Location
Making the water sump framework
I used to call this sump the “hot water sump”, but that’s misleading, because the water in the sump is not heated per se (that is, in the sump itself); rather, it is only heated just before it is pumped through the digester and into the HEx (heat exchange) units, saving energy. So now, at least for this moment, I'm calling this assembly the “water sump”.
The whole sump is actually a polypanel container, so of course it has wood on the inside, mated to wood on the outside, capturing polysty panels between. This post is about manufacturing the inside framework for the sump.
The first step is to cut the wood as specified in the parts list (an Excel spreadsheet), and/or according to what is found in the set of SPN labels. Both spreadsheet and labels are of course provided with the drawing set.
Jig up the boards that make the sump framework bottom square and screw things together.
Same thing for the sump framework top square.
The jigging used to attach on the “risers”, the “legs” of the sump framework on to the top square is a bit more complex; but basically, like all jigging, it is intended to hold the risers in the exact place where they will end up, as they are being screwed together.
Then the bottom square is jigged on to the top square and risers, and the whole thing is strongly screwed together. The float valve support is also put on at this point.
The sump framework on the digester’s right-side “porch”. You can see the float valve support on the right-hand side of the framework.
Finally I’ve gathered all of the polysty that will be put on the outside of this framework (plus some polysty parts that help insulate parts of the panel right), in preparation for taking the next construction steps to make a more complete sump.