EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: prussian7489 On: Sun Jun 22, 2008 2:07 am

Would anyone know of any reasonably adequate high temperature sealant that may be applied to the backside of the pressure vessel around the coil and overall back plate of the pressure vessel on the EFM 520? Any sealant that may last a season or two would be pretty cool!
prussian7489
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: Freddy On: Sun Jun 22, 2008 5:31 am

Are you saying that you have a leak and are looking for some goopy stuff to stop the leak? There is no product that I would attempt to use for that purpose.
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: stoker-man On: Sun Jun 22, 2008 6:10 am

If the back of the boiler is rusted out, it's because the coil gasket wasn't kept sealed by tightening the nuts once a year. Repair plates are available for replacing the damaged area. Otherwise there is no sealer to stop pinhole leaks.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: prussian7489 On: Sun Jun 22, 2008 11:37 am

Did anybody contact NASA cause they had a high temp patch to use on the Space Shuttle as a repair kit for the tiles which maintained adhesive properties at high temperature. Of course this would not maintain structural integrity under pressure I am just considering such a substance as a patch against leakage. Maybe it is not doable under such temperature and pressure but there is some amazing stuff out there ya never know nowadays!
prussian7489
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: Freddy On: Sun Jun 22, 2008 11:58 am

I'd venture a guess that some sort of epoxy putty might work for a day or two. The problem you'll face is heating and cooling. The steel will expand and contract at a different rate than the patch & within very few cycles it will fail. The space shuttle glue only has to last 14 minutes!
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: prussian7489 On: Sun Jun 22, 2008 3:02 pm

That is a good point but and may be so but if I could point to the SR20 aircraft which is made of titanium and I think it is covered with a black paint or some substance. I know those leading edge wing surfaces get incredibly hot soooo is it still so incredible to have a resilient high temperature sealant?????
prussian7489
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: gaw On: Sun Jun 22, 2008 4:31 pm

I saw something in a bottle that you can dump in the boiler water and if you have a leak this stuff hardens when it contacts the air. I think it is primarily made to seal leaky pipe thread connections. I never used it, just saw it in a store and read the bottle label. Sounds like snake oil, maybe it works, maybe not. I don't know.
gaw
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice from Schuylkill County

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: Freddy On: Sun Jun 22, 2008 5:24 pm

The Shuttle is not made of titanium. It is aluminum. If it were titanium, Discovery might have, just maybe, survived the problem.

The stop leak sold for boilers will stop a leaky pipe thread. I don't believe it will work on a rusty hole but might be worth a try.
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: stoker-man On: Sun Jun 22, 2008 5:38 pm

That "radiator repair" also coats the outside of the water coil. As much as you don't want to, you should have it fixed properly.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: LsFarm On: Sun Jun 22, 2008 5:59 pm

The SR20 never stopped leaking,, untill it got up to altitude, and the airframe warmed up,, it leaked.. there were several instances where the leaking fuel caught fire on the ground from the afterburner's flame... rather spectacular..

If your coil gasket is leaking,, drain the system, buy a new gasket, and use Permetex's 'Ultra Black' RTV sealant, available at good automotive stores to seal the irregular surfaces under the gasket.. tighten the plate gently with many gradual tightenings of the nuts.. let the 'Ultra Black' set up over night..

If you have pinhole leaks in the actual boiler outer wall of the water vessel,, you need to do some serious repair,, cutting out and replacing or plating over the erroded spot...

The heat and pressure will loosen any sealant I can think of... You may try 'JB Weld' or 'Marine Tex' many people have good luck with this product in automotive and Marine applications.. Both are two part epoxy based products.. both can be drilled and tapped for threads after a few days..

If you have pinholes.. drill and tap, use either JB weld or Marine tex as thread sealant, and over the whole head of the bolt,, thread the bolt into the threaded hole... and make an extra large offering when the plate is passed...

Greg L

.
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: prussian7489 On: Sun Jun 22, 2008 7:15 pm

Sure Shuttle made of aluminum SR20 is made of titaninum and yes it leaks like hell but they did apply a coating to the titanium skin for radar absorbancy to make it stealthy. So you can get a coating on metal which will hold under temperature the question is for how long? Gary is probably right and the best idea under the quick and dirty fix category drilling tapping and sinking a bolk with thread sealant for pinhole leaks. Anybody think of an objection to just welding the coil plate permanently to the back plate to seal it permanent until the whole back plate MUST be replaced? Please speak your mind I think we still live in a democracy?
prussian7489
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: stoker-man On: Mon Jun 23, 2008 5:55 am

http://nepacrossroads.com/download/file ... &mode=view

This is the part you need. We are also making a new sized plate which is 3" larger in all directions.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: Freddy On: Mon Jun 23, 2008 6:45 am

I'm sorry... we were talking shuttle and when SR20 was mentioned I did a brain lapse on the Blackbird and thought you were talking shuttle flight, like STS20.

Looks like Stoker-man has the answer. It'd take an hour in the welding shop, but...not buts... get 'er done!
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: gaw On: Mon Jun 23, 2008 1:25 pm

prussian7489 wrote:Anybody think of an objection to just welding the coil plate permanently to the back plate to seal it permanent until the whole back plate MUST be replaced? Please speak your mind I think we still live in a democracy?


Are there soldered fittings on or near the water coils cover plate that could be compromised by the heat from welding? Other than that I say it's yours do what you want. I would only do it as a last resort. I would sooner fix it the proper way so that I could replace the coil down the road if needed. If the rust and corrosion is that bad that installing a repair plate can't be done, then how can you weld the coil in. I am just speculating here, obviously I have not seen what you have to work with. I think we can all agree the boiler is yours to do with as you see fit. Good luck, hope it works whichever way you go with it.
gaw
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice from Schuylkill County

Re: EFM520 PRESSURE VESSEL HIGH TEMP SEALANT

PostBy: stoker-man On: Mon Jun 23, 2008 2:10 pm

Are you going to remove the gasket first? The inlet and outlet fittings are brazed. I would do it as a last resort.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove