[Public-List] Holding tank question

[George Dinwiddie]

Hi, Glenn,

On 3/3/13 8:41 PM, Glennb wrote:
> Hi all,
>
> I am replacing my old chain locker holding tank with a new tank and
> plumbing. The new tank will be located under the port berth in the
> focsle.
>
> There is an existing shut off valve  in the old discharge line that
> isolates the old tank from the y valve and overboard valve both
> located at the head.  Is there some U S requirement to have a shut
> off valve mid way between the tank and the overboard discharge point?
> If so, where should I relocate the valve with my new plumbing
> routing?

As far as I know, the US just requires that you can lock the overboard 
valve. I use a tiewrap screwed to the bulkhead that holds the handle 
shut. (http://bit.ly/ZeUEyF kind of tiewrap)

>
> Also, WITW (where in the world) should I route the breather tube
> outlet from the new tank.  I sure  dont want to live with the
> fumes/oder of the breather tube outlet in the boat, or outboard
> forward along the cabin top.

I routed mine to the bow. If you use two breather vents, one on each 
side of the bow, you'll get air flowing through due to the difference in 
air pressure on the two sides. This help keep the tank aerobic rather 
than anaerobic. See 
http://alberg30.org/maintenance/Head/RaritanNewer/3-venting.html

  - George

-- 
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   When I remember bygone days                         George Dinwiddie
   I think how evening follows morn;            gdinwiddie at alberg30.org
   So many I loved were not yet dead,           http://www.Alberg30.org
   So many I love were not yet born.                          also see:
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