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🧵
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.
3/x So what is a P&I club? They started in 19th-century UK. Shipowners found regular commercial insurers too pricey, and those policies often ignored cargo damage or crew injuries from normal ship use. Owners were left paying huge claims out-of-pocket.
4/x Solution? They formed "hull clubs", mutual groups where shipowners insured each other. Everyone chipped in fees, shared the risks, and ditched expensive middlemen (commercial insurers). This mutual pooling cut costs and covered the gaps.
5/x Over time (as shipping grew, laws changed, liabilities exploded), these became today's P&I clubs. The core idea remained unchanged: shipowners pool risks together in non-profit mutuals. Members (shipowners) pay an annual "call", basically a premium/contribution.
6/x Calls are due February 20. Why that odd date? Old tradition from the Baltic Sea trade: February 20 was roughly when winter ice melted, ports reopened, and sailing ships resumed voyages. So it became the "start" of the maritime insurance year.
7/x A P&I club is run by (and for) the shipowners themselves, true mutual insurance. Strictly non-profit: no shareholders taking profits. If claims in a year exceed collected calls, members pay extra (supplementary call). If claims are low, discounts/returns are possible.
8/x What do P&I clubs cover? Third-party liabilities not in standard hull insurance: crew injury/death, passenger claims, cargo damage/loss, collision damage to other ships, oil spills/pollution cleanup, wreck removal, fines for customs violations, etc. Big stuff!
9/x Entry isn't automatic. Ships must be seaworthy, well-maintained, and classed by a society (like Lloyd's Register). Crews need proper training/certificates. Clubs often send surveyors to inspect vessels & operations before accepting (or to monitor existing members).
10/x Soon, single claims got too massive for one club (huge pollution disasters). So clubs pooled again: they formed the International Group (IG) of P&I Clubs, the 12 big ones covering +-90% of world tonnage.
12/x In the IG pool: Each club keeps the first $10M USD of any claim (after member's deductible). Anything from $10M to $100M is shared across all 12 clubs ($90M + $10M pool layer). Proportional to each club's tonnage share.
13/x Excess of US $30 million, the Pool is reinsured by the Group captive reinsurance vehicle, Hydra Insurance Company Limited. Hydra is a Bermuda-incorporated Segregated Accounts company in which each of the 12 Group Clubs has its own segregated account (or “cell”).
14/x This segregated cell fences assets and liabilities from those of the company or any of the other Club cells. Hydra covers the upper pool slice ($30M–$100M).
15/x Above $100M? It goes into a tall "tower" of commercial reinsurance: the Group Excess of Loss (GXL) program. For 2026/27, this provides up to $2.25B in three layers (Layer 1: $650M + $100M; Layer 2: $750M + $750M; Layer 3: $850M + $1.5B), bought globally.
16/x Beyond the GXL tower? There's a final "collective overspill" layer ($1B + the $2.35B ceiling) where clubs share any extreme shortfall. The whole setup spreads mega-risks, so no single owner or club goes bankrupt from one bad claim.
17/x Standard P&I policies do not cover war risks, including war, terrorism, piracy, strikes, and similar events. These risks are covered separately through war risk policies or add-ons, which are typically inexpensive, though premiums can soar in high-risk areas.
18/x War risk cover is often placed through specialist markets (e.g., London) or IG clubs' fixed-premium arms. It's reinsured heavily in a similar layered tower as the main P&I program (pool -> Hydra -> GXL excess layers).
19/x Why separate? War events are unpredictable & potentially massive (e.g., mine strikes, missile hits, blockades). Pooling them with everyday P&I liabilities could bankrupt clubs if a major conflict hits. So war risks are "non-poolable" or specially reinsured.
20/x Clubs issued 72-hour cancellation notices (standard clause) starting March 1–2. Effective midnight GMT March 5, 2026: War risk cover auto-terminated for Iranian waters, Persian/Arabian Gulf, Gulf of Oman, and adjacent areas.
21/x They are now cancelling the primary war risks coverage, specifically the first layer, purchased separately through specialist markets (often based in London_ or via club fixed-premium options. The coverage activates from the first dollar, up to the vessel value or $500M
22/x There is a secondary (excess) war risk coverage that attaches to the first layer (which is NOT cancelled), but if the 1st layer is cancelled, that means that the shipowners have a huge deductible for the value of the 1st layer.
23/x Anyway.. It's all very complicated, but I hope this gives you an idea of what it means when we talk about P&I clubs and War Risk Coverage
24/x And I'm fully aware that Hydra Insurance Company Limited sounds like something from a James Bond movie and that probably somewhere, there's an inactive volcano with a missile inside of it, ready to launch, and destroy the world
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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.
3/x The first documented mention came on 21 February 1688 in The London Gazette: an ad offering a guinea reward for info on five stolen watches, directing people to "Mr. Edward Loyd’s Coffee House in Tower Street."
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.
3/x One set, the AFRA scale (developed by Royal Dutch Shell in 1954), is a breakdown of tankers by capacity range that is used to average world freight rates. It has added upper ranges as tanker sizes increased over the past five decades.
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
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.
3/x Originally, the ship was "only" 377m (1237ft) long, but after construction problems and a resale to a new owner, OOCL, they decided to make the ship even longer by inserting nearly 81m extra.
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.
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.
3/x How did we get here? Before the 1960s there was no immediate need for mass transport of vehicles. Cars were lashed to open decks on general cargo or passenger vessels, using cranes for loading and unloading.
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.
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?
3/x How many compartments do we divide a ship into? These are questions that need answers right at the start of the design process, usually in the concept design phase.
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🧵
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
3/x July 25, 1944, she departed from Hog Island, Philadelphia, loaded with approximately 7,000 tons of munitions destined for Europe. It joined convoy HX-301, sailing from the Delaware River across the Atlantic to the UK, with plans to proceed to Cherbourg, France