hawser winch with a brake-holding load of 150 tons. Rope capacity on each drum is 210m of 40mm diameter synthetic rope. Aft is a Data Hidrolik tow hook with pneumatic auto-release and there is an electric capstan on the aft tow post with SWL of 5 tons.

Even at this early stage it seems certain that the RAmparts 2200-SX Sirapinar series is destined to follow in the wake of its bigger sister and become another highly desirable and popular tug from this unrivalled design and build team.