A Turkish shipyard adapted a harbour tug design for shallower draughts and installed split-drum winches on both fore and aft decks
When Turkish marine services provider Tüpraş’ subsidiary Ditaş needed tugboats to operate in harbours with shallow water, a local shipbuilder modified an existing design to meet these requirements.
RMK Marine Shipyard completed the two tugboats T.Damla-8 and T.Damla-9 for Ditaş in Turkey in January and March 2020. To achieve this, the Istanbul-headquartered shipbuilder adapted a Robert Allan RAmparts 2500-W harbour tug design for shallow draught (SD) of only 5 m.
The tugs were built with an overall length of 25.4 m, moulded beam of 11.8 m and a hull depth at its least moulded of 4.6 m. They were constructed to ABS class with notations for towing vessels, FiFi1, bollard pull of more than 70 tonnes, unrestricted service and with notations ✠A1, ✠AMS and QR.
Robert Allan said it designed the tugs’ wheelhouses with a single split control station “with excellent visibility over both the fore and aft working decks”.
RMK Marine outfitted the accommodation for a crew of six in compliance with Maritime Labour Convention requirements.
Main propulsion for T.Damla-8 and T.Damla-9 comes from a pair of Rolls Royce Power Systems-supplied MTU 16-cylinder engines. The 4000M63L diesel engines are each rated at 2,240 kW at 1,800 rpm and drive two Kongsberg-supplied US 255S controllable pitch azimuthing drives through straight line carbon fibre shafts.
Electrical plant consists of two Margen-packaged diesel generator sets, each with an electrical power output of 140 kW at 50 Hz and 400 V. These tugs also have a separate switchboard room.
RMK Marine included tank capacities of 72.9 m³ for fuel oil, 9.8 m³ for potable water and 7.7 m³ for foam. This foam is used for fire-fighting through FiFi1 systems supplied by Marsis. These packages each feature two pump sets driven by one of the main engines and two remotely operated monitors. The MF20-EF monitors deliver up to 1,200 m3/hr of seawater and 300 m3/hr of foam.
T.Damla-8 and T.Damla-9 have considerable deck machinery supplied by Data Hidrolik including a DFW 45x180HZ split-drum, hydraulic towing winch on the foredeck. This winch’s first layer has 180 tonnes of brake holding load and pulls 45 tonnes at 8 m/min for low speed and 10.5 tonnes at 32 m/min for high speed towage.
There are also DTH 70-130 towing hooks on the fore and aft decks. Data Hidrolik also supplied DTP 12SH flush deck towing pins and a DTW 45x180H split-drum hydraulic towing winch with spooling gear on the aft deck. This has a brake holding load of 180 tonnes and similar performance to the foredeck winch.
Toimil Garcia supplied cranes of 28 tonnes lifting capability for the aft decks on both tugs.
T.Damla-8 and T.Damla-9 have extensive fendering for ship handling. Robert Allan said it engineered bow fendering for Ditaş’ requirements of less than 20 tonnes/m2 maximum fender pressure.
Fendering on the bow consists of an upper row of 100-cm diameter cylindrical fender tapering to 80 cm diameter at the sides and a lower course of W-fender. In addition, there are 300 mm D-rubbers at the sheer strake around the tugs and 300-mm thick W-fenders fitted at the stern of each tug.
T.Damla-8 and T.Damla-9 particulars
Builder: RMK Marine
Country of operations: Turkey
Designer: Robert Allan
Design: RAmparts 2500-W SD
Length, oa: 25.4 m
Beam, moulded: 11.8 m
Depth, least moulded: 4.6 m
Harbour draught: 5 m
Engines: 2 x MTU 16V 4000M63L
Rated: 2,240 kW at 1,800 rpm
Propulsors: 2 x US 255S CP drives
Fuel oil: 72.9 m³
Potable water: 9.8 m³
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