question about the drain

Discussion in 'Multihulls' started by tz3dcom, Sep 19, 2012.

  1. tz3dcom
    Joined: Jul 2006
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    Location: China

    tz3dcom 3D

    I am working on a interior dwg and have a question about the drain need helps.

    Pls see attached the dwg , does anyone think it's no problem to pour the sink water( head and galley) direct to the overboard rather than into the waste water tank ?

    if it is ok that would be great as we want to make the head as clear and simple as possible .

    Thanks for any advice .
     

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  2. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    That is called 'grey water'.
    Environmentalists may be opposed to it (they always are), but I would feed it straight to a through hull slightly above the waterline. As far as I know this is common practice.
     
  3. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    For some type of boats, for example, the passenger ships, this issue is not an option, it is mandatory to have a gray water tank, with means to disembark in port waters. In some ports, or all ports, is prohibited pouring gray water into the sea. It depends, I guess, on the rules you want to fulfill your boat or the requirements of local authorities. Although I do not know all the rules, I'm afraid you must place a gray water tank. (I can be wrong).
     
  4. Frosty

    Frosty Previous Member

    Never heard of grey water regs, Bloody hope not I havnt got black water tanks yet.
     
  5. Bglad
    Joined: May 2010
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    Location: Jacksonville, Florida

    Bglad Senior Member

    It is common here in the USA for gray water to go straight overboard.
     
  6. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    Inside ports, docks, etc.. have to meet certain standards, not necessary in open seas. The first thing that occurs to me to mention, without thinking further, is in MARPOL. I guess there are countries who care more than others, for the quality of its coasts and beaches and therefore require compliance with some higher standards.
    There are international standards against various types of pollution and, I suppose, each country is free to accept or not. We probably talked about it.
    If the boat in question is recreational and must operate in Europe, it is quite possible that he needs to have a gray water tank. If it is a passenger vessel, must surely have it.
    I can not guarantee anything. I can only repeat that we must analyze the rules you need to follow the boat. If no such rules, as it is clear, does not need the tank.
    Although I have not heard of something, I can not doubt that it exists. I'll try to be humble and research on the subject.
     
  7. CDK
    Joined: Aug 2007
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    CDK retired engineer

    To the best of my knowledge, MARPOL concerns itself with ships and real pollution. And it still is a paper tiger because they can only advise, not enforce.

    I know there are European countries where you are no longer welcome with a below the waterline toilet, but as long as the mediterranean countries still dump untreated sewage in the sea I don't worry about water from the sink.
     
  8. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    As far as I know, no rule or regulation is binding on any country that has not signed compliance. As far as I know, MARPOL is not a paper tiger, but a regulation that certain countries have pledged to meet, countries, therefore, binding on all ships that are built in the same. As far as I know, there are rules, such as the Coast Guard, which require vessels plying U.S. waters, although these boats are built or flagged in other countries.
    As far as I know, the Spanish Administration requires all passenger vessels to carry gray water tanks, whose size is determined by the passage and the number of days at sea. As far as I know, this regulation does not apply to recreational craft but, sure (¿¿¿) that some rules should apply to them. As far as I know, a boat that is "caught" discharging her gray waters into waters from a port, or near the coast, can be fined for it. Not to mention the Croatian coast of the Greek coast or the Baltic Sea.
    If what I know is not right, I will not have any inconvenience in changing my opinion.
     
  9. tz3dcom
    Joined: Jul 2006
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    tz3dcom 3D

    In fact the boat with grey water tanks as shower grey water need it . Just to be safe though the sink grey water should be go into the tanks .but it 's more complex to put the
    water pipe in the head .

    Does anyone know if there has some product cat with grey water direct to the overboard ? and no problem for MARPOL .
     
  10. Submarine Tom

    Submarine Tom Previous Member

    If you are cognizant (careful) about what you dump down the drain, you're fine.
     
  11. Milehog
    Joined: Aug 2006
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    Milehog Clever Quip

    This has me wondering which so called 'green' dish soaps actually work. Or which soaps that do a good job aren't too toxic.
     
  12. Submarine Tom

    Submarine Tom Previous Member

    The ones without phosphates, use sparingly.

    Baking soda can help, as can vinegar, use sparingly.
     
  13. 2far2drive
    Joined: Nov 2011
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    Location: Houston, TX

    2far2drive Senior Member

    As far as I know, most boats here in the USA on coastal ocean waters are not required to have a greywater tank. However, a large schooner I was working on did plumb all water into a grey/blackwater tank but it was my understanding that this was not necessary. ??

    When I got a vessel ready for coastguard inspection they only wanted to see a Y valve on the head and that it was "secured" in the "into tank" position. I used a plastic ziptie and they were satisfied. On the schooner, we had to install a padlock.

    As for the "environmentalists" comment, you clearly have done zero reading or research as to the harmful effects of soap to the environment. In the usa while camping on federal and state lands, you are strongly warned NOT to wash any dishes or clothes near a watersource and to collect all used (grey) water.

    I used biodegradable campsoaps when I was camping for months on end in the mountains and while living aboard and delivering boats. If you must pump it overboard, use the right soaps! I have no issue with pumping overboard in an area of ocean but when inland or coastal, the right soap just makes me feel better.
     
  14. Frosty

    Frosty Previous Member

    Marine environmentalists --Duh

    Ok my marina will allow anything to be dumped in the sea water. The boats still use strong antifouling . One supplier has his own fabricated in Malaysia to the old Jotun Sea queen specifications . Some add there own TBT at 3% as do I --every --one --does --this .

    Marine life is abnormal, your propeller will look like a foot ball in just 3 months . Fish are abundant . Fishermen are constantly being chased out of the marine , they say there is no fish outside they are all inside ---

    To top this just 100yds away isd a international ferry terminal. There will be at a guess 100 150 foot ferries that fuel up from barges at night . Some nights I have to close hatches and windows as the smell of diesel spillage is too strong on the nose.

    And the marine life love it. Im not saying go ahead and dump what you like but evidence is evidence and not statistical realms of paper that people in small rooms in dark corridors of government building come up with answers they were paid to get.


    This is the answer we want --prove it.
     

  15. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    MARPOL generally concerns itself with vessels over 400GTs.
     
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