Technical Articles Articles

The Optim22 method of hull optimization – Part 2

This is a follow-up article to the previous article on Framed Structures Optimization. 1.1 Abstract A previous article introduced the Optim22 method. This one adds additional background information plus 3 more case studies to...

The Optim22 Method of Weight Optimization of Framed Steel Structures

1 Abstract A semi-automated structural weight optimization system is presented for framed structures of post and beam construction which is based on basic structural member design principles. The approach is to adjust member properties in a manner that...

Combating rising seas with floating structures

Introduction Rising sea level is an existential threat for many coastal cities. The sea is rising subtly but relentlessly at an exponential rate. Many predictions of how high and how fast it will rise in the next 50 years have proved to be understated. According to...

How to identify the spoolpiece lifting points?

In the offshore construction industry, the connection between the newly installed pipeline and the riser is accomplished via a series of ‘spoolpieces’ (or spools). The spool is fabricated by welding pipe joints to form an L-shaped, Z-shaped, or possibly a straight...

Preparation for Dry-docking of an oil tanker: A Chief Engineer’s approach

Preparation for Dry-docking of an oil tanker: A Chief Engineer’s approach

Introduction Dry-docking of a vessel is required at every 5 yearly intervals to carry out inspection of hull,...

Using simple tools for efficient Passage Planning for seagoing vessels

Using simple tools for efficient Passage Planning for seagoing vessels

Introduction Planning a vessel’s voyage is a critical detailed exercise, and the main goal is to ensure safe and...

Designing a closed chock as per IACS rules

Designing a closed chock as per IACS rules

Introduction Chocks are used universally for mooring and towing operations on ships. For towing operations,...

Designing a clip/dog plate for seafastening

Designing a clip/dog plate for seafastening

Introduction In an earlier article, we saw how to design stoppers for seafastening. Stoppers are items that are used...

The Bulbous Bow – types, characteristics, and effects

The Bulbous Bow – types, characteristics, and effects

This is Part 2 of the two-part series on Bulbous Bows. For Part 1, click here By Tamal Mukherjee, *This...

Marine Propeller and Shafting Alignment – Part 2

Marine Propeller and Shafting Alignment – Part 2

Gap & Sag Alignment Gap and Sag Alignment is carried out to bring the engine to its final position, in case of...

Marine Propeller Shafting and Shafting Alignment – Part 1

Marine Propeller Shafting and Shafting Alignment – Part 1

*****This article first appeared in July 2018 edition of Marine Engineers' Review (MER), India. We're reproducing it...

Using Class Rules to assess the Longitudinal Strength requirement of Barges

Using Class Rules to assess the Longitudinal Strength requirement of Barges

Introduction The longitudinal strength of a vessel is integral to its evaluation for a given purpose. To get an...

The four important factors for a ship’s windage area calculations

The four important factors for a ship’s windage area calculations

Introduction The windage area of a vessel or offshore structure is the area that is exposed directly to the wind. As...

How soil vertical stiffness parameters affect buried pipelines

How soil vertical stiffness parameters affect buried pipelines

Introduction Pipe soil interaction is a critical subject of analysis in the field of the offshore industry. A pipe...

Three simple but useful calculations when towing a Vessel

Three simple but useful calculations when towing a Vessel

In this article, we will explore three simple but useful calculations that can be used for towing operations. They...

The why and how of freeboard calculation of a ship

The why and how of freeboard calculation of a ship

Introduction Freeboard is a common term used in vessel operations. Freeboard is the smallest vertical distance between...

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