Multi-stage SJE system

Retrofit strategy and procedure for minimizing the operating cost of multi-stage SJE, LRVP, DVP, SJE-LRVP and SJE-DVP systems are discussed in this section. They are illustrated with two case studies in the subsequent sections. There are several ways to reduce the energy cost or increase capacity of a vacuum system. Engineers often find it difficult to make correct revamp decisions as most of the information is vendor specific. This chapter illustrates the use of simple techniques, based on available literature, to revamp a vacuum system easily and quickly. 

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