[Public-List] Holding tank vent

[Mike Lehman]

I have had the holding tank with double vent lines (I use 5/8" because the 
fittings are for 5/8") installed for at least 15 years. I have been in rough 
conditions many times and have never experienced water entering the tank or 
flooding the head. It just doesn't happen.



~~~_/)_/)~~ Mike Lehman ~~_/)~~~


-----Original Message----- 
From: John Riley
Sent: Monday, March 04, 2013 10:11 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] Holding tank vent

I asked this same question before drilling holes in my bow...or a
similar one.  What about waves in rough seas.

I believe it was Mike Lehman that provided the obvious (once I thought
about it) answer that George gives below...any water intrusion into the
vent merely would go into the tank itself.

At worse, it would help clean the tank out.

I should add that I have a hand operated pump to pump the tank overboard
offshore where it is legal to do so vice a head that can be pumped
directly overboard.  Taking sea water into the holding tank, which has
never happened to us by the way, would only mean having to pump the tank
empty a bit earlier than I planned.

Regards,

JR


On 03/04/2013 04:57 PM, George Dinwiddie wrote:
> Randy,
>
> On 3/4/13 4:00 PM, Randy Katz wrote:
>> Greetings, Glen,
>>
>> I ran my vent tubes (2 of them) from the holding tank (in the same 
>> location
>> as yours) through the bulkhead and up into the dorade over the toilet. No
>> bad smells fliter back to the cockpit. The photo in the A30 collection of
>> ideas and photos shows vents at the bow, forward-- what about water 
>> coming
>> down them during heeling?
>
> I've never had any trouble with water in the vents. I used standard 
> right-angle fuel vents (one was already there from the Mansfield TDX 
> installation done by the previous owner) and have them angled down and 
> aft. The bow is pretty high, and the cockpit goes under long before the 
> bow does due to heeling. Sometimes the cockpit dips when crashing through 
> waves, but the angle of the vents doesn't seem to pick up any water.
>
> Of course, if they did, it would likely just drain into the tank. I worked 
> hard to eliminate any low spots where water could collect.
>
> Putting both vents in the same place would seem to me to be ineffective 
> for setting up a flow of fresh air. I've had lots of conversations with 
> Peggie Hall (who has sailed on Calypso, BTW) and she recommended the 
> strategy of venting on each side of the hull.
>
>  - George
>

-- 
John S. Riley
S/V Gaelic Sea
1972 Alberg 30 #521

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