[C38] head on a box

[Don Strong]

Max: Gosh if the boat heals while sailing, the box has to be taller. The 
PO could have placed the head on a 4 foot box just under the hatch, 
where the user of the head could watch the sailing action!  Seat belts 
might be necessary.
D

On 11/1/11 7:44 AM, Max Soto wrote:
> Steve,  Since the loop+vent breaks the siphon, the "pressure" on the 
> joker valve is from the grey water located between the head and the loop.
> Don, same thing happened to the PO, so he made a box that raises the 
> head about 7 inches, and added a vented loop to the intake hose. 
>  Apparently he found he boat with 1' of water. I think that the vented 
> loop for the intake  is enough, so I'm going to remove the riser box. 
> Short people have their feet on the air while seating in the head!
>
> Regards,
>
> Max
>
> 2011/11/1 Don Strong <drstrong at ucdavis.edu <mailto:drstrong at ucdavis.edu>>
>
>     Steve: I did the vented loop head-to sea retrofit because my
>     insurer demanded it.  Big job! The exit hose goes up the along the
>     hull, through the sink top and reaches an apex are just under the
>     deck. The vent is at the apex. The loop+vent breaks the siphon. I
>     don't see how the grey water problem is any different between
>     "overboard" and "waste tank." When the valve is thrown to tank,
>     grey water sits behind the joker valve just as it does when the
>     valve is thrown to overboard.
>
>     I also installed a vented loop for the sea water intake for the
>     head after we awoke with 6" of water in the boat (someone "moi?"
>     was too sleepy to flip the switch to "dry bowl during the night). 
>     There is also a vented loop on the sea water intake for engine
>     cooling. I recently replaced the vent.
>     Don
>
>
>     On 10/31/11 11:43 PM, Steve Smolinske wrote:
>>     Question for anyone with a vented loop in their head discharge.  
>>     Looking at it on paper it seems that the pressure of the grey
>>     water in the section from the head to the vented loop would be
>>     enough to leak back into the toilet bowl.  I know there is a
>>     duckbill valve and a flapper valve in the head to stop the
>>     reverse flow, but as we all know if you leave the discharge
>>     seacock open the head will fill up.   Does the vented loop work
>>     because the head pressure of the grey water in the run from head
>>     to loop is not as great as that coming from the seacock?  Any
>>     experiences are greatly appreciated.   Thanks
>>     Steve
>>
>>
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>
>     -- 
>     Donald R. Strong
>     Professor
>     Dept. of Evolution and Ecology
>     University of California, Davis 95616
>
>
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>
>
>
> -- 
> Max Soto
> C38 #198 ESTANCIA
> Puntarenas, Costa Rica
>
>
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-- 
Donald R. Strong
Professor
Dept. of Evolution and Ecology
University of California, Davis 95616

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