Fregate has hybrid propulsion and solar panels to reduce its gaseous emissions in the ports of Cayenne and Kourou, in French Guiana
Dutch Dredging and Iskes Towage & Salvage jointly invested in an innovative multipurpose tug, one of the first to operate with hybrid propulsion and solar panels in South America. Fregate was unveiled and added to the fleet in September with the latest engineroom systems and deck equipment.
Fregate will work alongside 2017-delivered Papillon in the ports of Cayenne and Kourou in French Guiana. Both are operated by De Boer Remorquage SARL, a joint venture between Dutch Dredging and Iskes Towage, who signed a 12-year contract in 2016 to provide marine services to the Grand Port Maritime de Guyane.
Both vessels assist shipping in Cayenne and Kourou and provide standby and fire-fighting support in emergencies. Fregate has additional dredging equipment for maintaining port approaches and motors that enable it to transit using just electric power.
Fregate was built by Safe Engineering Services in Gdansk, Poland, to a Damen WID Tug 2915 design and to Bureau Veritas class for unrestricted navigation. It also holds a green passport. It has an overall length of 29.2 m, overall beam of 15 m, draught of 4.6 m and a bollard pull ahead of 42.5 m with a full speed of 12.5 knots.
Dutch Dredging co-director Hugo van de Graaf said these vessels were designed and built for specific client requirements “such as the combination of very limited draught and length with adequate bollard pull.”
Fregate’s main propulsion comes from two Caterpillar type 3512C engines with a combined power of 2,850 kW at speeds of 1,600 rpm. These drive a pair of Veth azimuth thrusters of type VZ 1250 VHD and a diameter of 210 cm.
In addition, Fregate also has a Veth VT240 tunnel thruster at the bow that generates 200 kW at 1,500 rpm with a propeller diameter of 98 cm. Its hybrid drive comes from two electric motors that each generate 400 kW or power at 690 V of alternating current at 60 Hz. It also has a set of solar panels that load batteries, which complement power from the generators, motors and engines.
Its hybrid drive set enables De Boer Remorquage to minimise emissions in French Guiana ports and lower fuel costs. However, there is still a full set of generator sets in the engineroom. These include one Caterpillar C7.1 genset that generates 150 kW of electrical power and a C4.4 genset that produces 86 kW of electrical power.
A key part of Fregate’s deck machinery is the water injection dredging unit that can pump 10,400 m3/hr of water. This capacity comes from two BP 6055LD pumps, each working at 5,200 m3/hr at pressures up to 2 bar. These also drive two electric motors that each generate 340 kW of electric power.
This tug has an AK30 HE2 deck crane supplied by HS Marine with capacity of 2 tonnes at 9.2 m. Also on deck is a TWE-350KN electric-driven forward winch supplied by DMT. This has a double drum with one of these pulling 42-44 tonnes at a speed of 8 m/min or 14 tonnes at 24 m/min.
Fregate also has an aft winch with a single split drum and with Dyneema rope for lowering the dredging arm. Its fire-fighting system was supplied by FFS with capacity to pump 2,850 m3/hr of water through two remotely-operated monitors. This tug has accommodation for seven people.
Owner: De Boer Remorquage
Builder: Safe, Poland
Type: multipurpose/dredging tug
Design: WID 2915 Hybrid
Class: Bureau Veritas
Length, oa: 29.02 m
Beam, oa: 15 m
Draught: 4.60 m
Bollard pull: 42.5 tonnes
Ahead speed: 12.5 knots
Main engines: 2 x CAT 3516C
Thrusters: 2 x Veth VZ 1250 VHD
Gensets: Caterpillar C7.1, C4.4
Accommodation: 7 crew
Deck: WID, 10,400 m3/hr capacity