Designed between the yard and Macduff Ship Design, during the early design phase of the lead vessel the Wolfson Unit in Southampton were commissioned to run a case study of two hull forms utilising CFD technology. The first hull form was in fact the previous FOREVER FAITHFUL, the second was the new concept model featuring increased length, a gradual bustle forward of the propeller and a unique stem where the bulbous bow was not fully submerged but rather tapered gradually into the bow’s upper region. Results from the study indicated a significant reduction in hull resistance at the two test speeds of 8 and 10 knots which has now been verified, with the new vessel steaming around 1 knot faster at full engine power than the previous vessel, with both vessels sharing the same engine and available power. This increase in hull efficiency enables the owner to run the engine at a lower loading to save fuel, and in turn, reduce the emissions and environmental impact of the vessel.

To further reduce the environmental impact of the vessel, the propulsion package was very carefully considered. The vessel features a Masson Marine W6000 gearbox with a large 10:1 reduction, the largest reduction ratio the yard has fitted to date with a fixed pitch propeller. This gearbox allowed the yard to fit a 2.5 m diameter propeller, fitted within a modern profile of nozzle duct, providing high thrust at low speeds but also a slight increase of thrust at steaming speeds too compared to the previous vessel. The propulsion power is provided by a Caterpillar C18 main engine with a power output of 600 hp.

The C18 main engine on FOREVER FAITHFUL is a Tier III certified engine and as typical features a catalytic convertor and a urea/AdBlue system which enables the engine to meet the new, more stringent emission standards set by the IMO. Certification of the engine and SCR system was arranged by Finning CAT with certification provided by DNV/GL. The system was proven to work well during sea trials where the 35 dB reduction SCR silencer helped the reduce noise levels throughout the vessel. It is the third system of this design fitted by the yard to date, and the sixth vessel the yard has delivered with Tier III certified engines.

The hull of FOREVER FAITHFUL is built entirely from steel, apart from the wheelhouse and mast which are aluminium, and features a double chine hull form, transom stern and modern bow designed to cut cleanly through the sea with less energy leading to a reduction in fuel consumption and emissions along with increased crew comfort.

Although a sister ship to two other vessels, the layout of the FORVER FAITHFUL varies significantly, both inside and out. In a first for the yard, the accommodation above the deck is fitted solely to the port side, with two washrooms and the cabin access fitted aft and a generously sized galley mess amidships running forward. The starboard side features a dry locker aft centre, with the fish hopper outboard of this, immediately forward of the aft shelter where the two net drums are situated. Once the catch has been lifted onboard, it is taken forward by a hydraulic conveyor onto the working deck, where the catch is selected and washed.

The FOREVER FAITHFUL is arranged for freezing the catch at sea. Once the catch is sorted and washed, it is then packed at the forward end of the working deck, before being taken into a blast room on the forward port side, immediately forward of the galley when the prawns are frozen at -35 to -40 degrees centigrade for a period of around four hours to six hours. The blast room can hold around 1000 kg of packed product on the stainless-steel racking arranged inside.

Once the product is frozen, it is then lowered directly into the cold store below, situated in the aft part of the hold until it is landed at the end of the trip. A bulkhead with large cold store door divides the fish hold into two, and the forward part of the hold is arranged as a traditional wet fish hold with its own chilling system, and capable of holding around 250 boxes of chilled fish.

A bespoke hydraulic deck machinery package was fabricated by the yard including of a triple barrel winch featuring a Hagglunds compact CA210 motor, two split net drums complete with two Hagglunds compact CA70 motors per drum. Thistle Marine of Peterhead supplied both the MFB8 landing crane and MBK7 power block crane, both of which featuring a slew ring base. A small hoisting winch is fitted to help the move the catch in the hold when landing.

Primary hydraulic power is provided by a dedicated auxiliary engine, a Doosan/Hyundai 4AD086 with 199 kW engine power available. This engine also certified to IMO Tier III standards and features a SCR unit and urea pumping system. The auxiliary engine drives two hydraulic pumps for primary power, but the vessel also features a 45 kW electric motor hydraulic motor pump which acts as a net retrieve and can be ran in the harbour powered by either generator set.

Cooling systems for all engines and hydraulics onboard are served by box coolers supplied by Blokland Non-Ferro.

Electrical power onboard is provided by two Mitsubishi generator sets supplied by Macduff Diesels Limited, each with a rating of 98 kWe and of sufficient size to run the vessels power independently providing complete redundancy.

The electrical systems onboard were designed and fitted by R.D. Downie who also fabricated the vessels switchboard and control panels for all the pumps and motor starters.  In addition to this R.D. Downie also provided the fire, bilge and gas alarm systems onboard along with the navigation light panel and assisted with the installation of the navigation equipment.

