By Theodore Gresh
This e-book should be preferred as a convenient reference e-book via compressor layout engineers and compressor upkeep engineers in addition to engineering scholars. As its identify indicates, this ebook covers the whole spectrum of data wanted for someone to pick, function, attempt and preserve axial or centrifugal compressors. It comprises a few simple aerodynamic thought to supply the consumer with the "how's" and "why's" of compressor layout. upkeep Engineers specifically will take pleasure in the troubleshooting guidance provided. the numerous instance difficulties and the reference information similar to gasoline homes and movement meter calculations will let effortless research of compressor functionality in perform. a working laptop or computer application is additionally provided to be able to increase the worth of the booklet and the years of craftsmanship and event therein.M. Theodore Gresh has been with the Elliot corporation in Jeannette, Pennsylvania, for the reason that 1975, first and foremost engaged on the mechanical and aerodynamic layout and alertness of centrifugal compressors.
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Extra info for Compressor Performance: Aerodynamics for the User
As an example, we know the sonic velocity of air at 80~ is 1140 fps, and that of propylene at - 40~ is 740 fps. 12. Diffuser vanes. ) *Adapted from "Centrifugal Compressors... C. Hallock, Elliott Company, Jeannette, PA, 1968, with permission [ 17]. 14. Effect of varying inlet conditions at constant speed for a single-stage compressor. For a multi-stage compressor, the curve shape and operating range is further compounded by volume ratio effects. 16. ) e3 Head ~ Stage 2 N4 Discharge pressure ~ !
This is true for all compressors, even "off the shelf" varieties. Although the design may be proven, parts can be mismachined or improperly assembled. Custom-built compressors have the added risk of errors in application or design engineering. ASME Power Test Code (PTC10-1997) has defined two types of performance tests: Type 1. This is a test run on the design gas near design *Adapted from "Compressor Refresher," Elliott Company, Jeannette, PA, 1975, with permission [ 11]. plus 2% if a gear is involved.
One user of a compressor noted the following data before and after a balance piston seal replacement. This machine was in refrigeration service and was required to maintain a constant discharge pressure. 5 10770 165 The balance piston damage was a result of surging and vibration excursions. The interstage seals were also extensively damaged, which contributed to the poor compressor efficiency. Note the differences in the various data for before and after the seal replacement. The discharge temperature was high, since more work input was required to achieve the desired discharge pressure.