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Exhaust leak, need to swap flange gaskets in smokestacks

Discussion in 'Technical Discussion' started by MV_Schamonchi, Aug 17, 2016.

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  1. MV_Schamonchi, Aug 17, 2016
    #1
    MV_Schamonchi

    MV_Schamonchi New Member

    Joined:
    Aug 17, 2016
    Messages:
    1
    Location:
    Brooklyn, New York, United States
    Greetings,
    I am part of the crew of the MV Schamonchi, a former ferry currently docked in Bushwick, Brooklyn. We have recently discovered that the flange gaskets on both of the smokestacks (coming off of Rolls Royce V12s) have been blown out, and are trying to figure out the proper procedure to install new ones. We see two possible ways to go:

    1) Prop the top part of the smokestack on blocks (the leak is in the middle and the section has two flanges about 16 inches apart, allowing us to remove the middle piece), redo the gaskets, and slide it back in,

    or

    2) Install some anchor points, and use some chain hoists to lift the stack off the flange.

    Stack and flange diameters are about 11" and 16" respectively

    We are pretty new to this. Any input and advice as to the proper procedure would be greatly appreciated.
    • 144’ LOA (129’ Waterline)
    • 250 Ton displacement
    • 90 Gross Tons USCG rating (volume)
    • USCG Documented Recreational Vessel
    • 6,000’ sft interior, 3,000 sft deck
    • Twin Cummins V12 1000hp Turbocharged Diesels
    • Twin 60KW generators

    CE22.jpg
    unnamed.jpg
  2. Capt J, Aug 17, 2016
    #2
    Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    14,434
    Location:
    Fort Lauderdale
    You're going to need a further away picture than that for anyone to advise you. Chances are the top exhaust may be supported well enough to just leave it hanging and just create space with long prybars and wedging something in between the 2 surfaces. I'd put Fuchs joint compound on the gasket (a thin coat on both sides) if it's a dry gasket.

    The best advice I could give you is to hire a professional that deals with Marine Exhaust. Chances are you're also going to have to cut off some of those bolts with an angle grinder/cut off wheel, and the others are simply going to snap off. Plan on replacing all of the bolts.
  3. Capt Ralph, Aug 17, 2016
    #3
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,736
    Location:
    Satsuma, FL
    Oh yea, the bolts, even if they come apart, need to be renewed.
    There is a usual bolt / flange pattern gasket per your flange design.
    A local gasket company can make a proper replacement for you.

    Proper service techs would know this, if not, escort them off and find an other tech that knows these things.
  4. FIQ, Aug 25, 2016
    #4
    FIQ

    FIQ Member

    Joined:
    Feb 19, 2016
    Messages:
    60
    Location:
    Olympia, Wa
    I'm with Cap'n J. After using pry bars to open up the flange, you will find that the accordian style tubing will have collapsed somewhat, thereby keeping it open.
  5. Jorge Lang, Aug 25, 2016
    #5
    Jorge Lang

    Jorge Lang Senior Member

    Joined:
    Nov 17, 2003
    Messages:
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    Location:
    Fort Lauderdale
    While you are at it, check the flex section as well. There is a good chance you may find they are cracked and need replacing as well. As mentioned, replace the fasteners.
  6. 101TUG, Aug 25, 2016
    #6
    101TUG

    101TUG Senior Member

    Joined:
    Jun 24, 2016
    Messages:
    62
    Location:
    ST Barth
    your pictures don't help ...particulary the one from the boat...
    like Capt J told you need picture with bigger angle to see all engine and exhaust

    Hugues