I have mine all tested (with water) and ready to go. Waiting until next week when my father-in-law visits to give it its first brew using the new setup. He's helped me before, but this setup will be new to both of us.
I added a valve, sightglass and thermometer to my keggle. Got a pump, silicone tubing and QDs. Added a PVC manifold to the top of my 70qt coleman extreme. Built a 20'
CFC/pump-in-a-bucket ala jkarp. A lot of new stuff.
My recirc flow rate is about 1 gpm. Not great, but faster than the MLT drains into the BK so I'll still have to throttle it back during mash recirculating.
My first brew using this setup will be a 5 gallon batch (I normally do 10 gallon batches unless I'm trying a new recipe) and I'm trying to determine my mash water/BK water ratio for recirc. I need about 4 gallons in the BK to get a good reading from the thermometer. There is approx. 0.33 gal of dead space in the whole setup (1.75 cups in BK, the rest in the CFC/Pump/hoses/MLT).
For 10.25 lbs of grain, I'll need 8.87 gallons water total, so I'm thinking a 50/50 split between MLT and BK. That would be 4.43 gal to the MLT for a water/grain ratio of 1.73 qts/lb.
Lots of new variables to take into account.
For 10 gallons batches using 15 lbs of grain or more, my total water volume required will be greater than the capacity of the keggle and I'll probably have to transfer all mash water to the MLT and mash for a bit without recirc while the additional water is heating in the BK. We'll see how it goes.
I'll take some pics when I brew.
Many thanks to Sacc and jkarp.