Tugnology '19 Liverpool | Speakers and Papers

Sponsors & supporting media

As always, during the conference sessions, the emphasis is very much on discussion and to this end pre-prints of the majority of papers are made available to registered delegates via our website two weeks prior to the start of the conference in order to prepare questions. Delegates can then print out hard copies of the papers of most interest to them. Complete folders containing all the papers will be supplied when delegates register and pick up their name badge at the event. The conference will be chaired by Mike Allen, long-standing ITS Convention chairman.

Click on a paper to view the synopsis. View all.

A Harmonised Bollard Pull Trial Test Procedure

Dr Thijs Hasselaar, Project Manager, Trials & Monitoring Department, MARIN (Maritime Research Institute Netherlands), The Netherlands

Over the past 3 years, MARIN, together with 30 leading industry partners and class societies, has developed a harmonised procedure for the execution of bollard pull trials. Through model tests, CFD and full scale trials, the factors affecting tug performance during a bollard pull have been investigated. The results have been used to develop a proven methodology to deliver reliable, repeatable and transparent performance figures for tugs. This paper details the procedure, and gives an overview of the research conducted in the bollard pull JIP.

Advanced Variable Drive - Proven Technology for a Hybrid Age

Capt Gary Dockerty, Sales Director MEA, Sanmar Shipyards, United Arab Emirates

Nathan Kelly, Product Development Manager, Caterpillar Marine, USA

Turkey-based Sanmar Shipyards has co-operated with Caterpillar Marine on a tugboat incorporating a hydraulic 'hybrid' propulsion system. The Cat Marine Advanced Variable Drive (AVD) is a patented system leveraging Caterpillar's extensive experience with integrated power systems technology. Sanmar, with over 40 years of experience in the tug building industry, is looking again to break new ground following on from being the world's first builder of LNG-powered tugs, as well as the builder of the world's first commercial remotely operated vessel. This paper outlines the experience gained and outcomes achieved through this strategic development, which is expected to provide a highly optimised, lower-cost alternative to conventional electric hybrid systems with similar benefits regarding improved performance and lower emissions, while maintaining a low noise profile. The objective is to deliver all the benefits of a variable speed diesel electric propulsion (DEP) system, with the addition of potential cost and size advantages.

Data Analytics in the Tug Industry

Solon Pavlioglou, R&D Engineer, Damen Shipyards, The Netherlands

Staying at the forefront of the digital era, the use of remote monitoring to obtain and collect large amounts of data from real-life tug operations is ever more essential. Big data analysis helps understand equipment performance, allowing for operational fine-tuning and design improvement. This paper highlights promising areas of big data research at Damen, and the way in which these techniques are implemented to improve operational understanding and support, as well as vessel design. Multi-dimensional regression techniques are used to explore the correlation between, for example, fuel consumption and various operational parameters. These techniques constitute the cornerstone of benchmarking. Through connectivity and digitisation, we can become better acquainted with the operational side of our vessels: continuous monitoring of the vessel's location and speed translates into a time-speed histogram; clustering and classification techniques use data from multiple sensors to automatically identify operational modes. A preliminary approach for condition based maintenance has been investigated by means of the analysis of measured vibrations, while machine learning techniques have enabled the identification of the key traits of a monitored system. The aforementioned topics are only a few examples of the multiple digital technologies that Damen is currently exploring, and that will positively impact the vessels of the future.

Development of a Mechanical-Electric Hybrid ASD Tug

Jonathan Parrott, Senior Naval Architect, Jensen Naval Architects and Marine Engineers, USA

Jensen has been working with Rolls-Royce on a mechanical-electric hybrid propulsion system for ASD tugs to boost available power to the drives. Currently under construction is a 100ft (30m) tug for BayDelta that utilises lower HP EPA Tier 3 main engines and an electric motor on each drive to maintain the same bollard pull rating as its sister ships. It is envisioned that the vessel will be able to transit and maintain station keeping using the diesel generators and electric motors without the main engines running, reducing emissions as well as maintenance and operating costs.

