Exhaust stack?

J

JAYROCK

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Joined
Sep 18, 2007
RO Number
28607
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272
Just an idea....... Why couldnt you make something similar to the exhaust stacks used on motorhomes. The kind used at NASCAR events and stadium parking lots. Something that could be used in a raft up or to keep from blowing exhaust on your slip mate.
We say at some slips with NO power or water on the Red River a few times a year. This is NOT an issue at our home marina that has power and water.
Normally we only have a few boat that make the run. this time it looks like 10 or 11. There are about 10 slips and like to space the boats as far apart as possible. Just looking for ideas on how to be safer when everyone is running their gennys!And YES we ARE going run the gennys!
 
because the exhaust water comes out the same pipe.
 
A water lift muffler can do exactly what you are asking for. That is, you have a wet exhaust from the engine to the muffler, and a "dry stack" ( and a water outlet ) from the muffler outwards. The stack can be routed out the side of the hull or straight up in a "flag pole" configuration while the water exit can be routed through the hull. Using the water lift also cools the exhaust so you do not have heat issues...
 
It's been done, using the water-separator muffler described above. Generator CO has been a problem on houseboats.

Pic below; the skinny "pole" is the generator exhaust.
houseboatstack.jpg


More info here: http://www.nmma.org/assets/cabinets/Cabinet55/Stack_Exhaust_Update.pdf
 
It would be a very simple design. The raw water jacketed exhaust manifold would never mix with the exhaust. It would simply go to a given height and run overboard. The exhaust tube would have an 'insulating tube' to protect from burning from the hot exhaust tube. Like on truck/tractors, with the vertical exhaust stacks. Some used expanded metal as the protective tube.

A lot of older work type boats used to have dry stacks.
 
That is exactly what I was talking about. I knew that the Houseboat industry had gone to something sim. I take it that my current muffler i have is different than what need!
 
Welcome to New England where virtually every lobster boat has a diesel engine with a dry exhaust. They pump the cooling water over the side through a thru-hull and run the exhaust pipe up through a corner of the wheelhouse to provide a little extra heat in cold weather.

Almost all big yachts (100 feet+) use dry exhausts. No reason that your generator - with the right style muffler - couldn't use a dry exhaust system. I'm not sure how user friendly it would be. You can smell the diesel from a lobster boat a long way off.

Bill
 
just look up air separator under exhaust parts. you'll find what you are looking for. no need to reengineer the boat. its simple and cheap to install and it also cuts down the exhaust noise to a level you probably wont hear.
 
How do the stacks work on the big Nordhavns...
Niles
 
I'm pretty sure the Nordhavens as well as other large trawlers use keel cooling. The exhaust is totally dry and the cooling water is piped in or out along the keel then back to the engine. It's a closed system. Virtually all shrimp boats down here in Texas use dry exhaust systems.
 
quote:
Originally posted by JAYROCK

That is exactly what I was talking about. I knew that the Houseboat industry had gone to something sim. I take it that my current muffler i have is different than what need!

Click to expand...


More than likely the current muffler is only part of what you need.

Here is a link to the rest.

Centek GEN#8208;SEP(tm)
 
quote:
I'm pretty sure the Nordhavens as well as other large trawlers use keel cooling. The exhaust is totally dry and the cooling water is piped in or out along the keel then back to the engine. It's a closed system. Virtually all shrimp boats down here in Texas use dry exhaust systems.
Click to expand...


Yep, this is how the Nordhavns are setup as well as a lot of commercial boats. The keel cooler is like a big heat exchanger that comes in direct contact with the seawater outside the boat so you don't need to pump raw water into the engine and out the exhaust.
 
quote:
Originally posted by JohnC

quote:
I'm pretty sure the Nordhavens as well as other large trawlers use keel cooling. The exhaust is totally dry and the cooling water is piped in or out along the keel then back to the engine. It's a closed system. Virtually all shrimp boats down here in Texas use dry exhaust systems.
Click to expand...


Yep, this is how the Nordhavns are setup as well as a lot of commercial boats. The keel cooler is like a big heat exchanger that comes in direct contact with the seawater outside the boat so you don't need to pump raw water into the engine and out the exhaust.

Click to expand...


this is partially correct, yes keel coolers are used to cool the main(s) but the exhaust gases are also cooled with sea water. in a high end application the stack is lined with a raw water jacket to insulate and remove heat. in a more conventional application like a ship air is used to displace the heat from the stack jacket. in a small boat application air and water jackets are impractical thus the Centec air/sep as noted by others is the easy solution. an uninsulated rubber exhaust hose can be used as the gases are cooled by the raw water already in the exhaust stream. its low tech and can be readly fitted in most applications.
 
Thanks Kida! The diagram helped me understand what was going on! We southerns are alittle slllllloww! LOL! Thanks again!
 
quote:
Originally posted by JAYROCK

...We southerns are alittle slllllloww! LOL! Thanks again!

Click to expand...


NAHHHH!

Y'All cain't help it if yor part of the world turns a bit slowwer than the rest of the earth.
 
Vic

"in a small boat application air and water jackets are impractical thus the Centec air/sep"

It's "Gen/Sep" - not Air/Sep.

Air/Seps are used on diesel air intakes to clean up oil mist and reduce intake noise.
 
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