Word of Warning on Thumpers

[SmokyMtn]

I've been actively stilling for a few years now. But only recently experienced the enjoyment of running a thumper. My recently built all copper still included a thumper made from 20 oz copper sheeting. The top has a 4 inch fill port and the obvious in and out for vapor. Completely flat across the top.

During my cleaning runs yesterday I was quite surprised by how loud the top sheet of copper was sounding off. With its name "thumper" I expected some light bubbling sounds. Maybe something so soft you would have to put your ear close to even pick up. WRONG! Think sticks and metal trash can, given to a drummer.

I only share this for people planning on building, and have neighbors nearby. Building out of thinner gauge copper sheets is not going to be stealthy. Luckily I live in a remote area.

Thumper sound and audible detection isn't mentioned much here. When you're planning a build, think of nosy Nancy next door.