Introduction
If you’re completely new to ships, this article is for you.
You don’t need a marine engineering degree, and you certainly don’t need sea-going experience. I’ll explain the basics of bulk carrier structures in plain English while sharing a few lessons I learned during my own career as a marine engineer.
Ironically, the most useful things I know today are some of the same topics I found incredibly boring as a first-year university student.
Looking back, I wish I had paid a little more attention.
I Still Remember My First-Year Marine Engineering Class
One memory has stayed with me ever since my first year at Korea Maritime University.
It was our first ship structure class.
To be completely honest, I wasn’t interested at all.
Frame.
Girder.
Stringer.
Longitudinal.
Bulkhead.
At the time, they all sounded like a completely different language.
Our professor, who had previously worked in a shipyard, said something that seemed almost cliché back then.
“You may not understand why this matters today, but one day you’ll be glad you learned it.”
Like many freshmen, I smiled, took a few notes, and didn’t think much about it.
Fifteen years later…
I finally understood exactly what he meant.
Why Talk About Bulk Carriers?
People sometimes ask why I write so much about bulk carriers.
The answer is actually quite simple.
When you look at the world’s commercial fleet by deadweight tonnage (DWT), bulk carriers make up a huge percentage of it.
They transport iron ore, coal, grain, cement, fertilizer, and countless other raw materials that support everyday life.
Most people never see these ships.
But without them, modern industries would struggle to function.
In many ways, bulk carriers are the “textbook” ships of the maritime industry.
If you understand how a bulk carrier is built, you’ll find it much easier to understand many other types of ships as well.
A Bulk Carrier Is Basically a Giant Floating Warehouse
One question I hear quite often is,
“Aren’t all ships basically the same?”
Not really.
The easiest way to picture a bulk carrier is to imagine an enormous floating warehouse.
Instead of carrying containers, it has several huge cargo holds.
These cargo holds are designed to transport dry bulk cargoes such as:
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Iron ore
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Coal
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Grain
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Cement
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Bauxite
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Fertilizer
Once I started looking at bulk carriers this way, understanding their overall layout became much easier.
Sometimes simplifying a concept is the best way to learn it.
Learn the Directions Before Memorizing the Structure
One mistake I made as a student was trying to memorize every English term immediately.
Looking back, I think I approached it the wrong way.
Before learning complicated structural names, it’s much more helpful to understand the basic directions onboard.
There are only four you really need at first:
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Port – Left side of the ship
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Starboard – Right side of the ship
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Forward (Fore) – Front of the ship
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Aft – Rear of the ship
Once these become second nature, understanding structural drawings becomes much less intimidating.
I remember struggling with these words during university.
After a few months at sea, they became part of my everyday vocabulary without me even realizing it.
Why Does a Ship Have a Double Bottom?
This was one of the first questions I asked myself during ship structure class.
Why would anyone build two bottoms instead of one?
The answer became much clearer after I started sailing.
A double bottom acts as an additional layer of protection.
If the outer bottom is damaged by grounding or collision, the inner bottom may still remain intact, helping prevent flooding.
The space is also commonly used for ballast water, which helps maintain the ship’s stability during different loading conditions.
Sometimes the simplest design features turn out to be the most important.
Frames, Girders, and Stiffeners Are Like a Ship’s Skeleton
This was probably the topic I struggled with the most as a student.
There were so many names.
Frames.
Girders.
Stiffeners.
Longitudinals.
At first, they all blended together.
Then someone explained it in a way that finally made sense.
Think of them as the ship’s skeleton.
Just as our bones support the human body, these structural members keep a ship strong enough to withstand waves, cargo loads, and years of operation at sea.
Once I started thinking about them that way, everything became much easier to understand.
Today, whenever I look inside a cargo hold or ballast tank, I naturally notice these structural members first.
Why Ship Structure Matters to Marine Surveyors
Working as a marine engineer taught me a great deal about machinery.
Preparing for marine survey work taught me something else.
Surveyors don’t only look at engines.
They also evaluate the ship’s structure.
That means understanding areas such as:
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Hopper Knuckles
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Lower Stools
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Side Shells
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Topside Tanks
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Bulkheads
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Hatch Coamings
Without a basic understanding of these components, it becomes difficult to communicate effectively during inspections.
Ironically, I found myself returning to the same subjects I had learned during my first year at university.
Only this time, they finally made practical sense.
Bulk Carriers Continue to Evolve
Modern bulk carriers are very different from those built several decades ago.
Environmental regulations continue to influence ship design.
Today, shipowners must consider requirements such as:
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EEXI
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CII
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Decarbonization
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ESG initiatives
Some newer bulk carriers are even being designed to operate on LNG or other alternative fuels.
Having spent part of my career on LNG carriers, I’ve found these developments particularly interesting.
The industry’s priorities are changing.
It’s no longer just about carrying more cargo.
Efficiency, emissions, and sustainability have become equally important.
Everything Eventually Connects
If you’re currently studying ship structures, you might feel overwhelmed.
I completely understand.
I felt exactly the same.
Back then, structural drawings looked confusing.
The terminology felt endless.
I couldn’t see how any of it would matter once I graduated.
Looking back now, I realize every Frame, every Girder, every Bulkhead, and every Stiffener eventually became part of my everyday work.
Whether I was sailing as a marine engineer, preparing for inspections, or studying structural defects, everything traced back to those first-year lectures.
My professor was right all along.
I just needed fifteen years to fully appreciate it.
Final Thoughts
Ship structures aren’t the most exciting subject when you’re sitting in a classroom.
I know that because I once sat in the same seat.
But if you’re planning to become a chief engineer, a marine surveyor, a superintendent, or even a shipyard engineer, you’ll eventually discover that structural knowledge is impossible to avoid.
One day you’ll be walking across a ship’s deck, standing inside a cargo hold, or inspecting a ballast tank.
When that day comes, those unfamiliar words from your first-year textbook will suddenly make perfect sense.
So if you’re a student reading this today, don’t worry if everything feels confusing.
Keep learning.
One day, just like me, you’ll probably remember something your professor once said and realize…
He was right.