Bart 🌊⚓️ Profile picture
Senior Maritime Pilot | Master Mariner | Master's degree Nautical Science | Forensic Medicine | Glassblower |
Apr 15 24 tweets 8 min read
1/x I notice many people confusing "transit passage" and "innocent passage" regarding the Strait of Hormuz. There also appears to be uncertainty about what qualifies as an "international strait." Let's clarify the differences. 🧵 Image 2/x Those two terms stem from UNCLOS 1958 and UNCLOS 1982. If you want a history of how UNCLOS came to be, check the link below:
Apr 9 24 tweets 8 min read
1/x I guess I have to deal with the Bosphorus Strait and the Dardanelles and their status as well, so here goes: They're essential strategic waterways that links the Black Sea with the world’s oceans. The Bosphorus also separates Asian Türkiye or Anatolia from European Türkiye. Image 2/x After WW1, the Armistice of Mudros (October 30, 1918 ended hostilities between Ottoman Turkey and the Allies. The Mudros document's 25 articles gave the Allied Powers the right to use the Dardanelles and Istanbul Straits freely and occupy fortifications on their shores. Image
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Apr 9 20 tweets 7 min read
1/x The comparison between the Suez Canal and the Strait of Hormuz is crooked, as the Strait of Hormuz is defined in UNCLOS82 as an international strait with the right of "transit passage" (not "innocent passage", that's UNCLOS58). But what about Suez? A small🧵 Image 2/x The big difference is, of course, that the Canal is man-made and not a natural strait. It is also located entirely within Egyptian territory. It is fully subject to Egyptian sovereignty and jurisdiction, just like any other part of Egyptian land or inland waters. Image
Apr 7 24 tweets 6 min read
1/x Today a small explanation about the "Worldscale Rate" (WS) as (oil) tankers have been in the news a lot the last month. A small 🧵 Image 2/x In the tanker market (crude oil, refined products, and other liquid bulk), voyage charters (also called spot charters) dominate. On a voyage charter, vessels are hired to carry cargo from a load port(s) to a discharge port(s) at an agreed freight rate.
Apr 4 25 tweets 6 min read
1/x Imagine an oil tanker runs aground near your shores and the resultant oil spill creates around $22million in damages (in 1967) but because of a law, dating back to 1851, the ship owner liability is limited to $50. Image 2/x This was the case with the Torrey Canyon where the US Limitation of Liability Act of 1851 said"...the owner's liability shall not "exceed the amount or value of the interest of such owner in such vessel after the incident, and her freight then pending." Image
Apr 2 19 tweets 7 min read
1/x In June 1967, during the Six-Day War between Israel and Egypt, Egyptian forces blocked the Suez Canal by sinking ships, laying mines, and filling it with debris to prevent Israeli use. A northbound convoy of 15 cargo vessels became trapped. Image 2/x Fourteen anchored in the wide Great Bitter Lake, while the American SS Observer was isolated in Lake Timsah. These ships from eight nations would remain stranded for eight years, coated in desert sand and known as the Yellow Fleet. Image
Apr 2 7 tweets 3 min read
1/x I'm getting asked how I can see that the ship is supposed to be at anchor. The anchor chain is not immediately visible, but you can still see the ship is at anchor. How so? It's something called "Lights and Shapes" from the COLREG. A small 🧵about shapes 2/x Back to our vessel. On the foremast you can see a black ball hanging. This is the ball mentioned in the COLREG - PART C-LIGHTS AND SHAPES - Rule 30 Image
Mar 31 20 tweets 7 min read
1/x So a lot of people are talking about the "shipping route" in the Strait of Hormuz. What exactly are those shipping routes? On the charts, you can see a magenta-coloured area. This is a TSS or traffic separation scheme. A small 🧵 Image 2/x What is a TSS, and where do we find them? First, it should be said that TSS are only used in high-traffic areas. Elsewhere, the navigator is free to plan his route, taking into account fuel, time, weather, obstacles, hazards, etc.
Mar 30 15 tweets 7 min read
1/x I have updated and translated an older thread on a fun little wartime project called: "PROJECT HABAKKUK." By late 1942, U-boats were causing significant damage to Allied merchant shipping in the North Atlantic. Image 2/x The allies were in a panic and sought desperate measures to protect those convoys. In desperation, Churchill conceived one far-fetched remedy, taking massive icebergs and smoothing them over to make landing strips in the North Atlantic to provide air cover for convoys. Image
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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
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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
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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
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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