Blair multi-r ope hoist 6 The conventional double drum hoist underwent a major development in 1957 when Robert Blair intr oduced the concept of combining the load carrying capacity of multiple r opes in the friction hoist system with the simplicity and fexibility of drum hoists. Each drum of a BMR hoist is divided into two (or mor e) compart - ments with a single r ope per compart - ment - each r ope on the drum being attached to the same conveyance. Systems ar e incorporated to ensur e load sharing between r opes and pr otection against miscoiling. The BMR system signifcantly incr eases the hoisting capacity of a drum hoist. Hoists with end loads of 32 tonnes at depths of 2500 meters ar e common. The Moab Khotsong BMR winder , supplied by FLSmidth to Anglogold V aal River Operations, was the frst hoist to operate to a depth of 3150 m in a single wind with an end-load of 23 tonnes. The most fr equently encounter ed pr oblem with a BMR hoisting system is that of Fleet angle contr ol because of the wide drums inher ent in BMR hoists. A number of solutions ar e employed. • Arranging the drums in tandem and mechanically coupling thr ough gears; • Arranging the drums in tandem, or side by side, but inclined at an angle, and coupling electrically . • In-line arrangement of drums wher e the shaft system allows for conveyances at large centr e distances, for example using the outer compartments of a shaft. • Arranging the drums inclined to each other , but mechanically coupled thr ough a Hookes Joint. FLSmidth of fers a compr ehensive range of services to their pr oducts and clients.