Second SIGMA Class Frigate delivered to Marocco

By Keith Henderson at March 20, 2012 07:59
Filed Under: Company News, Navy News

Earlier this month the second of three Sigma Class frigates, the Sultan Moulay Ismail (#614), was handed over to the Royal Moroccan Navy by the builders, Damen Schelde Naval Shipbuilding (DSNS), Netherlands. The first frigate, the Tarik Ben Ziyad (#613) was commissioned in September 2011 and is slightly longer with LOA 105 m, the beam remains the same at 13 m but the weight is heavier displacing 2,335 t. The third ship (#615) is due for delivery later this year.

Caption: Royal Marocco Navy Sultan Moulay Ismail (#614) undergoing North Sea trials prior to delivery by builders DSNS
image credit: Damen Schelde Naval Shipbuilding

The second and third ships have an LOA of 98 m, beam of 13 m and displacement of 2,075 t. All three ship use the same propulsion system of twin Pielstick 20PA6B STC diesel engines each rated at 8,910 kW at 1,094 rpm. On each shaft there is a Renk ASL94 transmission with a reduction ratio of 4.33:1 driving Rolls-Royce Kamewa 5 CP propellers. Auxiliary electrical power is provided by four Caterpillar 3406C TA gensets each with 350 kW output. There is a single Caterpillar 3304B emergency genset rated at 105 kW.

Maximum speed is 28 kn, cruising speed is 18 kn giving a range of 3,600 nm and economy speed is 14 kn giving a range of 4,800 nm.

Sigma stands for Ship Integrated Geometrical Modularity Approach and offers a flexible series of variants described as corvettes or frigates. The program has attracted several export orders: Indonesia four 91 m vessels plus a plan to build one 105 m in Indonesia, Morocco one 105 m and two 98 m vessels. Vietnam is negotiating four vessels with two to be built in Vietnam with DSNS supervision. Oman is understood to be interested to order four vessels.

Caption: A Pielstick 20PA6B STC diesel engine about to leave the factory.
This 20 cylinder diesel engine is rated at 8,910 kW at 1,094 rpm.
image credit: SEMT Pielstick

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