Simplifying plumbing, vented loop

[Anthony Bavuso]

Peggie,Right now I have a pretty complex plumbing system that I want to simplify. My current setup allows you to either directly pump overboard, pump into the holding tank, use a pump out station with the deck fitting, or use a manual pump to pump the tank overboard.This setup gives a lot of options but it also has a lot of hoses, y-valves, vented loops, and other stuff involved. I want to simplify all this.My new setup I plan to have all sewage go into the tanks from the head. Then have a y-valve in the tank exit line and allow switching between the pump out deck fitting, or the manual pump and sea valve to pump the tank overboard.So my question is with my new proposed setup do I need a vented loop? My head by the way is below the waterline if that makes a difference. Also what do you think of my new proposed setup? Is it a bad idea?

 

[Peggie Hall/Headmistress]

Proposed set up is ok...

While you don't need a vented loop between the head the tank to protect the boat from sinking, I'd leave it in to prevent tank contents from backing up into the bowl when you're heeled.There should also be a vented loop between the tank "dump" pump and the seacock...that one IS to prevent seawater outside the boat from seeking it's own level inside the boat.And since your toilet is below the waterline, there should be one in the intake (between the pump and the bowl, not between the thru-hull and the pump)...prob'ly the most critical one of all.

 

[Anthony Bavuso]

Water coming out of vented loop

Peggie,As I was overhauling my plumbing I placed a forespar vented loop in between the head pump and the bowl per your suggestion and the diagram that Raritan has in their manual. The problem now is that whenever I pump water into the bowl water also squirts out of the vented loop. Is that normal?