The fish processing deck features a catch handling system built by the yard and Northeast Fabricators, along with the sorting tables and racking for freezing the product.

The fish hold freezing/refrigeration systems along with ice machine were all supplied and fitted by Premier Refrigeration. The vessel features four separates set of plant, and utilises blower type units instead of traditional refrigeration pipes.

The vessel was fully painted by the yard with International products applied to a comprehensive marine spec. Davidsons Marine & Industrial Painters applied the external coatings to the vessel.

The high specification navigation package was supplied and fitted onboard by Woodsons of Aberdeen, please contact Steven Wood for full details.

A trawl monitoring system is fitted, supplied by Marport UK.

Construction drawings and stability information supplied by Macduff Ship Design

Caterpillar C18 main engine supplied by Finning Power Systems, UK

Nozzle supplied by Kort Propulsion, UK

Propeller and Gearbox supplied by Masson Marine, France

Auxilliary engine supplied by Watermota, UK

Generator sets supplied by Macduff Diesels Ltd, UK

Box cooling systems for each engine and the hydraulic circuit supplied by Blokland Non Ferro, Netherlands

Pumps supplied by Azcue Pumps SA, Spain

Deck machinery equipment supplied by the yard

Deck cranes supplied by Thistle Marine, UK

Fire doors supplied by B-15 Marine Ltd, UK

Weathertight doors supplied by Winel, Netherlands

Rudder system supplied by the yard

Steering gear supplied by Scan Steering APS, Denmark

Wheelhouse windows and portlights supplied by HK Van Wingerden & An BV, Netherlands

Fish handling system supplied by the North East Fabricators, UK

Refrigeration system and ice machine supplied by Premier Refrigeration, UK

Paint system by International, UK

Wheelhouse chairs supplied by Norsap, UK

Oil fuel filter/separator and main engine oil fine filter supplied by CC Jensen, UK

Pressure washers supplied by Grampian Power Clean, UK

Anchors and chain supplied by Fendercare Marine, UK

Switchboard and electrical system supplied and installed by R D Downie Limited, UK

Designed by the yard with close assistance from Macduff Ship Design.  During the early design phase the Wolfson Unit in Southampton were contracted to complete a case study of three different hull forms. The first hull form was the hull form of the previous vessel which was tested in order to establish a benchmark for hull resistance. The second and third hull forms featured the same main body, but with different variations of the bulbous bow to help identify the best shape to reduce overall resistance. The results from the study indicated a reduction in hull resistance at the two test speeds of 8 and 10 knots for both variants, but with one showing a slight improvement over the other due to the bulbous bow wave interaction with the hull. Given the increased hull size and displacement for the new vessel, this was deemed to be a success. By carrying out CFD analysis for vessel hull forms at the early design stage, it allows the yard to ensure that new designs are always improving and lets the yard test its design concepts and to make sure they work before putting into production.

To further reduce the environmental impact of the ETERNAL PROMISE, the propulsion package was very carefully considered. The vessel features a Masson Marine W6400 gearbox with a 7.446 : 1 reduction, which coupled to the efficient, slow speed Mitsubishi S6R2 engine, results in a slow propeller speed of 181 rpm at full throttle, or around 110 rpm when trawling at typical loadings. Due to the lower propeller speed, a large 2.5 m four bladed skewed Kaplan propeller could be fitted, within modern propeller nozzle, both supplied by Teignbridge propellers UK. The propeller is 15% larger in diameter than the previous vessel and increases theoretical bollard pull by 5%.

The ETERNAL PROMISE also features two IMO Tier III certified engines. The main engine, a Mitsubishi S6R2-T2MPTK-T3 rated at 480 kW @ 1350 rpm, was supplied, and commissioned by Padmos in the Netherlands. Also provided was a dedicated SCR unit and urea/AdBlue system for this engine which allows the engine to meet the new, more stringent emission standards set by the IMO. The SCR unit, though physically large, was able to be fitted into the engine room and had a high noise reduction rating of 35 dBa, reducing the noise levels experienced both inside and on deck by the crew. As well as the main engine, the auxiliary engine which provides main hydraulic and backup electrical power onboard was also certified to IMO Tier III standards, and again features its own SCR unit and urea/AdBlue system. ETERNAL PROMISE is the fourth vessel built by the yard to feature IMO Tier III compliant engines.