Escort Tug Safety - Accounting for Dynamic Scenarios in Design and Operations

Robert Allan, Executive Chairman, Robert Allan Ltd, Canada

Brendan Smoker, Mechanical Engineer and CFD Analyst, Robert Allan Ltd, Canada

Building on discussions at past Tugnology conferences, this paper examines some dynamic scenarios possible during escort tug operations, such as loss of towline or thrust and transitional manoeuvres, and how they relate to present stability criteria based on 'idealised' zero-speed residual righting energy. Using CFD, we show how actual residual righting energy can be affected by escort hydrodynamics at speed. We also demonstrate how numerical simulation lets us predict how well an active escort winch reduces escort tug motions in seas. Finally, we propose a collaborative path toward improving criteria for escort tug design and operations that account for 'real-world' dynamics.

Innovate Your Business Model by Using the True Power of Big Data Analytics

Florus Wilming, Founder & Director, Onboard, The Netherlands

The maritime industry is relatively advanced when it comes to technological progress. Automation is well-established, and vessels, platforms, ports and terminals are filled with sensors. However, the industry still lags behind in accepting new forms of digital technology. As the Internet of Things (IoT) increasingly weaves itself into our lives, nothing is stopping us from moving forward. We have all the opportunities we need to truly analyse how to use big data intelligently, and apply it to tug, towage, salvage and OSV business models and supply chains. We are ready to embark on this journey of digitalisation. This paper presents a case study on how to use big data to optimise terminal towage operations by Kotug Seabulk Maritime - a joint venture between Kotug International, Seabulk Towing and Buckeye Partners - at the Buckeye Bahamas hub in the Caribbean region and onboard.

Integrated Propulsion Systems for the Tug Industry

Jonas Nyberg, Product Manager, Marine Propulsion & Integration, Caterpillar Marine Solution Center, Sweden

Over the years, the importance of reducing installation costs for tugboats has grown in a market where competition between builders and operators is continuously increasing. Engines, propulsion and controls still represent a major part of the equipment cost of a vessel, and exist in a variety of configurations, all with their individual benefits. During the last few years, Caterpillar has introduced a series of integrated high speed engine and propulsion packages, with the goal of providing a simpler, more efficient solution to builders, designers and operators. This paper discusses the benefits of an integrated package, and how this can provide value to today's competitive tug building industry.

Monitoring Tug Performance by Analysing Real-Time and Sea-Trial Data

Ibna Zaman, Project Engineer, Royston Ltd, UK

Dr Serena Lim, Research Associate, Newcastle University, UK

A digital revolution is currently taking place in the maritime industry to tackle the challenges of new regulations and energy efficient operations. This is driving the industry to explore different energy efficiency measures, hybrid propulsion, alternative fuels, remote operations and autonomy. This transformation also affects the tugboat industry, where digitalisation of information has spurred the automation of existing processes and functions, and has had a significant impact on operations. Vessels are becoming sophisticated sensor hubs and data generators. With advanced communication systems, ship connectivity now enables telemetry of massive volumes of data. Big data platforms will have an incredible effect on how vessels manage information and real-time analytics for performance monitoring. A large amount of real-time data is generated from smart sensor networks and manual data from various sources, such as sea trials. This paper demonstrates how such data has been integrated and synchronised from different sources in order to monitor and optimise vessel performance.

Moving Safely into the Digital Age

Eva Peño, Global Market Leader OSV & Tugs, Bureau Veritas Marine & Offshore, France

The time has come for the shipping industry to undergo its own digital transformation. Tugs - considering their function, operational profile and cost base - are well suited to take the next step. However, as much as digitalisation is a great opportunity to improve safety, reliability and to reduce costs, the industry will have to face up to the associated cyber risks. This paper will explain how these risks can be identified, analysed and assessed, and how appropriate mitigation measures can be defined to ensure safe onboard implementation of the new technologies.

