[Alberg30] It's That Holding Tank Thing Again (and Group Buy?)

[George Dinwiddie]

I added #4 because the air vents weren't mentioned at all.  On the
tanks in the previous group purchase, having the air vent fittings
on the top of the tank proved to be a problem for the older boats,
because the V-berth sits a little lower than in the new boats.
There was approx 1/4" inteference with the V-berth plywood.

The use of two vents instead of one is a suggestion of Peggie
Hall.  See http://www.boatsafe.com/nauticalknowhow/phall.htm#oder
or http://www.raritaneng.com/Products/Holding_Tanks/Catht1.pdf
pages 3-4.  You'll also note that Peggie recommends a 3/4"
(or even 1") vent line.  If you use the standard 5/8" vent
line, but use two of them, you not only get better crossflow,
but the combined effective diameter is 7/8".

Yes, up higher is better, as long as the tank fits.  Near the
fore-aft center-line of the tank is also better, as it keeps 
the vents higher as the boat heels.

 - George

> EddieDiver at aol.com said:
> 
> George; in the added paragraph #4 wherein you mention the problem with the 
> air vents and hoses on the top of the tank, what was the problem? On #303, 
> Emotional Rescue, we have a slight odor but nothing else. The idea of adding 
> a port and starboard vent hose is interesting. But it would seem better to 
> get the vents up higher in the tank rather than on the forward "side". Ed. 
> Schroeder 

-- 
 ----------------------------------------------------------------------
  George Dinwiddie                             gdinwiddie at alberg30.org
  The gods do not deduct from man's allotted span those hours spent in
  sailing.                                    http://www.Alberg30.org/
 ----------------------------------------------------------------------

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