Why does cooling water exit above waterline?

[meirriba]

Originally Posted by Muaddib1116

I'm pretty sure most monohulls have the the sinks drain below the waterline.

I am pretty sure they do not.
As I have written in previous post, you'll need a pump to press the discharged fluid into the sea.
And of course, any builder strives to minimize number of underwater throughhulls for safety reasons (and costs - underwater discharge needs also a sea cock)

[Muaddib1116]

Originally Posted by meirriba

I am pretty sure they do not.
As I have written in previous post, you'll need a pump to press the discharged fluid into the sea.
And of course, any builder strives to minimize number of underwater throughhulls for safety reasons (and costs - underwater discharge needs also a sea cock)

Yeah, pretty sure you're wrong. And yes, the drains have seacocks.

[Dave22q]

My A/C discharges above the WL and that's the way I want it. It is not very much above the water (6") so not a lot of extra lift. From what I've seen it's a common setup. Sink in head drains above, galley sink drains below, consistency being the hobgoblin of small minds'. I suspect ease of construction dictated both locations.

[Spindrift NH]

Originally Posted by meirriba

I am pretty sure they do not.
As I have written in previous post, you'll need a pump to press the discharged fluid into the sea.
And of course, any builder strives to minimize number of underwater throughhulls for safety reasons (and costs - underwater discharge needs also a sea cock)

I hate. To step in the middle of this but on both of my monohull sailboats the galley sink drained below waterline. Both had a proper seacock.

[cal40john]

Originally Posted by meirriba

I am pretty sure they do not.
As I have written in previous post, you'll need a pump to press the discharged fluid into the sea.
And of course, any builder strives to minimize number of underwater throughhulls for safety reasons (and costs - underwater discharge needs also a sea cock)

Do a simple test. Get a clear hose or tube. Fill a sink with some water. Put one end of the tube under water. Pour water into the other end of the tube. Report back your results.

I have sailed on 20 - 30 monohull sailboats. (Advantages of belonging to a club) All had drain lines underwater, only one had a pump.

This boat that had a pump on the drain line was a German Frers designed 49' narrow, heavy, slack bilged, low to the water ocean racer. I believe he was inspired by 12 meter boats. The sinks were below the waterline.

[Clivevon]

Originally Posted by meirriba

Probably you are mistaken.
I have never seen kitchen sink on a boat to be drained underwater.
You would need a pump to press the discharged fluid into the sea.

Mine does. Always has for the last 40 years. No problem that I have ever noticed.

[Muaddib1116]

Yeah, my galley sink and head sinks are above the waterline, so drain by gravity, and my shower drains are below the waterline, so there is a pump, which pumps it up to the head sink drains.

[Clivevon]

The kitchen sink waste is shared with the "tidy up" electric bilge pump. That lives 30 inches under the floor boards - the bilge pump hose comes up in a swan neck before dropping down to tee into the sink waste before exiting through a double clipped Trufit ball valve which I leave open.
The damage control pump is higher up & has its own larger hose through the topsides.

[meirriba]

Originally Posted by Muaddib1116

Yeah, pretty sure you're wrong. And yes, the drains have seacocks.

Do they have pumps?

[Muaddib1116]

Originally Posted by meirriba

Do they have pumps?

No, gravity.

[ilenart]

My generator has a water separator positioned above the water line that discharges the water below the waterline and the dry exhaust above the waterline. Is receommended by the manufactuer (Whisperpower) as the most quiet method of dealing with the wet exhaust. I’ll see if I can find the brochure that shows the setup.

Ilenart

[ilenart]

Originally Posted by ilenart

My generator has a water separator positioned above the water line that discharges the water below the waterline and the dry exhaust above the waterline. Is receommended by the manufactuer (Whisperpower) as the most quiet method of dealing with the wet exhaust. I’ll see if I can find the brochure that shows the setup.

Ilenart

See page 11 of the attached

https://www.whisperpower.com/downloa...pdf&map=phpimg

[Gudgeon]

Yep on all three mono hulls the sink drain is below the water line. On the 24 footer had to close the seacock so we did not get water in the boat if rounded Up/down. On our 44 footer it is a straight hose exiting next to the keel. Most mono hulls we looked at where buying the 44 footer were this way. My AC's (3) bilge bumps (3) water maker and shower sumps (2) all are above the water line. If they were below the water and any of these were to fail you would flood the boat.

[meirriba]

Originally Posted by Muaddib1116

No, gravity.

So, once again, how does the hose empty itself against the water pressure of the sea?
I think you agree that the hose is full of seawater up to the waterline.

[Gudgeon]

Originally Posted by meirriba

So, once again, how does the hose empty itself against the water pressure of the sea?
I think you agree that the hose is full of seawater up to the waterline.

Yes there is water in the hose there is also a goose neck in it. Have to layy the 44 footer over hard to get water in via the sink.