Rosmanditen: A Theoretical and Experimental Insight into ASD Tug Manoeuvrability

Lucia Enoizi, Project Engineer, Rosetti Marino SpA, Italy

A co-operative research programme between Rosetti Marino shipyard and the Marine Technology Department (DITEN) of Genoa University has led to a new tug design, which embeds side damage survivability and low-to-high escort capabilities, as well as a simulation tool for evaluating the manoeuvrability of ASD tugs at high speed (escort) and low speed (harbour assistance) in a MATLAB-SIMULINK environment. The tool can simulate tug performance using different skeg sizes, propulsor sizes, engine powers and winch maximum tensions. The research programme involved the use of large towing tank tests, CFD simulations, the identification of manoeuvring and propulsion models, and full scale validation trials

The Kawasaki Advanced Hybrid System

Tatsuya Ohno, Manager, Kawasaki Heavy Industries Ltd, Japan

Emissions requirements in harbour areas have recently been getting stricter. Batteries and LNG have been proposed as a means of solving this problem, but such technology requires much more investment than that involved in a conventional tugboat. In this paper, KHI will propose a patent-pending new concept to resolve this issue.

The Mechanical Hybrid Tug

Tobias Oser, Sales Manager Tug & Offshore Energy, Schottel GmbH, Germany

We are seeing increasing demand across the world to save fuel and reduce emissions, especially when operating close to urban or environmentally protected areas. The answer is often believed to be hybrid or diesel electric tugs. However, despite the apparent growing demand for such tugs, only 2 per cent of azimuth thruster driven tugs delivered between 2009 and 2019 are hybrid or full diesel electric, presumably due to the higher Capex and complexity of such systems. This paper will introduce a mechanical propulsion system that enables the operator to drive two thrusters with one engine. The system is less complex and needs less capital expenditure, but offers almost the same major benefits as a hybrid system (without using a complex electric system or standalone gearbox): reduced fuel consumption, emissions reduction, and increased MBTO of the main engines and FiFi without using a separate FiFi pump engine.

The Modular Caliper-Winch Concept

Marinus Jansen, Technical Innovations Manager, Rotortug BV, The Netherlands

Modern winch systems, such as render and recovery winches, have developed into overly complex pieces of machinery, with some winch manufacturers copying each other's concepts. The result of this development is a fundamental disconnect between winch design engineers' construction goals, end-user expectations and stakeholder management. The modular Caliper-Winch concept aims to simplify winch design and construction, and emulate advanced render and recovery functions using an advanced drive, brake control system and brute forcing principle functions. The innovative design provides improvement in the following areas: a small winch footprint, reduced power consumption, improved control, easy maintenance, redundancy of key-features, no gearbox, less weight and a safe emergency quick release option. This paper focuses on a modular winch concept, breaking down the principle drive and brake systems into multiple redundant subsystems, including an advanced dynamic control system to emulate high-end winch performance at a fraction of the cost. This development is a co-operative effort between Kotug International, Tugpins and Rotortug.

The Vital Connection

Jacco van Snippenberg, Group Lead Tug & Towing, Lankhorst Ropes, The Netherlands

This paper presents a timely review of towing line connections between main lines and pennants. Typically, towing rope configurations consist of various rope types with different physical and mechanical characteristics. Understanding their strengths and weaknesses is important in ensuring safe and reliable connections, especially when connections need to be made quickly, without delay, during towing. In addition to examining the different types of towing connections in detail, this paper will consider the implications of new connection developments, and include case studies. Throughout the review, the focus will be on reducing the cost of ownership without jeopardising safety.

Ultrasound and the Future of Anti-Fouling Internal Cooling Systems and External Surfaces

Dominic Findlow, Technical Director, NRG Marine Ltd, UK

New environmental and invasive species regulations are forcing ship owners to adopt different systems and operational regimes to control the build-up of bio-fouling on the inside and outside of their vessels. In this paper, NRG Marine uses its experience from recent tug installations and the latest field research to look into the future of this fundamental part of ship operation, in advance of expected legislative changes aimed at negating the use of copper. We present the latest findings and cost comparisons for typical box-cooler installations, and offer some insight into other comparable anti-fouling systems.