Compressed Air Best Practices - June 2008 - (Page 29) Focus Industry PHARMACEUTICALS | 06–07/08 | p The inlet valve can partially close and operate with the blow off or recirculation valve and run at idle 25–35% power draw with no flow to the plant. To be effective, this type capacity control is storage dependent Typical 3-Stage Centrifugal 2,500 scfm Class at 125 psig Effect of inlet temperature and other ambient conditions on performance and turndown AVERAGE WINTER EXTREME WINTER AVERAGE SUMMER EXTREME SUMMER Max. icfm Max. scfm Min. icfm 2810 2871 1695 1729/TD 41% 638 2830 3224 1504 1711/TD 47% 680 2805 2612 1844 1715/TD 34.3% 600 2810 2422 2004 1726/TD 29% 573 The more turndown available, the more flexible the unit is to meet varying demand profiles efficiently. Max. scfm/TD Max. BHP at FL scfm The above table reflects the particular data from a 2,500 cfm class, 125 psig, three-stage compressor and its performance and turndown calculated limits at various times of the year operating in the Midwestern part of the United States. The scfm rating reflects the relative density of the air. There are various elements all acting to establish that limitation: p p p p p Effect of ambient temperature Effect of ambient pressure Limiting pounds per minute flow not overloading the motor Cooling water temperatures Limited maximum flow volume of inlet cubic feet per minute of ambient air The three curves above compare operating characteristics with pressure and flow, including changes in surge point and horsepower requirements without a controlling device in the inlet and discharge Inlet Guide Vanes (IGV) are much improved and relatively easy and economical to add to most existing units. Inlet guide vanes do not increase turndown, but they do allow the unit to operate throughout the turndown range at or near full load efficiency. By smoothing out the inherent turbulence of a normal inlet butterfly valve, the IGV makes it much easier to set the turndown controls closer to the surge line. www.airbestpractices.com 29 http://www.dekkervacuum.com http://www.dekkervacuum.com http://www.airbestpractices.com
Table of Contents Feed for the Digital Edition of Compressed Air Best Practices - June 2008 Compressed Air Best Practices - June 2008 Contents From the Editor Utility-Air News A Pharmaceutical Compressed Air System Audit Talking Dew Point Puerto Rico, Pharmaceuticals and Airequipo Inc. Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison SMC: Managing Energy and Dew Point in Pneumatic Systems Utility Grade Compressed Air Systems Training Calendar & Product Picks Wall Street Watch Advertiser Index Job Market Compressed Air Best Practices - June 2008 Compressed Air Best Practices - June 2008 - (Page Intro) Compressed Air Best Practices - June 2008 - Compressed Air Best Practices - June 2008 (Page Cover1) Compressed Air Best Practices - June 2008 - Compressed Air Best Practices - June 2008 (Page Cover2) Compressed Air Best Practices - June 2008 - Compressed Air Best Practices - June 2008 (Page 3) Compressed Air Best Practices - June 2008 - Contents (Page 4) Compressed Air Best Practices - June 2008 - Contents (Page 5) Compressed Air Best Practices - June 2008 - From the Editor (Page 6) Compressed Air Best Practices - June 2008 - From the Editor (Page 7) Compressed Air Best Practices - June 2008 - Utility-Air News (Page 8) Compressed Air Best Practices - June 2008 - Utility-Air News (Page 9) Compressed Air Best Practices - June 2008 - Utility-Air News (Page 10) Compressed Air Best Practices - June 2008 - A Pharmaceutical Compressed Air System Audit (Page 11) Compressed Air Best Practices - June 2008 - A Pharmaceutical Compressed Air System Audit (Page 12) Compressed Air Best Practices - June 2008 - A Pharmaceutical Compressed Air System Audit (Page 13) Compressed Air Best Practices - June 2008 - A Pharmaceutical Compressed Air System Audit (Page 14) Compressed Air Best Practices - June 2008 - A Pharmaceutical Compressed Air System Audit (Page 15) Compressed Air Best Practices - June 2008 - A Pharmaceutical Compressed Air System Audit (Page 16) Compressed Air Best Practices - June 2008 - Talking Dew Point (Page 17) Compressed Air Best Practices - June 2008 - Talking Dew Point (Page 18) Compressed Air Best Practices - June 2008 - Talking Dew Point (Page 19) Compressed Air Best Practices - June 2008 - Puerto Rico, Pharmaceuticals and Airequipo Inc. (Page 20) Compressed Air Best Practices - June 2008 - Puerto Rico, Pharmaceuticals and Airequipo Inc. (Page 21) Compressed Air Best Practices - June 2008 - Puerto Rico, Pharmaceuticals and Airequipo Inc. (Page 22) Compressed Air Best Practices - June 2008 - Puerto Rico, Pharmaceuticals and Airequipo Inc. (Page 23) Compressed Air Best Practices - June 2008 - Puerto Rico, Pharmaceuticals and Airequipo Inc. (Page 24) Compressed Air Best Practices - June 2008 - Puerto Rico, Pharmaceuticals and Airequipo Inc. (Page 25) Compressed Air Best Practices - June 2008 - Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison (Page 26) Compressed Air Best Practices - June 2008 - Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison (Page 27) Compressed Air Best Practices - June 2008 - Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison (Page 28) Compressed Air Best Practices - June 2008 - Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison (Page 29) Compressed Air Best Practices - June 2008 - Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison (Page 30) Compressed Air Best Practices - June 2008 - Oil-Free Rotary and Oil-Free Centrifugal Compressor Comparison (Page 31) Compressed Air Best Practices - June 2008 - SMC: Managing Energy and Dew Point in Pneumatic Systems (Page 32) Compressed Air Best Practices - June 2008 - SMC: Managing Energy and Dew Point in Pneumatic Systems (Page 33) Compressed Air Best Practices - June 2008 - SMC: Managing Energy and Dew Point in Pneumatic Systems (Page 34) Compressed Air Best Practices - June 2008 - SMC: Managing Energy and Dew Point in Pneumatic Systems (Page 35) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 36) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 37) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 38) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 39) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 40) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 41) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 42) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 43) Compressed Air Best Practices - June 2008 - Utility Grade Compressed Air Systems (Page 44) Compressed Air Best Practices - June 2008 - Training Calendar & Product Picks (Page 45) Compressed Air Best Practices - June 2008 - Training Calendar & Product Picks (Page 46) Compressed Air Best Practices - June 2008 - Wall Street Watch (Page 47) Compressed Air Best Practices - June 2008 - Wall Street Watch (Page 48) Compressed Air Best Practices - June 2008 - Advertiser Index (Page 49) Compressed Air Best Practices - June 2008 - Job Market (Page 50) Compressed Air Best Practices - June 2008 - Job Market (Page Cover3) Compressed Air Best Practices - June 2008 - Job Market (Page Cover4)
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