Originally Posted by thooper41
Only 4 holes letting the wort in? After reading John Palmers "How to brew" in pages 298-305 there is a good amount on fluid mechanics. If you dont want to get the book I would at least say try to build one like on the 2nd page on here How to Brew - By John Palmer - Appendix D - Building a Mash/Lauter Tun
Hard to explain but the problem with only having a few holes in your manifold is that it is going to suck in the wort directly above it rather than uniformly recirculation the wort there will be large gaps near the bottom that wont get recirculated then the areas directly above will get over circulated which is will take points off your efficiency.
Hope this helps
Those are just indicating dots as a legend. I'm going to do 1/8" perforations 1/3 thickness every 3/4".
Originally Posted by ScubaSteve
+1 to not sweating joints. You've probably got enough of a friction fit for a pretty solid manifold. I have a very similar design for my recirc manifold, and I really only sweated the main body.
I'd consider a union or compression sleeve+nut so you can easiloy unscrew the manifold after each brew. You will definitely need to get it out and clean it....rotted grain is NASTY.
That setup easily unscrews. I was only going to sweat those few joints so I can still clean it easily.
After some thought, I won't sweat the caps on to make it easier to blow out the legs. I just wanted to sweat together straight lengths to minimize the number of parts.