tugline

Tugline refers to the line or hawser used to tow a vessel by a tug during towing operations. In maritime practice, a tugline is the primary connection between the tug and the towed object and serves to transfer pulling force while accommodating movement and shock between vessels. It may be called a towline or hawser, and its selection depends on factors such as load, distance, and environmental conditions.

Towlines can be made from traditional steel wire rope or modern synthetic fibers such as HMPE, nylon, or polyester. Synthetic lines are lighter and offer certain advantages in stretch and handling, while steel towlines provide high strength in heavy-duty applications. Towlines are sized by breaking strength and working load, with safety factors applied according to applicable regulations and standards.

In use, a tugline is attached to the tug’s towing point or winch and to a designated towing point on the towed vessel. Protection for the line is provided by chafing gear, bridles, or fairleads to minimize wear. A messenger line may be used to pass the towline between vessels when direct access is difficult. For long or heavy tows, multiple lines or bridles may be deployed to distribute load and reduce peak tensions.

Maintenance and safety are essential: operators monitor tension, avoid knots or kinks, keep the line clear of propulsion systems, and inspect regularly for wear, corrosion, fraying, or damage. Towline configurations and procedures vary by operation, including harbor tugs, salvage tasks, and offshore towings.

See also: towing, hawser, bollard, winch, salvage.