Ships built in two halves and welded together

Discussion in 'History' started by Billy Q, May 23, 2016.

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  1. Are they safe?

    The trouble started in WW2 with Liberty ships and appears to have progressed to recent times.
    Welding techniques will have improved since 1940.
    We now have Degrees in Welding Technology with Cranfield University offering a Masters Degree.

    But are ships built in two halves and welded together totally seaworthy in all weathers?
  2. Trainer

    Trainer War Hero Book Reviewer

    During WW1 it was not uncommon to commission a class of warships from various yards. There could be a surprising variation in the end product from yard to yard. An example of this was the F, or Tribal Class Destroyer, whose 5 vessels were built in 5 different yards and had widely ranging specs. All 5 of the Class were different lengths and varied from 72 up to about 85 metres.

    During 1916, a Tribal Class , HMS ZULU, was damaged in the rear by a mine. HMS NUBIAN, another of the same class, was damaged by a Torpedo near the forecastle.

    Chatham Dockyard cut both ships in half and joined the front of ZULU to the rear of NUBIAN, creating HMS ZUBIAN, which served until 1919. Not the sleekest lines ever on a Pusser's Grey, but it worked.
  3. And don't forget the building of - I think - the nuclear submarine HMS Trafalgar. The hull sections were built separately and then joined up - but someone managed to get one section upside down. The Daily Telegraph had a cartoon showing a submarine with a periscope sticking out of the bottom......
  4. janner

    janner War Hero Book Reviewer

    Was that Sumo's bottom? :oops:
    • Like Like x 1
  5. I couldn't possibly say, but if it was I bet it hurt.
  6. janner

    janner War Hero Book Reviewer

    In more recent times...from HMS Ulster's web page.

    Early in 1966 she damaged her stern, so the complete stern was cut from HMS Urchin and fitted to Ulster in Devonport Dockyard in June
  7. HMS Porcupine--One that wasn't re-joined

    8th Deployed with HM Destroyers ANTELOPE. VANOC, BOREAS and Polish ORP BLYSKAWICA as

    escort for troopship ss OTRANTO, HM Depot Ship MAIDSTONE and ss TEGELBUG during

    passage from Gibraltar to Oran.

    Under submarine attack and hit by torpedoed by U602, 70 miles NNE in position 35-55N 40.00E.

    Sustained major structural damage with flooding.

    Casualties included seven killed or missing and three wounded.

    10th Transferred personnel not required for damage control to HMS VANOC.

    Taken in tow by HM Frigate EXE and topweight jettisoned in an attempt to reduce increasing list.

    Tow transferred to French tug for remainder of passage to Arzeu, Algeria.

    Remained at Arzeu.

    1 9 4 3

    January Prepared for tow to Oran



    March Passage under tow to Oran for survey.

    28th Docked at Oran.

    May After survey taken in hand for repair to allow passage to Gibraltar in two parts

    to Two Sections taken in tow by tugs and took passage to UK as part of separate convoys

    June SL129 and AX? to SW Approaches.

    Individual escort was provided for final passage in English Channel to Portsmouth.

    N o t e

    The two sections of this ship ware used for accommodation of crews of Landing Craft in Stokes Bay at Portsmouth and were identified as PORK (Forward Section) and PINE (After Section). The Sections were placed on the Disposal List in 1946 and sold for breaking-up. The Forward Section being towed to Plymouth and the After Section to Southampton.
  8. Billy, you REALLY need to find out about modern shipbuilding.

    Research for instance how the Type 45s were built......

    Also the as yet un-sea trialled carriers!
  9. The RC section was upside down, was a couple of mm thicker at the top instead of the bottom.
    It was Triumph by the way.
    The Yanks smashed a Boat newly out of refit into an underwater sea mount, rather than scrap it they took the front off a boat about to go into refit and scrapped that. USS San Francisco / Honolulu



    • Informative Informative x 1
  10. RRS discovery (post lop in half and extension of lab spaces and stick back together) survived a 29m wave and a variety of other really really shit weather. Suggests that they manage just fine, the crew and scientists seemed somewhat mor breakable than the ship in the end. Although some windows smashed
  11. Triumph? Isn't that what I said? This bloody predictive text has a lot to answer for!
  12. It's true. I've tried and read conflicting reports. Thank you for the type 45 information. Have they stood the test of seriously heavy weather? Were they built in two halves and welded together mid-ships?
  13. Most modern ships and submarines are now built with what is called modular construction. Pusser has been doing it for years.

    You can't compare ships thrown together in a couple of weeks to meet wartime needs (with a designed low working life expectancy) to modern ship construction. That's a bit like comparing a Hawker Hurricane with a Typhoon (todays one, not the WW2 one!)
    • Like Like x 1
  14. Traf
  15. Trainer

    Trainer War Hero Book Reviewer

    If one uses the Aircraft analogy... During WW2, I'm led to believe Spitfires were very highly engineered, needing servicing only after a long period of time. Somebody did a time and motion study and worked out that the aircraft, on average, only survived for 200 hours before being shot down. Hence the aircraft was over-engineered. By downgrading quality, they could make them faster and in greater numbers, which is what was wanted.

    The downside now being that the BBMF aircraft spend large amounts of time in Depth Support being spannered.

    Analagous to the Liberty ships concept I suppose.

    Remembering that until relatively recently, many aircraft were craft built (VC-10 for example) and therefore having individual flying characteristics. 'Vulcan 607', about the Black Buck Raid, mentions this.
    • Like Like x 2
  16. No mate the Periscope would have been anther part of my anatomy:D
  17. I think you will find the new carriers are modular design, where ever possible
    Boats the same, build bits in different parts of Barrow, then sling them in just before next butt weld
  18. Topstop - re post #14. ..........OK, it's a fair cop. But I reckon it was your fault for reading my post wrongly in the first place.
    (I don't see why I can't use this as an excuse - Mrs W does it all the time, and I'm always wrong )

    Back on thread, the crabs had some of their C130s cut in two and new sections inserted to create a stretched version. Don't know if they used welding or maskers, though.
  19. Trainer

    Trainer War Hero Book Reviewer

    So a Class of Submarine famed for it's small Periscope then? :rolleyes:
  20. Tin

    Tin Midshipman

    The Norwegian bulk carrier MV Sygna, as well as ending her life in two distinct halves in 1974, began life that way too. The location of the shipyard in which it was built is on a narrow river, and the ship design was too long to negotiate the bends in the river enter the sea, and so it was constructed in two halves and joined together further down the river at the mouth to the sea. Not only is this an unusual parallel with how the ship met its end, but it was also built, not in Norway, but in a river suburb of Newcastle in England, about 5km from the city centre, and it ended its service in a similar proximity from another Newcastle, in Australia.

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