BNR 175 - Isa

Shipyard Kooiman Hoebee in Dordrecht, a unit of the Kooiman Marine Group, delivered a twin screw tugboat for the first time to the Dutch towing company Sleepboot Isa Vof. The tugboat bears the name Isa and is a multi-purpose tugboat designed for towing and pushing activities, supply and port activities, and is based on the design of the sister tugboat Meander. completed earlier. The Isa, however, is equipped with larger propellers and a different propulsion system.

The Isa was designed in accordance with the owner’s specifications by Kooiman Engineering, in close consultation with the technical agency Technisch Bureau Gommers. The engineering, construction of the steel and aluminium hull, fitting out, cables and pipes and entire interior carpentry work for the accommodation and wheel house, including furniture, was carried out at Shipyard Kooiman Hoebee with the company’s own facilities. The most striking features of the design are the extremely shallow draught of only 2.50 metres, the powerful bollard pull of more than 30 tonnes and the large fuel and water storage capacity for supply tasks.

The design and construction of the tugboat fully satisfy the rules and regulations of Lloyd’s Register of Shipping, which rated it as M 100 A1 TUG LMC UMS. The design also fulfils the requirements of the Netherlands Shipping Inspectorate (NSI) for the sea area A3 (worldwide navigation area).

The hull has a steel fender right round the vessel. The bow has a rubber covering which has been specially reinforced for pushing. The tug’s stability is improved by a skeg between the two propellers. The tugboat has a fully welded steel construction and is equipped with a double reinforced hull. The Isa has two Van Voorden fixed propellers and directional control through a double twin rudder system.

Machines mounted on the deck include a horizontal Menarom electric winch equipped with two cable lifters of 20.5 metres U2 anchor chain cable, a drum for 20 mm nylon rope with an operating speed of 11 metres/minute. The winch has a maximum pulling power of 4.4 tonnes at a speed of 9.20 metres/minute and is equipped with two heads for handling mooring and unmooring cables.

SHIP TYPE:

Twin screw chine strake hull tugboat with stern roll and push bow, 100 A1, Tug, LMC, UMS

MAIN DIMENSIONS:

• Length o.a. 29.80 m
• Beam (mld) 9.50 m
• Depth 3.10 m
• Low draught 2.50 m

PROPULSION SYSTEM:

• Main engines: 2x Mitsubishi S16R MPTA
• 3 x Reintjes reverse gear WAF 763 reduction 5,750 : 1
• Total output: 1179 kW at 1600 r.p.m.
• Bow thruster: Veth VT-150 elektrical bow thruster 160 kW

AUXILIARY SYSTEMS:

• 1x Mitsubishi S6B3-MPTA 335 kW at 1500 r.p.m. (with 392 kVAStamfordgenerator)
• 2x John Deere 65 kVA 

AUXILIARY DEVICES:

• Winch: Maaskant M2-H2-220kN, two drums
• 2×22 tonne pull, 2×51 tonne holding force
• Deck crane: Double D marine equipment B.V.
• Heila, hydraulic knuckle boom marine crane  HLRM 200-4SL (200tm)