2 hoses 1 thru hull?

[bmm32005]

Bet it's a bad question but here goes. Can a sink drain and engine raw water be tied into the same thru hull? I'm just trying to avoid drilling a hole for my new Frigoboat keel cooler. I would use the sink dran thru hull for the keel cooler.

[rtbates]

I personally would not connect the engine raw water intake to anything else. Too important.

[ssanzone]

yeah but...

if you mean raw water intake, then no. the 'stuff' you wash down your sink would end up in your engine (assuming it is running) and there is a strainer on that thru hull.

if you mean the exhaust, just make sure u have an inline check valve and the sink 'T' is between the check value and thru hull.

i admit i am struggling to picture a configuration where this seems logical.

why not T into the cockpit or deck drains?

[witzgall]

The frigoboat keel cooler thru-hole does not bring water into the boat, it allows a closed loop from the compressor to be cooled outside of the hull.

Chris

[SailK2]

My boat has a custom SS manifold tank with 3 outlets valves which are fed by a single thru hull. The outlets feed 1) engine raw water intake 2) genset raw water intake 3)spare.

Keep in mind this manifold is 3x as vulnerable to a leak as a single dedicated raw water engine line. The manifold and it's hoses all have new hose and all lines are double up on hose clamps for security.

[jackdale]

I have seen a head sink drain and head intake share a thru-hull. It took me some time to figure out why. When the sink fills with water while heeled, you can drain the sink by closing the thru-hull and pumping the head while in the wet bowl position.

Engine raw water = separate thru-hull that is easily accessible.

[jeepbluetj]

Originally Posted by jackdale

I have seen a head sink drain and head intake share a thru-hull....

The other reason is fresh water flush - flush with water from the sink.

Agree with the others - engine thru hull should not be teed in with the galley drain due do junk being washed down and sucked up into the engine cooling loop.

[jtsailjt]

Originally Posted by jeepbluetj

The other reason is fresh water flush - flush with water from the sink.

Agree with the others - engine thru hull should not be teed in with the galley drain due do junk being washed down and sucked up into the engine cooling loop.

Also, I would worry about the engine sucking air down the sink rather than water up through the thru-hull, causing bubbles in the engines heat exchanger and/or failure of the raw water impeller, either of which would cause the engine to overheat. If you are going to "T" an intake, both things it leads to should be either outward or inward flow items and you may need checkvalves in the case where one item creates a very strong suction.

[bmm32005]

I'll fire up the hole saw soon. Thanks everyone.

[Tellie]

Originally Posted by bmm32005

I'll fire up the hole saw soon. Thanks everyone.

It's the right way and you'll be more happy you did in the long run.