J.D.JOSE 17/11/2010 15:10:47 kiln retainer rings Dear allAnybody can tell about the LOGICS or principles used to fix retainer rings in kiln, based on its length , dia, and number of tires.ThanksJ.D.Jose. Michael Clark 07/12/2010 10:27:38 You would install a retainer ring to hold back the thrust of the refractory lining at the outlet or the end of any section where the diameter of the kiln changes.