Thoughts on using ABS pipe for an exhaust gooseneck

[Rorzech]

I spent $300 on a light plastic goose neck that reminded me of my kids $15 Fisher Price periscope. Then I found some old PVC parts from some old Lenox Pulse furnaces. They have six inch PVC mufflers that you can put baffles for water barriers and great goose necks too. most heating companies have lots of that (scrap) laying around. You can even buy a bit that will bore out a pipe glued into a fitting. I like strong equipment. That little $300 plastic gooseneck scares me.

[Boatyarddog]

Originally Posted by Vince124

I'm replacing my exhaust gooseneck made of crumbling galvanized pipe and wanted to get opinions on using thick walled ABS pipe. Vetus makes their goosenecks out of plastic and since ABS doesn't have a true melting point, I'm thinking this should work. Thoughts?

IMHO, HECK NO!
Failure of your injection flow will compromise your safety.
Use a wire wrapped Exaust hosing!
Trident, or equivalent.
Exaust hosing, is made to work even if your water injection stops.
Don't be cheap, and this isn't being thrifty to use cheap plastic tubing to Exaust potentially lethal fumes.
Sincerely,
SV Cloud Duster

[Boatyarddog]

Originally Posted by Vince124

The injection point for cooling water is at the goose-neck? You do realize that a gooseneck and an injection elbow are idifferent things right? The gooseneck (a.k.a. swan neck) in this case is at the transom, while the injection elbow is at engine.

For all of you naysayers on ABS, please let me know why Vetus has been making their waterlock mufflers and goosenecks out of plastic for years.

Vetus Exaust stacks are not just ABS.
Composition of the plastic is different, a synthetic!
If Vetus can certify that their Exaust stacks are safe for Exaust gasses are just standard ABS plastic let them speak.
Because they are not!
SV Cloud Duster

[Vince124]

Originally Posted by Boatyarddog

IMHO, HECK NO!
Failure of your injection flow will compromise your safety.
Use a wire wrapped Exaust hosing!
Trident, or equivalent.
Exaust hosing, is made to work even if your water injection stops.
Don't be cheap, and this isn't being thrifty to use cheap plastic tubing to Exaust potentially lethal fumes.
Sincerely,
SV Cloud Duster

It has nothing to do with being cheap or thrifty. There's no room between the transom thru hull and the ceiling of the bilge to loop hose. I had metal in there and it rotted and crumbled leaving the "lethal fumes" to exhaust that you describe.

[Vince124]

Originally Posted by Boatyarddog

Vetus Exaust stacks are not just ABS.
Composition of the plastic is different, a synthetic!
If Vetus can certify that their Exaust stacks are safe for Exaust gasses are just standard ABS plastic let them speak.
Because they are not!
SV Cloud Duster

Sounds legit. Vetus goosenecks are made of pvc plastic that melts at a lower temp than it takes thick walled ABS to even start to become flexible. Same for rubber wet exhaust hose.
Maybe reading through the other replies would be a good idea.

[ben2go]

Good exhaust info here. https://www.sbmar.com/tonys-tips/

[nm55raven]

I recently replaced leaking 316 run of exhaust with silicon hose about 4 ft after elbow .i have monitored temps and found nothing above 140 F.
The silicon hose is rated to 375F but likely good till 400F.
They also make it with a stainless wire embed that may be possible to loop or bend to suit your application.

[Fuss]

Don't do this....
I didn't read all the posts but this is not good and neither is it good to have any plastic in the exhaust. If Vetus makes exhaust parts out of plastic, then don't install this either.

And the reason.... Its all great and works well until it doesn't.
Imagine the times when your impeller fails...your exhaust will go extremely hot and you will be replacing far more than just your impeller.

[sailorladd]

That's a great idea, just wondering if the salt water and diesel fumes would not make the plastic brittle, and what would you use as a glue? Perhaps nothing as there wouldn't be much pressure ...Good luck..

[ben2go]

Originally Posted by Vince124

The injection point for cooling water is at the goose-neck? You do realize that a gooseneck and an injection elbow are different things right? The gooseneck (a.k.a. swan neck) in this case is at the transom, while the injection elbow is at engine.

For all of you naysayers on ABS, please let me know why Vetus has been making their waterlock mufflers and goosenecks out of plastic for years.

They aren't plastic. They are a composite called marelon.



https://www.forespar.com/what-is-marelon.shtml

[Vince124]

Originally Posted by ben2go

They aren't plastic. They are a composite called marelon.



https://www.forespar.com/what-is-marelon.shtml

Waterlock mufflers come up as pvc on the Vetus website, but the point is moot. If an impeller fails, the Vetus muffler will melt as will hi-temp exhaust hose. See post #22 as well as a number of other claims about melting waterlock mufflers.
Vetus even states that their exhaust hoses can collapse above 100 degrees C https://www.vetus.com/media/magentom...21081849_0.pdf

I suppose the take away from this thread is the importance of an exhaust temperature alarm.

[johnmort]

Originally Posted by Compass790

If it's well after the water injection point it will work. Before, no chance. If before I'd recommend sched 10 316 ss pipe. You can do it screwed or welded. If welded should be 316L ss.
hope that helps

I work on various boats, do not use stainless steel it will rust away with standing saltwater inside it.
Flowing water is a little easier on ss but not standing water.
Use copper Nickel known as Cuni in the trade.
It will stand upto saltwater corrosion for a lifetime,well worth the expense

[Compass790]

Originally Posted by johnmort

I work on various boats, do not use stainless steel it will rust away with standing saltwater inside it.
Flowing water is a little easier on ss but not standing water.
Use copper Nickel known as Cuni in the trade.
It will stand upto saltwater corrosion for a lifetime,well worth the expense

The only place standing water will be is in his plastic muffler so paying for cupro nickel, if you can find it, is unnecessary.
No doubt it's superior but hard to obtain