[Public-List] Head questions ...

[Gordon Laco]

Good morning Jonathan,

Here's some input.... I'll put my comments below your questions.


On 10/03/11 7:47 AM, "Jonathan Adams" <laughing_gull at verizon.net> wrote:

> Some quick questions on installing heads.
> 
> 1. Is there any reason to put the vented loop on the intake? I have never had
> this before, but I have seen it on a few installations
A vented loop here will inhibit the possibility of the intake siphoning
water into the head's bowl through the valves of the flushing pump.  Boats
have been flooded and sunk by this sort of thing.  The pump's valves are not
intended to be proof against back flooding so the vented loop is protection
against the time somebody forgets to close the sea cock after the head has
been used.
> 
> 2. I plan on having the vented loop between the head and the holding tank.
> Have 
> people had problems with waste siphoning from the tank back into the head.
> When 
> the head was connected to the through hull, this made more sense.
I think a vented loop between the head and the holding tank might make bad
odours a near certainty.  Much better to position the two so that sewage
coming back into the head is not an issue.
> 
> 3. Does anyone have the rough  measurements handy from the head to the tank in
> the standard port bunk position, and from the tank back to the exit by the
> shrouds (middle of the head closet)? I will be down at the boat this weekend,
> but ... was hopping to get things ordered before then.
I've got no direct experience with that; SURPRISE is an apres 400 boat so I
use the built-in tank beneath the main cabin sole.
> 
> Any help appreciated.
> 
> Jonathan
> 197
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