Upgrading of existing ejector procedures and hardware is reviewed in Chapter 12. Chapter 11 reviews steam-jet refrigeration, steam-jet and gas-jet compressors, liquid jet eductors, desuperheaters, special design situations, and designing one's own more » systems. Part 4 on other ejector applications and upgrading ejector usage also consists of two chapters. Part 3, consisting of two chapters, is devoted to specifying and purchasing steam jet ejectors. The final chapter of Part 2 (Chapters 3-8) thoroughly covers all aspects of operation, testing, troubleshooting and maintenance. Chapter 7 is an excellent review of installation of ejector vacuum systems. The various types of pressure control are discussed in Chapter 6. In Chapter 5, contact and surface condensers are reviewed, and calculation procedures are presented. Engineering calculations for ejector stages is thoroughly discussed in Chapter 4. How ejector stages work is reviewed in Chapter 3. Chapter 2 discusses what an ejector is and how it works. Chapter 1 is a short overview on how to use the text. There are still many applications, however, such as those with large capacity requirements, where ejectors are the only equipment that can produce sufficient vacuum. With increasing emphasis on stricter pollution control, their use was curtailed. Steam jet ejectors were for many years the workhorse of the chemical process industries for producing vacuum.
