4 ms·

>big ships are being built with scant regards for hydrodynamics in shallow waters, and it makes a case for some proper research before building more. doesn't s

by trhway 6y ago

>big ships are being built with scant regards for hydrodynamics in shallow waters, and it makes a case for some proper research before building more. doesn't seem so : https://en.wikipedia.org/wiki/Squat_effect https://en.wikipedia.org/wiki/Squat_effect "The third largest cruise ship in the world, MS Oasis of the Seas, used this effect to obtain an extra margin of clearance between the vessel and the Great Belt bridge, Denmark, 1 November 2009, on a voyage from the shipyard in Turku, Finland to Florida, USA.[5] The new cruise liner passed under the bridge at 20 knots (37 km/h) in the shallow channel, giving the ship extra clearance due to a 30 cm squat." The current situation with EverGiven seems to be more like a ship piloting error - as normally they are taught about the Bernoulli based bank/squat effects when piloting near ground or near other ships moving in parallel direction.

banana_giraffe 6y ago
Doesn't the Suez Canal have specialized pilots that take over going through the canal? If it pilot error, makes me wonder if it's more a case of not knowing something about the class of ship somehow.
- CalChris 6y ago
  Yes and two were on board. https://gcaptain.com/ever-given-grounding-the-latest-from-the-ship-manager/ https://gcaptain.com/ever-given-grounding-the-latest-from-th...
  - Animats 6y ago
    “Arrangements are also being made for high-capacity pumps to reduce the water levels in the forward void space of the vessel and the bow thruster room.” Now it comes out that they're taking water. Things just got more complicated. At a minimum, it will be necessary to dig the bow out and do some patching. How big a deal this is remains to be seen. If they're lucky, it's just the connections for the bow thruster. If the hull has to be patched, it's a bigger job. Patching is quite possible, even for big holes. That's just a temporary fix. The ship may not be seaworthy for long trips. That monster ship will probably have to be towed to a nearby container port, probably Port Said, and the containers unloaded. Then probably across the Med to a dry dock that's big enough, probably one in Greece, for permanent repairs. But by then it will be out of the traffic lane and a concern only to the owners.
    - trhway 6y ago
      >Now it comes out that they're taking water. it is natural given that the ship did hit the protective boulders before getting onto the sand bank. I was wondering when it would come out.
    - elemeno 6y ago
      From another article on the FT it sounds like they’re talking about ballast, not that it’s taking on water. - “ Alongside specialists dredgers that are working to remove sand and soil from around the vessel, salvage experts Smit are looking to bring in high-powered pumping equipment to remove ballast water from the front and back of the ship, BSM said.”
      - trhway 6y ago
        And in another news they are worried about how to avoid capsizing of such a top heavy ship.
cromka 6y ago
Just to add a bit more to MS Oasis of the Seas passing under Great Belt bridge: "Approaching the bridge at 23 knots (43 km/h; 26 mph), the ship passed under it with less than 60 centimetres (2 ft) of clearance." EDIT: found a video https://www.youtube.com/watch?v=RYf8F9-jULo https://www.youtube.com/watch?v=RYf8F9-jULo Mind. Blown.

by trhway 6y ago

banana_giraffe 6y ago

Doesn't the Suez Canal have specialized pilots that take over going through the canal? If it pilot error, makes me wonder if it's more a case of not knowing something about the class of ship somehow.

CalChris 6y ago
Yes and two were on board. https://gcaptain.com/ever-given-grounding-the-latest-from-the-ship-manager/ https://gcaptain.com/ever-given-grounding-the-latest-from-th...
- Animats 6y ago
  “Arrangements are also being made for high-capacity pumps to reduce the water levels in the forward void space of the vessel and the bow thruster room.” Now it comes out that they're taking water. Things just got more complicated. At a minimum, it will be necessary to dig the bow out and do some patching. How big a deal this is remains to be seen. If they're lucky, it's just the connections for the bow thruster. If the hull has to be patched, it's a bigger job. Patching is quite possible, even for big holes. That's just a temporary fix. The ship may not be seaworthy for long trips. That monster ship will probably have to be towed to a nearby container port, probably Port Said, and the containers unloaded. Then probably across the Med to a dry dock that's big enough, probably one in Greece, for permanent repairs. But by then it will be out of the traffic lane and a concern only to the owners.
  - trhway 6y ago
    >Now it comes out that they're taking water. it is natural given that the ship did hit the protective boulders before getting onto the sand bank. I was wondering when it would come out.
  - elemeno 6y ago
    From another article on the FT it sounds like they’re talking about ballast, not that it’s taking on water. - “ Alongside specialists dredgers that are working to remove sand and soil from around the vessel, salvage experts Smit are looking to bring in high-powered pumping equipment to remove ballast water from the front and back of the ship, BSM said.”
    - trhway 6y ago
      And in another news they are worried about how to avoid capsizing of such a top heavy ship.

cromka 6y ago

Just to add a bit more to MS Oasis of the Seas passing under Great Belt bridge: "Approaching the bridge at 23 knots (43 km/h; 26 mph), the ship passed under it with less than 60 centimetres (2 ft) of clearance." EDIT: found a video https://www.youtube.com/watch?v=RYf8F9-jULo https://www.youtube.com/watch?v=RYf8F9-jULo Mind. Blown.