« on: June 21, 2011, 08:05:35 AM »
I've decided to build a bigger fermenter and I have a couple questions. In particular, does the diameter of the vessel matter? I know if it was a pot it would impact boil-off rates but in a closed fermenter, does it matter if the fermenter is tall and skinny or narrow and wide?
I'm looking to build something of about 15 to 20 gal capacity and we've ordered a 4X8 sheet of stainless to get started. But, the dimension is clearly one of the key points to consider before we start cutting anything.
I'm lucky that I have a good friend who has a machine shop and is slow right now so we are going to have the steel rolled to dimension and then a seam welded. He has a very good TIG welder on staff so I'm not that concerned about the weld as it will be done well and ground. We're also looking at having a cone rolled for the bottom and welded.
The other consideration was, would it make any sense to have the entire fermenter made conical? Instead of having straight sides attached to a cone, would it make sense to have it all as a cone and weld wedges on the exterior to bolt legs to. The lid will likely be formed with an o-ring groove and clamps to hold it in place. Any other thoughts? I've looked at some on-line and I don't know if I like how the lid attaches on some of them.
Thanks for the advice.