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From: Owen H. Morgan (no email)
Date: Wed Dec 12 2001 - 17:58:03 EST
Howdy!
Doug Barnard wrote (> ):
> Doesn't the wee-wee corrode the S/S?
Not if the tank is proper high grade S/S which is the only metal that should be used for any tank on a boat. (Always test with a magnet when buying S/S for the boat. Real S/S is not magnetic.)
> Wouldn't a plastic tank be better?
This might be OK if you can find one that fits the space, but it must be manufactured as a holding tank. You can't use a water or fuel tank, as there is a risk of the odour leaking into your accommodation. A S/S tank also has the benefit that it can be made to measure. While on the topic, all the plumbing for the heads system should be either purpose made or rubber exhaust hose. Anything else will smell.
> Also, doesn't that mean you have to mount the head
> above the level of the tank? Or maybe the flush
> action is enough to get the "material" uphill...
A couple of my friends have this system with the holding tank up under the deckhead and no discharge pump. They both have their heads installed at the normal height (not in the middle of the foredeck...) Neither of them have any problems flushing.
> I've heard of a guy that has his holding tank
> discharge below the waterline. When he's underway,
> the suction of the water rushing past the opening
> sucks out the tank, then he slows a bit to allow
> water to enter the tank, priming it for the next
> round of "material".
It might work, but this sounds like half luck, half science. Also, what would he do if he ever needed to empty his tank when the boat was not moving. I would guess this guy has his tank installed with the bottom few inches below the waterline. If the tank is above the waterline it is guaranteed to empty when the seacock is opened.
Even with a tank up under the deckhead, It might be an idea to mount (or mould if you have a glass boat) a flange ahead of the opening to make a venturi effect to help the suction. This will also reduce the turbulence from the opening. I'm planning to do this for my cockpit drains. Hopefully, this will also stop water slopping up through the drains when I'm hard on the wind and slamming into a headsea.
PS. How interesting that my first discussion on this list is about toilet systems. The pump in my Jabsco head needs rebuilding now after eight years of daily use. Not a task I'm looking forwards to, particularly as the outside temperature is 5°C (41°F) and there's half a gale blowing... I think I'll pump some strong bleach through it and let it sit for a day before I start.
Owen
--
@ Sjøhussenteret marina
68°43.13'N 15°24.74'E
Sortland in Vesterålen, Northern Norway
Owen H. Morgan, Yacht "Naomi J.", LD-9311
c/o Idrettsveien 6, 3188 HORTEN, Norway
http://pagina.de/naomi.j
Phone: +47 92053097
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