Eber exhaust pipe

[Ian_Edwards]

Eynhallow has a Hydronic 10 fitted and I'm renewing the exhaust system. The reasons why will become obvious from the photos!

The original system had a very tight, and almost 180 deg bend in it, close to the skin fitting, to get the swan neck required to keep the water out.

I've bought a new inner exhaust pipe 500mm longer than the original so I don't have to make such a tight bend.

When I took the system apart, I found that part of the exhaust system has been reinforced with a larger diameter section of SS exhaust hose. This is a section which passes through a locker, so I guess it's to stop the exhaust hose from being crushed. I intend to reinstate the reinforced section. The ends of the reinforcement are sealed with a white sealant.

Does anyone know what this sealant might be?

Or what I could use in it's place?

The sealant will get hot, the exhaust is covered by an insulating sock and placed with a 60mm conduit, (the same types as you'd use as a hot air duct)

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[GrahamM376]

Possibly high temperature silicone.

 

[vyv_cox]

Yes, silicone is the only elastomeric sealant that might take that sort of temperature. When I needed to adapt exhaust hose sizes in that way I welded up a small adaptor from short lengths of stainless tube of the appropriate size. Trying to bodge it together with sealant could lead to tragic circumstances.

 

[Ian_Edwards]

There's no joint in the inner exhaust pipe, it's simply a sleeve to reinforce the pipe as it passes through the locker.

Thanks for the info' on High Temperature Silicone Elastomer, I'll get some ordered today.

 

[David2452]

I wouldn't reinstate that if it is to stop crushing I normally use a length of SS tube, cover it with this http://www.mikuniheating.com/Details.cfm?ProdID=520 to protect surrounding stuff from heat, which is probably the origonal intent anyway. make sure you use exhaust assembly compound on all joints.

 

[savageseadog]

The more you insulate the exhaust pipe the hotter the exhaust will be, both at the heater end and the skin fitting end. I favour using a stainless mesh cage with spacers.

 

[David2452]

The more you insulate the exhaust pipe the hotter the exhaust will be,

That's actually a part of the reason for insulation, to keep it hot, the skin fitting will take care of the heat and there is already hot exhaust gas at the heater. Hot gasses mean less precirpitation of acids and water inside the pipe which accelerate failure.