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Safe Towing: Calculating a towline’s catenary and sag

Introduction Towlines connect a tug to the vessel being towed and are defined by multiple characteristics like Weight, Diameter, and Stiffness. The tension in the towline during the towing operation is not static but keeps varying with the distance between the tug and...

Selecting the right equipment for towing operations – Emergency Towing

In Part 1 of the article, we discussed the regular towing arrangements and how to select the towing gear for the same. In this part, we will discuss the components of the emergency towing arrangement and how to select them. The purpose of emergency towing equipment is...

Selecting the right gear for towing operations – Part 1

Towing operations seem pretty straightforward – we just need to connect the vessel to be towed to the right sized tug and get started! However, a simple exercise of digging deeper will reveal critical items that we need to take care of. If we start thinking about the...

Why the bollard pull calculation method for a barge won’t work for a ship

In my working with the marine transportation industry for more than a decade now, I have come across many different calculations for required bollard pull for both barges and ships. The principles of the calculation are same, whether it is a ship, a barge or any other...

Bollard Pull Calculations – an Introduction (Part II)

Bollard Pull Calculations for Towing Operations Part II – Finding out the maximum feasible tow speed (To read Part I, please click here) Introduction This is Part – II of the two part article on Bollard Pull calculations. In the Part I we saw how to...

Bollard Pull Calculations – an Introduction (Part I)

Bollard Pull Calculations for Towing Operations – an Introduction Part I – Calculating the required Bollard Pull (BP) (Click here for Part II) SECTION A – INTRODUCTION Bollard Pull calculation is one of the most frequent calculations performed in...