Originally posted by Al Schober
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New hot section: Do I need to remove exhaust flange?
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Originally posted by edwardc View PostThis is a very typical failure in the hot section. The nipple is exposed to some of the hottest gases, and the bottom of the thread grooves in the nipple are the thinnest point of the whole system. And its under the worst stress from the weight of the system.
I've seen three hot section failures on other boats, and they all played out like this. It's one of the reasons I went with stainless pipe when I rebuilt my hot section. Hopefully it will hold up better.
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Originally posted by ernst View PostWhere can you buy stainless components, like nipples?
One of the fastest growing pipe fitting distributors in the US. Majority of orders ship within 48 hours, free shipping over $99 and 99.6% order accuracy fulfillment rating.
They take Paypal - go for the 316 S/S - it isn't much more than 304 S/S but is much more suitable for marine use.
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Originally posted by 67c&ccorv View PostI have been using these guys;
One of the fastest growing pipe fitting distributors in the US. Majority of orders ship within 48 hours, free shipping over $99 and 99.6% order accuracy fulfillment rating.
They take Paypal - go for the 316 S/S - it isn't much more than 304 S/S but is much more suitable for marine use.
Do you have any experience about the longevity of S/S in this application?
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Originally posted by hanleyclifford View PostIf you decide to go with SS components be sure not to wrap them. They do not like the anerobic environment.
Also, the corrosion seems always to start from the inside. Isn't that very anaerobic? OTOH, I found the ABYC rules for exhaust (http://dms.ntsb.gov/pubdms/search/do...num=DCA97MM012.) and they, indeed, list stainless (316L) together with black iron.
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In most cases exhaust hot sections do not corrode from the inside where a coating of carbon usually offers protection. The corrosion usually is on the outside where moisture collects between the pipe and the wrap. The stainless pipe would only offer an advantage if it can be left unwrapped. IMO, SS is not worth the extra money. A black iron rig should be good for 7 or 8 years easily, then just replace the whole thing again.
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Originally posted by hanleyclifford View PostIn most cases exhaust hot sections do not corrode from the inside where a coating of carbon usually offers protection. The corrosion usually is on the outside where moisture collects between the pipe and the wrap. The stainless pipe would only offer an advantage if it can be left unwrapped. IMO, SS is not worth the extra money. A black iron rig should be good for 7 or 8 years easily, then just replace the whole thing again.
Black iron is certainly MUCH more cost effective! And indeed mine held up for 8 years.
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Eight years and still strong. Paint and wrap.http://www.moyermarine.com/forums/pi...&pictureid=701
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here ya go hanley..
Wrap the [ img ] tag around that and it should show right up in the thread!
(Hit the quote button on my post to see how I did it.)
This is also the same trick you can use to re-post photos without uploading them multiple times on the forum..once it is uploaded, it lives here..use your "User CP" to find all attachments you've previously uploaded and simply wrap the URL of the picture's location with the same [ img ] tag (with no spaces).
Last edited by sastanley; 09-24-2012, 04:03 PM.-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
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A bad purchase, and a new improved material
Originally posted by ernst View PostHm. I have added a can of High heat coating from MMI's exhaust section to my order. I hope that will have a similar effect.
"In other news," a friend suggested to use Schedule 80 instead of Schedule 40 pipes, because of the thicker walls. That makes a lot of sense, I will do that.
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Whoa...ernst, I am confused.
Why not wrap the pipe in the new Moyer wrap, and then spray the wrap with the spray? I think that is how it goes, unless I do not understand how it works.
What is the difference between the wrap you have and the stuff you got from Moyer...??-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
sigpic
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