why smoke stacks so fat for diesels of this size?

Discussion in 'Boat Design' started by Squidly-Diddly, Dec 13, 2018.

  1. Squidly-Diddly
    Joined: Sep 2007
    Posts: 1,455
    Likes: 54, Points: 48, Legacy Rep: 304
    Location: SF bay

    Squidly-Diddly Senior Member

  2. Mr Efficiency
    Joined: Oct 2010
    Posts: 7,760
    Likes: 273, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Probably just a carry-over from the steam days, when a smokestack had to have "substance". Or maybe some of these vessels were formerly steam driven. But this timber passenger ferry built in the 1930's was always diesel-powered
    yet the stack is similarly much larger than needed, so could be just for appearances sake.
    Mirana.jpg ,
     
  3. Angélique
    Joined: Feb 2009
    Posts: 3,005
    Likes: 318, Points: 83, Legacy Rep: 1632
    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    Like Mr. E said, on e.g. the 1987 built MS Astor of 15.4 MW total power you can see that the outer size of the stack is mostly meant to be stylish, and that the pipes within need less space...

    Length ~ 578' 3" ~ 176.25 m, Beam ~ 74' 2" ~ 22.60 m, total power ~ 15.4 MW ~ 20,652 HP, propulsion by 2 props powered by 4 Sulzer-Wärtsilä diesels.

    [​IMG]
    (large)

    [​IMG]
    (large)

    [​IMG]
    (large)

    However the total stack size is already much reduced vs early steam power, e.g. the 1858 built SS Great Eastern had 5 boilers to power 4 steam engines for the paddles and an additional engine for the propeller, and so she had 5 large stacks for a total of 6 MW steam power.

    Length ~ 692' ~ 211 m, Beam ~ 82' ~ 25 m, total steam power ~ 6 MW ~ 8,046 HP

    [​IMG]
    (large and very large, be careful not to get a small computer stuck, the latter is 8,419 × 5,123 pixels = 27.11 MB)

    [​IMG]
    (large)
     
    Last edited: Dec 13, 2018
  4. Mr Efficiency
    Joined: Oct 2010
    Posts: 7,760
    Likes: 273, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    The bridge is a bit hard to find on the Great Eastern !
     
  5. Angélique
    Joined: Feb 2009
    Posts: 3,005
    Likes: 318, Points: 83, Legacy Rep: 1632
    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    I guess everyone was at work, shoveling coal and working the sails, plus a lot of maintenance on the engines and boilers etc., so not at ease watching how she goes, hard working like on a sailboat without a bridge, I'm afraid...

    SS Great Eastern 1866 pic
    [​IMG]

    Jackas.s-barque - - Niobe 1930 pic
    [​IMG]
     
    Last edited: Dec 13, 2018
  6. Mr Efficiency
    Joined: Oct 2010
    Posts: 7,760
    Likes: 273, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    It was certainly an example of the "think big" entrepreneurial spirit of the Victorian era.
     
  7. BlueBell
    Joined: May 2017
    Posts: 856
    Likes: 93, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    And the fourth funnel on the TITANIC wasn't even functional!
     
  8. Mr Efficiency
    Joined: Oct 2010
    Posts: 7,760
    Likes: 273, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    If only it had been packed with inflatable life boats that popped out if (when) it sank.
     
  9. Squidly-Diddly
    Joined: Sep 2007
    Posts: 1,455
    Likes: 54, Points: 48, Legacy Rep: 304
    Location: SF bay

    Squidly-Diddly Senior Member

    Attached Files:

    • wtf1.jpg
      wtf1.jpg
      File size:
      113.7 KB
      Views:
      536
  10. Squidly-Diddly
    Joined: Sep 2007
    Posts: 1,455
    Likes: 54, Points: 48, Legacy Rep: 304
    Location: SF bay

    Squidly-Diddly Senior Member

    they should've painted lifeboat silhouettes on the hull


    For when your Felony Conviction makes it illegal to wear real body armor in California.
    Fake ballistic vests become dangerous fashion trend https://www.policeone.com/patrol-issues/articles/121074-Fake-ballistic-vests-become-dangerous-fashion-trend/

    But seriously, if I was designing a pre-radar Coast Guard Cutter I'd want the highest crow's nest possible. Maybe make a tall smokestack part of the structure with tip above the station with 360 degree swivel so the smoke is always pulled cleanly away. Not sure if this would work with strong positive pressure exhaust like diesel. Wind Directional Chimney Cap - Galvanized https://www.famcomfg.com/product/wind-directional-chimney-cap-galvanized/

    This looks like in many conditions the guys in the towers would be smoked out.
    Lattice mast - Wikipedia https://en.wikipedia.org/wiki/Lattice_mast#/media/File:Uss_south_carolina_bb.jpg
     
    Last edited: Dec 14, 2018
  11. Milehog
    Joined: Aug 2006
    Posts: 387
    Likes: 22, Points: 18, Legacy Rep: 215
    Location: NW

    Milehog Clever Quip

    The stacks are likely part of the engine room ventilation system in addition to protecting the hot exhaust pipes.
     
  12. Angélique
    Joined: Feb 2009
    Posts: 3,005
    Likes: 318, Points: 83, Legacy Rep: 1632
    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    The engine room ventilation grates can also be seen around the stack of the MS Astor in post #3, but since the stack underside has a lot of covered area between the ventilation grates, the stack could have been built smaller if this was desired, and still have enough ventilation capacity, I believe.
     
  13. Angélique
    Joined: Feb 2009
    Posts: 3,005
    Likes: 318, Points: 83, Legacy Rep: 1632
    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    Last edited: Dec 17, 2018
  14. Angélique
    Joined: Feb 2009
    Posts: 3,005
    Likes: 318, Points: 83, Legacy Rep: 1632
    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)


  15. HJS
    Joined: Nov 2008
    Posts: 335
    Likes: 44, Points: 28, Legacy Rep: 288
    Location: 59 45 51 N 019 02 15 E

    HJS Member

    One stack contains the owner's cabin on this vessel.
     

    Attached Files:

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.