A Financial Evaluation Applied to Selection of a Centrifugals

Asthe newmachines would beaddedto an existing station and four of the present ASEA machines would initiallybe retained for emergency standby, the question of providing N + 1 machines (the "1" beingstandby) did not arise. The largest available certrifuge would not have substituted entirely for the seven ASEAS and, with future planning in mind, it was decided to order two large machines. From all suppliers, the best capacity/cost ratio wasprovidedby their largest model and final tenders were therefore confined to these. One of the final tenderers could have achieved some commonality with the twoexisting DC driven 1 250kgmachines, but the advantages of their larger machine were considered to outweigh any benefits of commonality.