St. Croix Greenfield exhaust pipe cap burn through

[BenA]

I have been burning corn in a St. Croix Greenfield for many years and have had on going problems with the exhaust pipe cap burning through. I have also replaced the entire pipe one time because the top was corroded. I am using Duravent pipe approved for corn and a stainless steel cap. The pipe runs about 15 feet straight out the roof and appears to accumulate fly ash at the top. I do a mid season exhaust pipe cleaning. Any suggestions?

 

[Bioburner]

Welcome to the forum.
Have you thought of upgrading to a better pipe. The savings you have enjoyed burning corn could get you some nice Selkirk and may even help boost the stoves effeciency using the fresh air warming feature.

 

[KodiakII]

Selkirk for the win! I have been running the "new" corn rated pipe for quite a few years now without even a spot of corrosion on it. The first series was another story, it rotted out in just a couple of years but was replaced (pro rated though) under warranty.

 

[SidecarFlip]

I've been running Simpson duravent pellet rated....on a corn and pellet mix and somethimes straight corn depending on market price for a decade now and other than the bottom cleanout cap getting wonky (and replaced), I've had no corrosion issues, but I take my vent apart every spring and wash it out inside with a pressure washer and soap so nothing lingers over the warm months.

A byproduct of corn is nitric acid vapor so without regular maintenance and shutdown cleaning, not only with the venting corrode, so will the stove itself. After a very through cleaning in the spring, I fog my stove with Stabil fogging oil inside, my SOP.

 

[BenA]

Thanks for the help. Sounds like I need to keep the pipe cleaner and give it a complete cleaning at the end of the season. The pipe I have is warranted for life so I got a new cap last year but it cost me $20 shipping.