sink drains

jefflaw35 · Post by **jefflaw35** » Mon Feb 13, 2012 2:50 pm

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

Stripermann2 · Post by **Stripermann2** » Mon Feb 13, 2012 3:23 pm

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

prowlersfish · Post by **prowlersfish** » Mon Feb 13, 2012 3:47 pm

Your cool for now

Muskokan345 · Post by **Muskokan345** » Mon Feb 13, 2012 4:02 pm

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.

Stripermann2 · Post by **Stripermann2** » Mon Feb 13, 2012 4:09 pm

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

jefflaw35 · Post by **jefflaw35** » Mon Feb 13, 2012 4:15 pm

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?

jefflaw35 · Post by **jefflaw35** » Mon Feb 13, 2012 4:16 pm

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!

Muskokan345 · Post by **Muskokan345** » Mon Feb 13, 2012 4:23 pm

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

Torcan · Post by **Torcan** » Mon Feb 13, 2012 4:39 pm

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

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

Stripermann2 · Post by **Stripermann2** » Mon Feb 13, 2012 4:52 pm

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..?

Paul · Post by **Paul** » Mon Feb 13, 2012 5:13 pm

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.

Vitaliy · Post by **Vitaliy** » Mon Feb 13, 2012 5:14 pm

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

Stripermann2 · Post by **Stripermann2** » Mon Feb 13, 2012 5:16 pm

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.

Muskokan345 · Post by **Muskokan345** » Mon Feb 13, 2012 5:19 pm

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.

jefflaw35 · Post by **jefflaw35** » Mon Feb 13, 2012 5:24 pm

all of mine are even right above the water line stripe