-   Die Kotug-SD

Kotug BV commissioned their first ASD (Azimuth Stern Drive)-tug, the second hand SD JACOBA in January 1999. She was a Robert Allen Ltd (RAL) ASD 30/60 design. Three more ASD’s, SD GIRONDE and sisters, followed in 2006. They were designed by Kenton Marine who designed the Rotor-Tugs RT ANTONIE and sisters too. The latter tugs were built for Kotug by MedMarine in Turkey. With a number of tugs engaged in Le Havre Kotug often had to charter tugs for their operations in Rotterdam. When a permanent need for more tugs arose Kotug addressed MedMarine again to build four tugs for them:


-   Construction phase

The new tugs were to the RAL RAmparts 3200 design. RAL prepared this design for smaller shipyards without own design offices, to give them a chance to offer tugs, too. It is a kind of “standard design“ which gets adjusted to the buyer’s requirements by RAL. Tugs are being built to this design mainly on shipyards in Turkey and China. The first RAmparts 3200 design was delivered by Sanmar , Turkey, as type Escort in 2003. In the meantime the design has developed into a success story. 60 tugs of this design were operating, being built or in the design stage at the end of 2007. The Eregli Shipyard in Turkey, part of the MedMarine Group, started building six tugs to the RAmparts 3200 design on their own account in mid of 2006. Four of these tugs were sold to Kotug BV. They were launched between mid of January and end of May 2008. SD SHARK was the first to arrive in Rotterdam on 8.04.2008, SD SEAHORSE the last one on 7.08.2008.

-   Description

General: The four tugs are typical ASD-tugs with the rudder propellers beneath the stern. The propulsion units are mounted approx. 5 m from the stern and are tilted backwards approx. 6° to get a smaller angle for the universal joints and a better performance. The propulsion units are two Schottel rudder propellers type SRP 1515 CP with 2.60m diameter controllable pitch propellers in nozzles. The units jut out approx. 1.30m beneath the hull’s bottom. A deep skeg begins at the bow and ends approx. 12m from the stern. It gives a kind of protection against groundings and adds to the directional stability. Two Caterpillar diesel engines type 3516 C with 1,920kW (2,609bhp) each at 1,600rpm power the propulsion units via cardan shafts. The tugs have a bollard pull of 65t forward, 60t astern and reach a maximum speed of 14.8kts. The bunker capacities are 132m3 MDO (marine diesel oil), 40m3 freshwater, 17.5m3 foam, and 36m3 ballast water. The tugs are equipped according to FiFi1 standard. Kumera step-up gears are attached to the front end of the main engines and drive Scanpump AB fire pumps providing 2x 1,350m3/h water for the two Fire Fighting Systems (FFS) monitors (2x 1,200m3/h) and the self-protection drenching system (300m3/h). The tugs are licensed for unrestricted service.

Tank top deck:

From bow to stern the following compartments are located: forepeak, diesel and freshwater tanks, engine room, compartment with a reel for a spare towing wire and tanks at both sides, and aft peak. The engine room houses additionally to the main engines and fire fighting pumps two generator sets Scania DI 1262 M providing 175kW each. They are placed in row in the ship’s center line. A harbor set Sisu 420 DSR MG provides 60kW and is placed at port.

Mezzanine deck:

The deck is located above the diesel and freshwater tanks at approx. half height of the engine room. It begins approx. 3.50m from the bow and is near 9m long. It is located completely beneath the raised forecastle. It houses two twin-berth crew cabins, separate sanitary spaces, provision store, and a smoking room. At the aft end the engine control room is located, overlooking the low-lying engine room.

Main deck:

Afterdeck: The aft towing winch is mounted between the funnels. The single drum winch is a hydraulically operated type DTW 45x180 H provided by DATA Hidrolik Makina Sanayi A.S, a Turkish company. The drum has pulling powers of 45t at 5m/min and 11t at 20m/min. The brake power is 180t. The winch has one warping head. The drum carries 600m steel wire of 51mm diameter, a synthetic fiber stretcher, and a steel wire pennant. A large towing fairlead is erected directly behind the winch. A DATA Hidrolik towing hook with a SWL of 70t is attached to the starbord post of the towing fairlead. Differing from the Ramparts 3200 “standard design” the Kotug tugs have no open stern and miss a stern roller. Instead they have a closed bulwark and as extra two load rails. A short distance from the stern bulwark an additional fairlead is welded to the deck.
Forecastle: Four steps lead up to the raised forecastle at about half of the tug’s length. A hydraulic anchor, towing, and escort winch is mounted in front of the superstructure. It was provided by DATA Hidrolik too and is of the type DEW 35.65x180 HZ. The winch has one towing drum, two chain lifters, and two warping heads. The drum carries 180m Ultraline, a synthetic fiber, of 76mm diameter. The pulling powers are 35t at 6m/min and 6t at 30m/min, the brake power is 180t. In escort operations the winch holds a pay-out load of 50t. A large towing fairlead is installed in front of the winch. The two anchor chains are 24mm diameter, grade U2 and are attached to two HHP-anchors of at least 450kg weight.
Superstructure: Two single-berth cabins with en-suite sanitary spaces for captain and chief are located at starbord. At port are the mess and galley. The two funnels are attached to the back of the superstructure. Located behind the funnels are two ventilation shafts. Steel pipes are welded to the outer edges of the ventilation shafts to protect the superstructure against braking and snapping towing wires. The superstructure is fully air-conditioned.

