Home

Installing a Raritan holding tank in a newer A30


Venting the tank

Two 3/4" ID vent hoses run forward to the bow. If you've ever read Peggie Hall's pamphlet, Marine Sanitation: Fact vs. Folklore, then you'll understand that you need a flow of air in and out of the tank. This means big vent hoses, short straight runs, and a scheme that moves the air through the tank. In this installation, the vent hoses are not as short and direct as I'd like. And they're only 3/4" because that's what worked with the tank and through-hull vents. But it's adequate.

The hoses are held level with clamps I fabricated out of a scrap of 3/4" polyethelyne board. It's important to eliminate low spots where moisture might accumulate and block the airflow.

The key to the airflow through the tank is mounting a vent on each side of the bow. In the same manner that air flowing along the sail creates a high-pressure zone on one side and a low-pressure zone on the other, so it is with the airflow down the hull. As long as the airflow is not exactly symmetrical, the same effect will be seen. Since the pressure will be greater on one side relative to the other virtually all of the time, air will flow through from that side to the other.

Special thanks to Mike Lehman of Gilleleje, #505, and Jim Mennucci of Quest, #433, who blazed the trail with the Kracor tank.


In Association with Amazon.com Boating Magazines at discounted prices.




Amazon Associates logo

Privacy and other policies
page created by George Dinwiddie
webmaster@alberg30.org
copyright © 1995-2017, all rights reserved
Last modified: Friday 04-Jan-2008