Tug masters experience the effects of a tug's stability every day when manoeuvring their vessel, either free sailing or when assisting ships. During tug operations, a number of forces and combinations are working on a tug – such as towline, hydrodynamic, steering and propulsion forces – often at or near their maximum with respect to the tug's stability. It is, therefore, not just desirable but necessary for tug masters to have at least a basic idea of the elements of stability. They need to know where the limits are, and what the consequences could be, if the tug or tug handling practices don't conform to the rules of stability – not only in normal circumstances but also when extreme conditions, such as dense fog and storms, occur. The consequences can be very dramatic. Numerous harbour tugs have capsized, often with tragic consequences. In the tug capsizes known to have occurred between 2010 and 2015, more than 45 people have drowned. This educational guide to stability specifically for tugs aims to provide this important information to tug masters. It is written in a manner readily understood by all tug masters, regardless of their education, formal qualifications, nationality or operational backgrounds. The text is accompanied by numerous illustrations and photographs. In writing this handbook, the authors master mariner and pilot Captain Henk Hensen and naval architect Dr. Markus van der Laan have focussed on the practical aspects of stability, tug design and equipment and also on the consequences of unsafe procedures. Their emphasis is on harbour tugs, although several of the topics covered apply equally to seagoing tugs." The authors have produced an original and valuable training guide which will increase the knowledge of tug stability within the industry, and so enhance the safety of tugs, tug crew and the ships they support. It is hoped that this increased knowledge will indeed enhance safety and help to protect the marine environment." Ashok Mahapatra Director, IMO Maritime Safety Division. "This tug stability book will greatly contribute towards safer towage operations by enhancing the working knowledge of tug masters. It is an important publication for all tug masters and towage managers, no matter what facet of the towage industry they are engaged in." Arie Nygh ITA Patron; Managing Director, SeaWays Consultants.

Published by the ABR company
Visit: www.tugandosv.com

Towing Line / Hans van der Ster