Hello Dwight,
If there is a possibility that a byproduct can re-enter the (human) food supply, then Yes for full CIP.
For spent grains loadout to other uses, Hot Water to internal spray nozzles is appropriate for periodic rinsing & sterilization procedures, per the site-specific FSHC & HACCP program.
Hard-piped rinse water supply is beneficial when preparing for maintenance work on the tank outlet gate, instruments, manway seal, etc.
In St. Louis we learned the hard way,
the Spent Grains tank must be insulated, and the pipelines to it must be heat traced and insulated.
It's not if the tank will get overfilled (or transfer line clogged, or hauler's truck fails to arrive, etc.), only when....and most likely that is during -10F January conditions.
For seldom-used water piping to tank sprays, the need for insulation is less than the requirement for it to be fully drained between uses.
Environmental aspects also merit attention during design: When the tank is rinsed, or an unplanned loadout spill occurs, have a plan for solids containment, and prevent entry into storm drains.
Have a successful project -
David Ammons, PE