engine room space

Discussion in 'Boat Design' started by milad.naval, Jun 12, 2010.

  1. milad.naval
    Joined: May 2010
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    Location: iran

    milad.naval Junior Member

    Could any one help me,I wanna know How to calculate engine room space for my AHTS intial general arrangement.


    Thanks!
     
  2. PhotoBoatGuy
    Joined: Feb 2004
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    Location: Redmond, WA

    PhotoBoatGuy Rhino fanatic

    Start with the components going into the space. You'll need to visit vendors' websites and get dimensional data on each component (at least the large ones).

    First and foremost, get the engine and reduction gear. Make sure to get complete and accurate information so you can determine how much vertical room to allow for, as well as length and breadth. It's not uncommon to find your reduction gear going out the bottom of your hull or your exhaust sticking up through the deck.

    Exhaust can also be a room-gobbler. Be sure you leave enough room around the exhaust to wrap it with "lagging" (insulation wrapped around the pipes and muffler).

    The rest is just more of the same, depending on what type of boat the engine room is going into. If it's a sailboat, there are fewer items to concern yourself with than if it's a tugboat or container ship.

    When you think you've finalized the space, give it a day or three then go back and make sure you haven't forgotten anything. It's also part of your job to be certain that everything can actually be installed and maintained with ease. The guys in the yard and the engineer on the finished boat will thank you or cuss you, depending on how well you perform this function.

    It's not magic, just good ol fashion research and planning.
     
  3. apex1

    apex1 Guest

    He is talking about a AHTS (anchor handling tug supply ship)

    Concur on the rest.

    Regards
    Richard
     
  4. eric le marin
    Joined: Jun 2010
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    eric le marin naval architect

    I am designing such ships everyday, but I just don't see in which situation someone can ask this question...:confused:

    Designing an AHTS is mainly designing its engineroom (s) !

    So, maybe we can help to design this ship, but then we need more inputs.
     
  5. PhotoBoatGuy
    Joined: Feb 2004
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    PhotoBoatGuy Rhino fanatic



    Jeez. How did I miss that?

    Now it makes sense why he would be asking. I was envisioning all sorts of scenarios and trying to tailor a response that covered them all.

    As Eric says, when you design a tug, you design an engine room and then throw a hull with as much tankage as you get away with around it.

    I second the need for more information before any reasonable answer can be forthcoming.
     
  6. milad.naval
    Joined: May 2010
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    milad.naval Junior Member

    i'm an amateur

    Hi,
    Frist of all,thanks for ur answers.

    I'm desinging an ahts,then i chose a sisiter ship so I could use her Hull.
    After that,I wanted to design her general arrangement,but I don't know how to appropriate spaces!
    I know u have more exprience than me, photoboatguy said "when you design a tug, you design an engine room and then throw a hull with as much tankage as you get away with around it". but i thought the most important place in an ahts is her deck where there should be located heavy anchors and there should have enough space.
    then please help me,i'm confusing!general arrangement designig is really hard!
    The main particular for my ahts:
    Loa:60
    Bm:14.5
    Height:5.5
    Draft:4.8
    total power:2 x 2575 BHP
    Total Power for her sister ship: 2 X caterpillar 3516B ,2575 BHP

    Best regards
    Milad
     
  7. Guest62110524

    Guest62110524 Previous Member

    small ship
    Look if you google Chippy T, Theriot towing I was engineer on her in 1972, ,out of Gt Yarmouth UK on Ecofisk field
    she has similar shp , 2x3000 EMD, she was nice lil ship , worked well, she had enough fuel to steam from Louisiana to UK. It is long way back,for me to remember, but layout on such a small vessel cant be so hard From what I remember, tiller flat where the rudder gear was housed 90,000 lbs push 70000 or so pull, , 12 foot ss 5 blades, 6:1 reduction , mains on 900rpm 200mm ss shafts
    then the engine room., then tanks tanks tanks I am finding it hard to remember but 250000 us gals rings bell
    In those day we fueled from Brown and Root at , 7 cents a gallon:))
    accomadation was huge galley immediately above the fore end E/R , forewards of this , crew cabins, 1x engineers, 4 x crew
    on same deck, then to bridge deck, bridge with caps cab and mates cab,
    I,m just remenising, not much help
    if you search this site with Chippy T, you will find earlier posts by me as (lazeyjack) and a reply by thsi guy whose uncle was there too
    ok so in thinking the EMD,s were about 3m long, 2m gear then 4m behind then 4 in front Roughly , and full beam
    in front of the engines were 2x 6/71 gensets, with overcentre cluthes to drive the hydraulics.. inbetween were the switchboards
    to starboard of mains were all the air and refrigeration compressors Put your lube oil tanks in there too somewhere
     
  8. eric le marin
    Joined: Jun 2010
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    Location: Aalesund

    eric le marin naval architect

    So, you have the hull of an AHTS of 60m ?

    and you want to have the same arrangement, or you want someting else ?

    If you want the same, I'm sure we can find it somewhere.

    If you want to create a new version, I don't recommand you to look at an 1972 tug. preferably look at this: http://www.bourbon-liberty.com/bourbon-liberty-200.html
    The movie will explain everything you need to know, and this ship is certainly what you are looking for : cheap and modern.

    Your two CAT3516B of 1920kW at 1600rpm are cheap and small, that is why I guess you are speaking of a continental offshore vessel (depth <200m)

    Deep water AHTS are the state of the art tugs. Their winches can pull 600T, their bollard pull is above 390T, their speed above 19 knots, they carry one or several WROVs (robots), have an active heave compensated crane of more than 250T, sometimes an A-frame on the stern, etc, and the power installed exceeds 26 MW (36 000BHP)

    For your vessel, I think a DP2 system (redundancy of propulsion and dynamic positionning devices) is enough, but DP3 exists, with separated engines rooms and cable trunks, for more security.
     
  9. Guest62110524

    Guest62110524 Previous Member

    ca va Eric
    you are new here, and knowledgable, welcome, look in forum here in search BOURBON DOLPHIN CAPSIZES, I am sure it will be of interest
     
  10. eric le marin
    Joined: Jun 2010
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    Location: Aalesund

    eric le marin naval architect

    I think this applies to milad naval. Have you looked at Bourbon Liberty 200? I do think it is interesting for that size and price of ships.

    I just wanted, with my previous post, show to milad.naval that an AHTS can be a lot of things.
     
  11. baeckmo
    Joined: Jun 2009
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    Location: Sweden

    baeckmo Hydrodynamics

    Whatever you do, it will always be too crowded in the end.........
     
  12. apex1

    apex1 Guest

    Attached Files:

  13. Alik
    Joined: Jul 2003
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    Location: Thailand

    Alik Senior Member

    Heh, nice pictures You have, Richard! Seems all pleasure boat designers/builders start doing something for special craft or commercial market - isn't it a crisis? :D
     
    1 person likes this.

  14. apex1

    apex1 Guest

    Hehe....:)

    no Albert, it just looks like that, but it is the opposite way round. We did commercial craft in my, now closed down, metal building yard, then went to yachts. The commercial market still is the much tougher battlefield.
     
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