Trojan Boat Forum

is it still legal to have your sink water drain directly out? or should i reroute to waste tank.

We call it Grey water and in our parts, you can drain overboard. Including shower water.

Your cool for now

Drain overboard. One question though, as I look under my sink, there is a loop in the flex pipe, creating a trap arrangement, is this necessary as it drains overboard, or is there a reason I am missing, like critters climbing in that way.

The loop is so it doesn't syphon sea water back into the sink...It creates a "Break".

hmmm mine was straight, so create loop, CHECK!! Paul i was expecting that answer, think maybe i will run bothways with a gate valve so when the time does come I will be ready with having to do extra work. its all open now, think it would be a smart move?

Muskokan345 wrote:Drain overboard. One question though, as I look under my sink, there is a loop in the flex pipe, creating a trap arrangement, is this necessary as it drains overboard, or is there a reason I am missing, like critters climbing in that way.

thanks for bringing that up, i wouldnt have thought of it as mine didnt have the loop, good call!

Okayyyyyy, If sea water came up that far, wouldnt I have bigger problems?

Muskokan345 wrote:Okayyyyyy, If sea water came up that far, wouldnt I have bigger problems?

My thoughts exactly, I was thinking "HUH"????

Muskokan345 wrote:Okayyyyyy, If sea water came up that far, wouldnt I have bigger problems?

If your drain through-hulls are near the boot stripe, as most are, on turns, rocking or with splash, while underway, the opening creates a syphon... and vacuums water into the through-hull opening, much like the venturi effect.
Air, will stay at the highest point in a loop. Water trying to back fill can't flow past this block of air, and such, we have a "syphon break".

Get it now..?

In the 26' siphoning isn't an issue. The drain on the galley sink are normally straight out and about 18" long. If there's a bend in it to form a trap, its to keep wind from whistling thru the drain at the dock. And oh yah, if you have water up that far in these boats you are probably swimming.

all my drains on the f46 go streight overboard except for the heads and its perfectly legal

Vitaliy wrote:all my drains on the f46 go streight overboard except for the heads and its perfectly legal

Yes, some are straight and some aren't. Heads, genny's etc use a syphon break.

Paul, I'm with you, not the swimming part, the part about straight out from sink drain. I figured it was probably a PO, that thought you needed a trap, for whatever reason. Thats the way its been on both my other boats.

all of mine are even right above the water line stripe