Bridge deck:

Two FFS monitors are mounted at the front of the deck. The wheelhouse occupies two thirds of the deck and is set against the deck’s trailing edge. On each side of the wheelhouse a Viking 12-person inflatable life raft is mounted in a rack at the railing. A hydraulic knuckle boom crane is fitted to the top of the port ventilation shaft. The type 060-PO-YM2 crane was delivered by Özdörtler Hidrolik Makina Sanayi ve Ticaret Limited, a Turkish company. It has a SWL of 750kg at the maximum reach of 7.30m or 2t at 3.00m reach. A rigid life boat is placed above the starboard ventilation shaft. Company Ernst Hatecke provided the boat, a type RB400, with 15hp outboard engine. The wheelhouse is raised approx. 1.2m above the bridge deck. The resulting void is used for batteries and air-conditioning equipment. The wheelhouse floor is lowered a few steps at the aft end to provide a better view of the afterdeck. It is used as landing of the stairs to the main deck. Most of the communications equipment is placed there. Two main control consoles are arranged at both sides of the ship’s center line. They carry the controls for among others the propulsion units, the winches, the fire fighting system, and the navigation lights. The seat between the consoles is guided by rails. The navigation equipment contains magnet compass, gyro compass, auto pilot, two radar systems, GPS, AIS, and echo sounder. The communications equipment is to GMDSS Area 3 standard and consists of among others VHF, Navtex, Epirb, SART, and Inmarsat C.


It carries the mast, the magnet compass, two search lights and antennas. The mast carries the two radars, the navigation lights and again antennas.

-   Operations

The four tugs are stationed in Rotterdam’s Europoort and are used mainly for ship assistance.

-   Particulars

Length overall: 32,00m
Length between perpendiculars: 30,00m
Beam overall: 12,00m
Beam moulded: 11,60m
Depth moulded: 05,36m
Draft of hull: 04,19m (summer load)
Draft to bottom of drives: 05,54m (summer load)
Air draft: 20,00m
Volumes: 483 gt,145 nt
Main engines: 2x Caterpillar 3516C diesel engines
Output: 2x 1,920kW /2,609bhp (total 3,840kW/5,218 bhp) at 1,600rpm
Speed: 14,8kts
Bollard pull forward/ astern: 65t/ 60t

MedMarine/ Eregli shipyard
DATA Hidrolik
Özdörtler Hidrolik

For photos in higher resolution please click the thumbnails!
- -
SD Shark SD Seal
SD Shark SD Seal
SD Stingray SD Shark
SD Stingray SD Shark & SD Stingray
SD Shark SD Stingray
SD Shark SD Stingray – bow view of superstructure
SD Stingray André B
SD Stingray – Bow fendering SD Stingray – starbord view of superstructure
SD Stingray André B
SD Stingray – stern view SD Stingray – port view of superstructure
SD Shark SD Seal
SD Shark – bow view of wheelhouse SD Seal – starboard view of wheelhouse
SD Shark SD Shark
SD Shark – stern view of wheelhouse SD Shark – port view of wheelhouse
SD Shark SD Shark
SD Shark – bow view of forecastle SD Shark – forecastle viewed from wheelhouse
SD Shark SD Shark
SD Shark – Data Hidrolik winch on forecastle SD Shark – afterdeck viewed from wheelhouse
SD Shark SD Shark
SD Shark - Data Hidrolik aft towing winch SD Shark – towing fairlead with Data Hidrolik towing hook
SD Stingray SD Shark
SD Stingray – Hatecke RB400 rigid life boat SD Stingray - Özdörtler Hidrolik knuckle boom crane
SD Stingray SD Stingray
SD Stingray – fire fighting monitors on brige deck SD Stingray – FFS monitor
SD Stingray SD Shark
SD Stingray - mast SD Shark – landing in wheelhose with communication equipment
SD Shark SD Shark
SD Shark – main control consoles in wheelhouse SD Shark – port control console
SD Shark SD Shark
SD Shark – main switch board SD Shark – engine control console overlooking engine room
SD Shark SD Shark
SD Shark- starbord engine Caterpillar 3516 C SD Shark – engine room, view forward
SD Shark SD Shark
SD Shark – Scania generator Set SD Shark - starbord engine
SD Shark SD Shark
SD Shark – port engine SD Shark – Kumera gears and Scanpump fire fighting pump
SD Shark SD Shark
SD Shark – harbor generator set SD Shark – universial joint
- -