Bart 🌊⚓️ Profile picture
Senior Maritime Pilot | Master Mariner | Master's degree Nautical Science | Forensic Medicine | Glassblower |
Mar 5 14 tweets 6 min read
1/x So now I get the question: "So many Lloyds? Lloyd's of London, but I also hear about Lloyd's Register? Are they the same?" Well... no... but they share the same history. A little 🧵 2/x We're back in Edward Lloyd's Coffee House on Lombard Street. In 1696, Lloyd launched "Lloyd's News," a thrice-weekly sheet on arrivals, departures, and wrecks. Underwriters bet fortunes on ships based on rumors so they crave reliable facts. Image
Image
Mar 4 19 tweets 6 min read
1/x I've explained what a P&I Club is in shipping, but who or what is Lloyd's of London, and how are they related to these P&I Clubs? Here’s another small 🧵 2/x Around 1685–1687, Edward Lloyd opened his coffee house on Great Tower Street near the Thames. It specialized in shipping news for sailors, merchants, and captains. Image
Mar 3 23 tweets 7 min read
1/x Insurance for ships is a complicated matter, and you've probably heard "P&I Club" being mentioned. What is a P&I club? A small🧵 Image 2/x P&I Club stands for Protection & Indemnity Club.
"P" = protection (e.g. certain damage to your own ship).
"I" = indemnity (reimbursement) for third-party liabilities from operating the ship, like injuring crew, damaging cargo, or polluting the sea.
Mar 2 7 tweets 2 min read
1/x ER and ECR of an Aframax Crude Oil Tanker. Aframax is a class of mid-sized oil tanker that has a deadweight ranging from 80,000 to 120,000 tonnes. They are designed to comply with the AFRA (Average Freight Rate Assessment) system. 2/x If you think Aframax has something to do with the African trades, you’re not alone. There are two prominent sets of ship size nomenclature in the wet bulk world. They have been established for a long time, leading to overlap and confusion.
Mar 1 13 tweets 7 min read
1/x OK, leaving the subject of the day, but still having a link with Hormuz and tankers being attacked in this thread. I'm going to talk about the longest ship the world has ever seen: The Seawise Giant, and how she was on the receiving end of some Iraqi bombs Image 2/x With an LOA (Length Over All) of 458.45m (1504ft), the Seawise Giant was the longest self-propelled ship in the world. She was an oil tanker, built in 1979 by Sumitomo Heavy Industries in Yokosuka, Kanagawa, Japan. Fully laden, its displacement was 657,019 tonnes. Image
Feb 25 19 tweets 9 min read
1/x The transportation of vehicles across oceans relies on specialized vessels known as Pure Car Carriers (PCCs) and Pure Car and Truck Carriers (PCTCs). These ships function as multi-level floating parking structures. A🧵 about their history. Image 2/x The largest PCTC to be launched is the new Glovis Leader, which was floated out at the end of January. It will have a capacity of 10,500 CEU (Car Equivalent Units). Wallenius Wilhelmsen is working on a class that will have a 11,700ceu capacity. Image
Feb 24 28 tweets 8 min read
1/x What is the collision bulkhead of a ship? A ship is traditionally divided into multiple watertight compartments along its length to limit flooding to one or more compartments in the event of damage. This design prevents progressive flooding. Image 2/x (i.e., the ship filling up along its entire length no matter where the damage occurs). The subdivision is done using transverse watertight bulkheads, or simply "bulkheads." So how many watertight bulkheads does a given ship actually need? Image
Image
Feb 21 29 tweets 10 min read
1/x Have you heard of the SS Richard Montgomery, often dubbed the "Doomsday Wreck"? This shipwreck is considered one of the most dangerous in the world, resting in the Thames Estuary near Sheerness, Kent, just a mere 30 miles (48 km) from the outskirts of London. A small🧵 Image 2/x The SS Richard Montgomery was one of over 2,700 Liberty ships mass-produced by the US during WW II to support the Allies. Her keel was laid down on March 15, 1943, and the ship was launched on June 15, 1943 by the St. Johns River Shipbuilding Company in Jacksonville, Florida Image
Image
Image
Feb 14 23 tweets 8 min read
1/x Thanks @uk_ktee7484 for reminding me of this one. One of my first threads on X (still Twitter at that time) was about the longitude problem. So I've translated it and updated it a bit, so here goes: Why is exact time-keeping so important on board a ship? A small 🧵 Image 2/x A position is defined by latitude (LAT), longitude (LON), and altitude (H), but we can ignore the last one since we're at sea level. We can find LAT very easily with a sextant observation of the sun or... Image
Feb 5 32 tweets 12 min read
1/x OK, you perverts all seem very attracted to Kelvin's Balls, so I'll give you some more of them and continue talking about magnetism and the ship's compass. Strap in, it's a long, nerdy ride. 2/x We know that the Earth has a magnetic field. This magnetic field exerts influence on all objects on Earth. A ship, while under construction, acquires permanent magnetism from the operations it undergoes in the Earth's magnetic field. Image
Feb 4 18 tweets 8 min read
