A cast-off replacement policy for a component demanded by two parallel units

Sometimes a component is removed and thrown away from a unit when it is not working satisfactorily: this could be wasteful in many cases. Some components after removal from a unit may work satisfactorily in another less demanding parallel unit, for a reasonable length of time. Therefore, in this paper we present a cast-off replacement policy that makes maximum utilization of a component that is non-repairable and demanded by two parallel units. A minimum total cost objective function is assumed.