Have you considered installing sumps instead of a tank? Gray water
tanks, because they contain food particles, cooking grease, soap scum
body oils and a whole bunch of other thing are MUCH harder to maintain
and keep odor-free than black water tanks. Sumps, otoh, can easily be
flushed and cleaned...they'd solve your problem and be so much easier to
maintain than a tank.
Otoh, maybe what you're thinking IS a sump...how large a gray water tank
are you envisioning?
Peggie
Steve Lusardi wrote:
Peggie,
Thank you for your reply. No, I have no intention of combining black and
grey water. The application is a sailboat. Sailboats live on their ear. All
drains are effectively below the waterline. In that light, draining through
conventional water traps into a large grey water tank with one through hull
and a single pump and check valve allow facility useage under all points of
sail in all weather conditions. To me, this is highly desireable and is a
better solution than shutting all outboard drains in heavy weather. This
solution is not available to all designs. There must be adequate headroom
and bilge depth to facilitate it.
Steve
"Peggie Hall" wrote in message
.. .
Steve Lusardi wrote:
Does anyone know what the mimimum slope of this drain can be that will
not cause clogging? I really do not want to use a second grey water tank
in the forward end which will cause loss of space and another through
hull fitting. It is preferable to use one large tank for the whole boat.
Why are you installing a gray water tank? Gray water (galley, bath and
shower water) can go directly overboard in all coastal waters and, except
for only 2 or 3 places, on all inland waterways too.
If you're mistakenly referring to toilet waste (black water) as gray
water, holding tanks should be within about 6' of the toilet--'cuz that's
as far as bowl contents will move in the amount of time anyone will spend
flushing. So if you want to avoid leaving waste sitting the line, a single
large tank to serve two toilets at opposite ends of a larger boat isn't a
good solution.
If you're thinking of combining black water and gray water in the same
tank, CG regulations won't allow it. Gray water and black water plumbing
and tanks must be completely separate...can't even share a common vent.
--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/books...ku=90&cat=1304
--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/books...ku=90&cat=1304