1/x I've updated and translated an older thread I posted in Dutch. What are the balls (spheres) next to a magnetic compass? They're Kelvin's Balls. Why are they there? Image 2/x A magnetic compass points to the Compass North (Nc), not to magnetic north (Nm). Sometimes Nc = Nm, but on a steel ship that's not the case. Also, the magnetic north does not coincide with geographic north (true north - Nt) Image
Feb 2 16 tweets 7 min read
1/x So you've seen photos or video of ships in drydock and you've probably noticed that those ship don't just sit on the bottom of the dock, but they are resting on blocks, placed underneath the ship. How does that work? A small 🧵 Image 2/x Precise positioning on keel and side blocks is essential to avoid damage or capsizing. Keel blocks are positioned with extreme care. Ships have numerous underwater openings: echo sounders, speed logs, tank drain plugs, sea chests, valves, propeller shaft bearings, etc. Image
Jan 29 16 tweets 8 min read
1/x So you probably saw this footage of the cruise ship Scenic Eclipse II being rescued by the USCG Cutter Polar Star. So when can a ship sail in ice? A small 🧵 2/x Ships designed for ice navigation must meet specific construction standards, not only icebreakers but also merchant vessels with an "ice class" rating to operate in icy conditions. Image
Jan 27 23 tweets 7 min read
1/x The "GREENLAND" problem" ... OK, maybe not the political one, but the "why is it so big?" problem. We can all blame it on one Belgian (Flemish guy) who has been dead for almost 450 years: Gerardus Mercator or Gerard De Kremer Image
Image
2/x By the mid-16th century, European seafaring had changed radically. Voyages were now long and transoceanic. Navigation relied on:
- the magnetic compass
- dead reckoning (course + speed + time)
- increasingly reliable latitude observations Image
Jan 26 25 tweets 9 min read
1/x Today we're going to talk about the barrel. No, not a whiskey barrel, but an oil barrel. We all hear on the news sometimes "the price of a barrel of oil." But what is that barrel, and what does it mean, for example, for an oil tanker? Image 2/x A barrel or "bbl" is the unit we use when trading crude oil. How big is a bbl, and how did we get there? A bbl is 159 liters or 42 US gallons. It originated in the mid-19th century in the oil fields of Pennsylvania, US. They had to transport the oil in something. Image
Jan 25 20 tweets 6 min read
1/x Some of you saw this post and assumed this is how they clean the cargo tank of an oil tanker as well... Not really... A small 🧵 on how they do it there... 2/x So today, a short piece about COW... No, not the milk-producing type, but Crude Oil Washing, or washing with crude oil. That's right.. we're washing with oil. Image
Jan 23 24 tweets 9 min read
1/x The media likes to freak out about Tsunamis, but for mariners they're less of a problem. What is a problem? Rogue waves or "killer waves"... A small 🧵 Image 2/x First of all... what's the difference between a tsunami and a rogue wave? A tsunami originates because of a geological event: underwater earthquakes, landslides, volcanic eruptions, or rarely meteor impact, displacing huge volumes of water. Image
Jan 20 16 tweets 6 min read
1/x VLCCs (Very Large Crude Carriers) have been somewhat in the news lately. They're carrying lots of crude oils or derivates around which, under the right (wrong?) circumstances, are combustible. So you might ask: why don't we hear about oil tankers exploding? Image 2/x Indeed, it doesn't happen very often that a tanker actually explodes. The last major explosion (not a fire, but an explosion) was the tanker SS Sansinena in 1976. This ship (246m) exploded in Los Angeles after discharging its cargo of 90,000 m³ Indonesian Light Crude. Image
Image
Jan 14 15 tweets 6 min read
1/x A rusting pile of junk... How can we prevent, or at least limit, a ship from rusting away in salt water? Well... paint would be your first answer... but then we have to talk about the HUMAN sacrifice.. ok, ok, not a human sacrifice, but an ANODE sacrifice... Image 2/x Ships operate in seawater, a highly corrosive electrolyte (conductor) that accelerates rusting of steel hulls through electrochemical corrosion. It's like an unwanted battery effect. Different parts of a ship’s metal structure have slightly different electrical potentials.
Jan 13 20 tweets 7 min read
1/x OK, we all know (I guess) that a ship can turn by moving a rudder. But is a rudder, a rudder, a rudder? No... There are different types of rudders and, especially as a maritime pilot, we always want to know what kind of rudder is fitted to a vessel. A small 🧵 Image 2/x Let's start with an image we are familiar with: the traditional rudder like we see on photos from Titanic era ships. Titanic's rudder was massive at 78ft (23.7m) tall and weighing 101 tons. But it is what we call an UNBALANCED rudder. Image
Image
Jan 12 9 tweets 5 min read
1/x How do the find the right container on board these large containerships? "OK, John, we need the green one" is not going to work.. so instead we use the BRT system (Bay-Row-Tier) Image
Image
2/x The ship will receive a cargo plan, stowage plan or bay-plan with all the positions of the containers. Stowage plans are like blueprints for designing the placement of containers. Without proper stowage plans, ships risk instability, cargo losses, and delays Image