[Public-List] holding tank vent

[Kris Coward]

That's quite the impressive rise. I've got one of the under-sole,
integrel-to-liner holding tanks (which has fallen into disuse since the
installation of a composting toilet), and remember that it didn't
require that tall a sewage column up the vent and pump-out hoses to get
the tank (and sole) to bulge visibly.

In fact, I can remember one time that I went to pump out, and kept
getting nothing into the pump-out machine, and just losing pressure. Now
the machine was a touch leaky under suction (fortunately this just meant
that air seeped in, rather than anything seeping out), so I figured that
there was perhaps a slight clog in my pump-out hose. I also figured that
maybe I could dislodge it and force it through by flushing a few more
strokes into the holding tank to build up back pressure in addition to
the suction. A half-dozen strokes or so into trying this, I discovered
that the problem was actually that the pump-out hose had disconnected
from the deck fitting (and I'll leave it to you to infer just how I
found that out)...

Cheers,
Kris

On Thu, Mar 07, 2013 at 08:55:53AM -0500, Mike Lehman wrote:
> This reminds me of a funny story. A couple in Florida bought a brand
> new boat. After several months they went back to the broker and
> complained that of a foul smell in the boat. The broker visited the
> boat and asked then how often they pumped out the holding tank. They
> replied that they have never had to empty and were very pleased with
> the extra large capacity of the tank because it never seemed to fill
> up. As it turned out the vent line for the holding tank was led up
> into the mast all the way to the spreaders. When they removed the
> mast to investigate the foul smell the mast was full of shit that
> was overflowing the vent line.
> 
> 
> 
> ~~~_/)_/)~~ Mike Lehman ~~_/)~~~
> 
> 
> -----Original Message----- From: John Boor
> Sent: Thursday, March 07, 2013 8:23 AM
> To: j_l_brown ; Alberg 30 Public List -- open to all
> Subject: Re: [Public-List] holding tank vent
> 
> On MAHSEER #380 the tank vented into the base of the mast this kept out
> all water intrusion and the odor exited at the mast top, and for you smart
> a#$@$ people it also was a secondary holding tank.
> 
> John Boor
> 
> >I vented it through the cabin side in the head, used a fuel tank stainless
> >vent fitting. Â I angled the vent slightly aft as well.
> >
> >If you were wanting to use a one way valve on the vent, you could add a
> >suction one way valve to the tank, they mount flush. power boats with
> >carbon filters on the tank vents use them. Â
> >
> >I'd think about using a tank additive then, there's a good one that helps
> >prevent most anaerobic growth issues, mostly used in commercial waste
> >water treatment. Â Cheap, ok for environment and easy to use.Â
> >
> >Otherwise even the nicest tanks and hoses eventually stink.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >Sent from Samsung Mobile
> >
> >-------- Original message --------
> >From: Stephen Gwyn <stephen.gwyn at nrc-cnrc.gc.ca>
> >Date:
> >To: public-list at lists.alberg30.org
> >Subject: Re: [Public-List] holding tank vent
> >
> >>I'd say the geometries are quite different if the vent is at the beam of
> >>the boat instead of up on the bow.
> >
> >Yes.
> >
> >If a spot 6 inches below the rail at the beam is under water continuously
> >,
> >that's normal, you're just heeled. If your bow is under water
> >continuously,
> >you've got real problems.
> >
> >I must confess I took 2 hours getting ready to drill the holes for
> >the vents. Drilling holes in test pieces of wood, trying different
> >bits, measuring, re-measuring, but mostly just procrastinating
> >out of fear. Then I drilled the holes in about 15 seconds flat.
> >
> >SG
> >
> >
> >
> >--
> >------------------------------------------------------------------------
> >Stephen Gwyn                       | Tel:
> >1-250-363-3136
> >Canadian Astronomical Data Centre  | Fax: 1-250-363-0045
> >Herzberg Institute of Astrophysics | Cell: 1-250-885-6969
> >5071 West Saanich Road             | E-mail:
> >Stephen.Gwyn at nrc-cnrc.gc.ca
> >Victoria, BC, V9E 2E7, Canada      |
> >http://astrowww.phys.uvic.ca/~gwyn/
> >------------------------------------------------------------------------
> >
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-- 
Kris Coward					http://unripe.melon.org/
GPG Fingerprint: 2BF3 957D 310A FEEC 4733  830E 21A4 05C7 1FEB 12B3

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