The hull of ETERNAL PROMISE is built entirely from steel, apart from the wheelhouse and masts which are aluminium, and features a double chine hull form, curved transom stern and optimised bulbous bow. Below deck, from aft to forward, the vessel features the cabins, engine room, fish hold and a large freshwater tank forward of the collision bulkhead. Whereas above deck across the transom full width is the galley/mess, followed by accommodation and dry locker compartments, open deck space in way of the winches and an enclosed whaleback forward where the scallops are picked and sorted at the end of the conveyors.

A bespoke hydraulic deck machinery package was fabricated by the yard including two heavy duty split winches fitted with Hagglunds compact CA100 motors giving a core pull of 11 t each. Further to this a set of hydraulic tipping doors, outriggers and catch conveyors were fitted to both sides of the vessel, all manufactured in house by the yard. The two large Bopp gilson winches were supplied by J C Hydraulics and a MFB8 landing crane was supplied by Thistle Marine.

Primary hydraulic power is provided by a Tier III Doosan 4AD126 auxiliary engine providing 287 kW of power at 1500 rpm. An electric motor pump set retrieve system is also fitted.

Cooling systems for all engines and hydraulics onboard are served by box coolers supplied by Blokland Non-Ferro.

Electrical power onboard is provided by a Mitsubishi generator set supplied by Macduff Diesels Limited, with a rating of 98 kWe. As a backup a 98 kWe alternator was also fitted to the front end of the auxiliary engine, giving complete redundancy.

The electrical systems onboard were designed and fitted by R.D. Downie who also fabricated the vessels switchboard and control panels for all the pumps and motor starters.  In addition to this R.D. Downie also provided the fire, bilge and gas alarm systems onboard along with the navigation light panel and assisted with the installation of the navigation equipment.

The catch handling system built by the yard and Northeast Fabricators. The fish hold refrigeration system along with ice machine was supplied and fitted by Airo-tech Solutions Ltd and both are fitted in the forward whaleback.

The vessel was fully painted by the yard with International products applied to a comprehensive marine spec.

The high specification navigation package was supplied and fitted onboard by both Woodsons of Aberdeen and Furuno UK.

Hull development, construction drawings and stability information supplied by Macduff Ship Design

Mitsubishi S6R2 main engine supplied by Padmos, Netherlands

Propeller and Nozzle supplied by Teignbridge, UK

Gearbox supplied by Masson Marine, France

Generator set supplied by Macduff Diesels Ltd, UK

Auxiliary engine set supplied by Watermota, UK

Box cooling systems for each engine and the hydraulic circuit supplied by Blokland Non Ferro, Netherlands

Pumps supplied by Azcue Pumps SA, Spain

Deck machinery equipment supplied by the yard

Landing crane supplied by Thistle Marine, UK

Fire doors supplied by B-15 Marine Ltd, UK

Weathertight doors supplied by Winel, Netherlands

Triple rudder system supplied by the yard

Steering gear supplied by Scan Steering APS, Denmark

Wheelhouse windows and portlights supplied by HK Van Wingerden & An BV, Netherlands

Fish handling system and conveyors supplied by the yard.

Refrigeration system and ice machine supplied by Airo-tech Solutions Ltd, UK

Paint system by International, UK

Wheelhouse chairs supplied by Norsap, UK

Oil fuel filter/separator and main engine oil fine filter supplied by CC Jensen, UK

Pressure washers supplied by Grampian Power Clean, UK

Anchors and chain supplied by Fendercare Marine, UK

Switchboard and electrical system supplied and installed by R D Downie Limited, UK

 

 

Macduff Ship Design Tug deliveries and future projects

Macduff ship Design has seen a number of ASD tug deliveries over recent months and some interesting development work completed on future tug technology.

The most recent completion has been that of the 25m ASD harbour tug ‘PNT Bholu’.  The vessel was built by Karachi Shipyard and Engineering Works in partnership with Tor Group who provided a comprehensive design, material and supervisory support package.  Following successful trials, the vessel has now been delivered to the Pakistan Navy where it has started service.  The vessel is a 48 T bollard pull harbour tug and is powered by twin Cummins QSK50-M1 marine engines delivering 1529 Kw @1800 rpm.  These each drive a Schottel SRP 360 FP azimuth thruster fitted with a 2200mm fixed pitch propeller.  The vessel is fitted with a forward towing winches supplied by DMT and an aft towing bollard fitted with tow hook, and is fully FiFi equipped.

Further to this we have also seen over the past month the completion of the 30m ASD harbour tug ‘Abdul 11’.  The vessel was built by Tor Group and following successful trials has now been delivered to the owner The Urban Region of the Future, in Saudi Arabia.  The vessel is a 65 T bollard pull harbour and anchor handling tug and is powered by twin Cat 3516 marine engines delivering 2000 Kw @1600 rpm.  These each drive a Kongsberg 205S azimuth thruster fitted with 2500mm fixed pitch propellers.  The vessel is fitted with forward and aft towing winches supplied by DMT marine equipment who also supplied the small winches, capstans and chain stopper.  The vessel is also designed to complete anchor handling duties with a stern roller and shark jaws, and is fully FiFi equipped.

