ST has a nice program for Reels for Steel wire rope storage for :
Umbilical storage (Diving ind.)
Hose /Flexible line)s) handling.
Riser tubes ,Pipe Laying vsl.
Diameters from 2 up to 25 meter .
Rotary couplings and Slipring bodies can be mounted within the Reel-centre line.
Note : Power Sheaves 1,5 - 3 mtr.diameter.