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  1. KevinK2

    Baltimore Bridge collapse after ship collision

    Video of activity after precision-cutting the truss off the bow. You can see why they left part of the structure standing, as it was leaning against some hazardous containers. https://www.youtube.com/watch?v=_n7_-34qeOk Kevin Kelleher, MEPE (retired)
  2. KevinK2

    Baltimore Bridge collapse after ship collision

    Apparently the crew is represented by a Singapore trade union. https://www.maritimetrades.org/singapore-maritime-union-officials-brief-mtd-board-on-dali-crew/ Kevin Kelleher, MEPE (retired)
  3. KevinK2

    Baltimore Bridge collapse after ship collision

    That's a great imaging compilation. I'm not sure if the torch cutting image is near the Dali? When I see those stratigic demolation videos, I bet they first did "explicit" FEA predictions* of how the truss would fall apart, rolling off the side. They knew exactly how to alter the cutting strip...
  4. KevinK2

    Baltimore Bridge collapse after ship collision

    Between that concrete mass, and the residual truss structure still resting both against and on the bow, the task of safely clearing the ship could take longer than assumed. It appears the main reason for drive loss was a fault related to the cooling water pump for the mega-diesel engine. Could...
  5. KevinK2

    Baltimore Bridge collapse after ship collision

    Wouldn't the noise from each cutting charge be directly related to the thickness and width of the metal cut? May explain a noisier event than expected. Kevin Kelleher, P.E. (retired) Internal Mechanical Eng'g Consultant DuPont ESD Specialists
  6. KevinK2

    Baltimore Bridge collapse after ship collision

    Latest Update: Ready To Blow Key Bridge Off MV Dali Baltimore On saturday night, charges will be detonated to assist removal of the remaining bridge truss on the port side of the bow. Video shows installation of linear charge strips, and use of huge double shear cutting claw. Link Kevin...
  7. KevinK2

    Newly Constructed Gym Has Roof Collapse in New Mexico

    Those 2 "bolts" act more like pins spaced wider than the cord. The video shows the top cord being slid sideways into the pocket above those pins, then being dropped down between them. The installers appear to be working at both cord-pocket connections, but it's not clear what they did to secure...
  8. KevinK2

    Baltimore Bridge collapse after ship collision

    Precision explosives will soon be used to safely remove the stressed bridge structure straddling the Dali bow: graphical-representation-precision-cutting-charges-will-used-key-bridge-section Kevin Kelleher, P.E. (retired) Internal Mechanical Eng'g Consultant DuPont ESD Specialists
  9. KevinK2

    Newly Constructed Gym Has Roof Collapse in New Mexico

    It does seem like the top cord was initially too long to fit into the original pockets, based on the left pocket apparently being manually deepened. This allowed the right end to swing inboard of the protruding, original pocket/pilaster. It may appear that opening was also widened, perhaps for...
  10. KevinK2

    Newly Constructed Gym Has Roof Collapse in New Mexico

    https://www.facebook.com/watch/?v=2900271060136528 Is there a real time video available? May provide more details of what appears to be steel lined openings for the pilasters, and how the workers were using fasteners? to secure the end of the truss. Kevin Kelleher, P.E. (retired) Internal...
  11. KevinK2

    Newly Constructed Gym Has Roof Collapse in New Mexico

    Based on the assembly video, it's not clear if the bearing engagement on each protruding pilaster was equal, and this may have influenced the failure mode. After engaging the left support, the free end of the truss sweeps just inboard of the other, protruding pilaster. The truss must then be...
  12. KevinK2

    Baltimore Bridge collapse after ship collision

    ~Latest Update Video https://www.youtube.com/watch?v=Z2rToCpwAhc The massive truss section straddling the front of the Dali, had to be cut in two before removal. Being in a stressed condition required dedicatied cutting methods. I read that "precission cutting" was used, and "simultanious cuts"...
  13. KevinK2

    Baltimore Bridge collapse after ship collision

    Recent Video Update, taken from the water: https://www.youtube.com/watch?v=Pt9lvf4FnZE Kevin Kelleher, P.E. (retired) Internal Mechanical Eng'g Consultant DuPont ESD Specialists
  14. KevinK2

    Baltimore Bridge collapse after ship collision

    I have looked for that data for a while now, with no success. But based on the various data plots, it looks like 3 points define the departure from a strait path and final contact with the bridge. Graphically, the first angle is about 5-6 degrees, and the final pair ~12 degrees, as if the ship...
  15. KevinK2

    Baltimore Bridge collapse after ship collision

    This video opens with a view of the reinforced concrete support that the Dali hit. Soon the focus is on the part of the upper hull that was removed by the collision with the support. This shark-bite from the hull went below the deck, but not below the waterline. Don't know if the hull was opened...
  16. KevinK2

    Baltimore Bridge collapse after ship collision

    By coincidence new 80ft dolphins are currently being installed nearby for Delaware Memorial Bridge over the Delaware River. The bridge is massive, and MV Ships travel under it to major ports in Philadelphia. Dolphin design details...
  17. KevinK2

    Baltimore Bridge collapse after ship collision

    Momentum is a vector quantity M = m * V , caps imply vector, and m = huge So the bow thruster would work against a resistive, momentum based torque. That's why their use is only effective when V is near zero, as in docking. Kevin Kelleher, P.E. (retired) Internal Mechanical Eng'g Consultant...
  18. KevinK2

    Baltimore Bridge collapse after ship collision

    -> I haven't seen any speculation concerning the bow thruster. Based on my limited research, a thruster is sized to maneuver the ship at low-idle speeds, as during docking proceedures, not to change the direction of the ship underway. When the drive was lost, limited linearized tracking data...
  19. KevinK2

    Baltimore Bridge collapse after ship collision

    Great input. alleged MV Dali drives/generators: Dali is propelled by a single low-speed two-stroke crosshead diesel engine coupled to a fixed-pitch propeller. Her main engine, a 9-cylinder MAN-B&W 9S90ME-C9.2[9] unit manufactured by Hyundai Heavy Industries under license, is rated 41,480 kW...
  20. KevinK2

    Baltimore Bridge collapse after ship collision

    charliealphabravo: "You are guessing. Saying, rather, that we don't know does not compromise an investigation of cause." It's not guessing if you have paid specialists to investiage for any act of sabotage, tax payer funded FBI: https://www.youtube.com/watch?v=Ws7pOHGV3dQ Kevin Kelleher, P.E...

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