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 tonnes. 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 tonnes ahead and 44.8 tonnes 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 tonnes BP.