The third recent delivery is a landmark design for Macduff Ship Design being the first vessel designed for an Indian owner and built by an Indian shipyard.  The 21m ASD tug /service vessel, ‘River Pearl 10’, has been handed over to its owners Knowledge Marine & Engineering Works Limited by Synergy Shipbuilders from their yard in Goa, following successful trials where the vessel exceeded the contract requirements of 10 knots speed and 10 T bollard pull.  ‘River Pearl 10’ is designed as a multirole tug / service vessel with large open working deck aft, forward focsle and wheelhouse.  The main propulsion is provided by twin Cummins KTA19 M3 engines delivering 500 Hp @ 1800 rpm through twin Hydromaster Z drive ASD units all supplied by Parikh Power.  On deck there is a main aft towing bollard fitted with tow hook.

Late Summer also saw the delivery of a 30m ASD Harbour tug to its new owners PD Industries.  The vessel was built by Tor Group international for their own operations in 2022 and has now been renamed as ’Dalton Hunter’ and delivered to its new owners on the East coast of Canada.  The vessel is a 45 T Bollard pull harbour tug with forward winch and aft tow hook, and is fully FiFi equipped.

Further to these new vessel deliveries we have spent the past 6 months working closely within a consortium of companies including Harland and Wolff, Kongsberg and Echandia to develop the concept for a 25.5m 65 T bollard pull ASD battery electric harbour tug.  The aim of the concept is to develop a vessel that will meet the needs of most in harbour tug operations within the UK in full electric mode.  The vessel will be supplemented by two HVO driven generators for unusual operations including longer coastal voyages and tows to ensure a fully green solution to the requirements of this sector.  It is hoped that this concept can be developed into a working demonstrator and onto a product that Harland and Wolff can market to the shipping industry.  Beyond this exciting project we hope to be able to further develop the concept to apply to smaller and larger tugs and onto other vessel types.

 

 

21.0m ASD Tug ‘RIVER PEARL 10’ for Knowledge Marine & Engineering Works Limited

Macduff Ship Design is pleased to announce that the 21m ASD tug /service vessel, ‘River Pearl 10’, has been delivered to its owners Knowledge Marine & Engineering Works Limited.  The vessel was completed by Synergy Shipbuilders at their yard in Goa and has recently completed successful trials exceeding the contract requirements of 10 knots speed and 10 T bollard pull.

The vessel is a landmark design for Macduff Ship Design being the first vessel designed for an Indian owner and built by an Indian shipyard.  We are now working with a number of clients within the market and are looking forward to meeting them and other clients when we will be exhibiting on the Parikh Power stand at INMEX SMM India in October.

‘River Pearl 10’ is designed as a multirole tug / service vessel with large open working deck aft, forward focsle and wheelhouse.  The layout will allow for the vessel to complete a wide range of harbour operations including docking and undocking of vessels, marine services to anchored vessels including crew transfer, delivery of supplies and work with customs officers.

The vessel will operate on charter at Deendayal Port in Gujarat India and has been delivered following a year-long construction period which followed a detailed design process involving the owners, the shipyard and Macduff Ship Design.  ‘River Pearl 10’ is constructed entirely from steel to a hard-chine, hull form.  The design was a development of an existing proven hull which was further developed to provide the vessel with the required performance characteristics whilst maintaining the operational specification and owner requirements.

The main propulsion is provided by twin Cummins KTA19 M3 engines delivering 500 Hp @ 1800 rpm through twin Hydromaster Z drive ASD units all supplied by Parikh Power.  On deck there is a main aft towing bollard fitted with tow hook.  The vessel has ‘D’ fendering all around the vessel and ‘W’ style fenders around the bow to assist with pushing operations.  These are complemented by a further D fender positioned down the vertical bow.

The vessel is designed around a maximum complement of 10 with separate cabins for the Captain and Chief Engineer below the focsle deck and an 8 man crew cabin below the main deck casing.  The main deck casing houses a large galley mess area with seating for crew or up to 10 passengers. The forward compact wheelhouse offers commanding views all round with main steering console and a small crew seating area.

Vessel particulars

Length OA: 21.0 metres

Breadth: 7.2m

Depth: 3.0m

Maximum draft: 2.0 m

Fuel Capacity: 23,500 litres

Fresh Water Capacity: 7,500 litres