I made way too much of this stuff at another brewery as a Razz was our best seller, and recently made a batch here.
Primary ferment for 3-4 days then add the fruit to the PRV port. If you get Oragon Fruit the mouth of the bag should fit nicely in the port. Yes, this means climbing a ladder you 'Girly Boy'! It will put a little thrill into your day. :-) We did it all the time w/ 30bbl fermentors.
Dont add it to the server. You WILL get a seconday fermentaion from the sugar in the fruit. Then you can draw off alot of the pulp w/ the yeast. Dont expect to re-pitch of course!
IMPORTANT add pectic enzyme with the fruit- this helps with the filtering issue.
Also dont try for bright beer- filter 7-5mc at the tightest or do a 2 stage filtration. Finnings in the tank might help too but I add a extra week to fermentaion for natural settling. I wouldnt try to just run it into the server and hope not to get chunks!!
At 4 bags, 176 pounds, for a 10 bbl batch you will get a INTENSE fruit character w/ a red hue and Pink Head (raspberry) 2 bags per 10 bbls is more the norm. If you want more flavor you can add the extraxt to the server.
Last, after buying that fruit this will probably be the most expensive beer you make!!