9.2.8 Towing 

Explain:

- The contents of emergency towing booklet

- Emergency towing arrangements,

- Procedure and tools for towing,

- Procedure for towing in good and rough weather conditions, 

- Calculation of bollard pull and towing speed prior towage

Towing operations play a significant role in maritime operations, such as assisting disabled vessels, salvage operations, or escorting operations. In accordance with maritime regulations and best practices, the following technical explanations are provided:

Contents of Emergency Towing Booklet:

The Emergency Towing Booklet is a document that provides essential guidance and information for towing operations. Its contents may include:

Towing Procedures: Detailed procedures and guidelines for preparing and conducting towing operations, including pre-tow preparations, connection methods, and emergency procedures.

Towing Arrangements: Information on the towing arrangements, such as the type of towing gear, winches, wires, ropes, bridles, and other equipment required for safe and effective towing.

Towing Limitations: Limitations and recommendations for safe towing operations, including maximum allowable towline forces, speed restrictions, and weather-related considerations.

Communication Protocols: Guidelines for communication between the towing vessel, the vessel being towed, and other involved parties to ensure effective coordination and response during the towing operation.

Emergency Procedures: Clear instructions for handling emergency situations during towing, such as parting of the towline, loss of steering control, or engine failure.

The Emergency Towing Booklet serves as a valuable resource for towing operators, providing essential information for safe and efficient towing operations.

Emergency Towing Arrangements:

Emergency towing arrangements refer to the equipment and preparations required on vessels to facilitate emergency towing. These arrangements typically include:

Towing Points: Designated points on the vessel's hull or structure where towing connections can be made securely.

Towing Pennants: Strong ropes or wires used to connect the towing vessel and the vessel being towed.

Towing Bridles: Rigging arrangements used to distribute towing forces evenly and reduce stress on the vessel being towed.

Towing Hardware: Shackles, hooks, and other fittings used for connecting the towing gear and securing the towline.

The emergency towing arrangements should be designed, maintained, and tested to ensure their reliability and effectiveness during emergency situations.

Procedure and Tools for Towing:

The procedure for towing involves several key steps:

Pre-Tow Assessment: Assessing the vessel to be towed and its condition, including hull integrity, stability, and the presence of any hazards.

Towing Connection: Making secure and reliable connections between the towing vessel and the vessel being towed using appropriate towing gear, such as wires, ropes, or chains.

Towing Force Calculation: Calculating the required bollard pull, which is the pulling force exerted by the towing vessel, based on factors such as the size, weight, and condition of the vessel being towed, and the prevailing weather conditions.

Towing Speed Determination: Determining the safe and suitable towing speed, considering factors such as the vessel being towed, sea conditions, and the capabilities of the towing vessel.

Monitoring and Adjustments: Continuously monitoring the towing operation, adjusting the towing gear, bollard pull, or speed as necessary to ensure safe and efficient towing.

Tools used for towing operations may include winches, fairleads, towing pins, and other equipment specifically designed for handling towing operations safely and effectively.

Procedure for Towing in Good and Rough Weather Conditions:

The procedure for towing can vary depending on weather conditions:

Good Weather: In good weather conditions, towing operations can be conducted with less risk and fewer limitations. However, it is still essential to follow established procedures, ensure proper communication, and monitor the towing operation closely.

Rough Weather: In rough weather conditions, towing operations require extra precautions. These may include reducing towing speed, adjusting the towing gear and force, and considering the vessel's stability and the integrity of towing connections to withstand higher forces caused by waves and wind.

Towing in rough weather conditions should be carefully assessed and, if necessary, postponed or modified to ensure the safety of the vessels involved and the crew.

Calculation of Bollard Pull and Towing Speed Prior to Towage:

Prior to initiating towing operations, it is important to calculate the bollard pull and towing speed. The bollard pull is the force required to tow a vessel or object, and it is influenced by various factors, such as vessel size, resistance, and environmental conditions. The towing speed should be determined based on factors such as the size and condition of the vessel being towed, prevailing weather conditions, and the capabilities of the towing vessel.

These calculations help ensure that the towing operation is conducted within safe limits, maintaining control and minimizing risks associated with excessive forces or speed.

It is important to note that specific towing procedures, tools, and calculations may vary based on vessel type, purpose of towing, and applicable maritime regulations and industry best practices.

References:

International Maritime Organization (IMO) Guidelines for Towing Operations