How safe is the "Copper Fire Log Heater: Burns clean with alcohol!" project?

The Instructable itself seems fairly risk free; however, I noticed one comment stating that it could potentially become a big problem (the internal gases build up and you get a pipe bomb...). I have no problem operating the equipment necessary to create it, but I would like to know of any hazards of the product - besides general fire safety.

Here is a the link:

https://www.instructables.com/id/Copper_Fire_Log_Heater_Burns_clean_with_alcohol/

Thank you for any amount of the time that you spend answering this question!

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how long will the flame last on one filling?
orksecurity8 years ago
I'd add to Seandog's point the observation that it's closed with a cork. If it somehow did get into trouble, I'd bet that it'd blow the cork out before doing anything else.
TheBeginning (author)  orksecurity8 years ago
That is a really good point! In fact, in its own way, it's similar to a safety release valve. Thanks for pointing that out!
TheBeginning (author) 8 years ago
Thank you for your concern, and thank you so very much for your ideas.
good luck! :)
TheBeginning (author)  seandogue8 years ago
Just one more question... I was considering creating this project using a brass tube instead of the copper one (for purely aesthetic reasons), but I was unable to determine two things: how brass conducts the heat transfer (not necessarily that important) and how/if the brass would tarnish over time. Any ideas?
TheBeginning (author) 8 years ago
Thank you so much for your input! I was just worried that this project could turn into a nightmare... Just to confirm, you don't think that the gases involved are a problem? Based on my experiences, I do not think that this would become a hazard, but it's always nice to check.