Chemical Processing - April 2008 - (Page 43) MAKING IT WORK < > 120 100 80 60 40 20 0 Loop health improvement ◆ ◆ i Tun ◆ ng ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ 8/24/2007 8/31/2007 9/7/2007 9/14/2007 9/21/2007 9/28/2007 10/5/2007 10/12/2007 10/19/2007 10/26/2007 11/2/2007 11/9/2007 11/16/2007 11/23/2007 11/30/2007 Figure 2. Tuning and valve repair significantly enhanced furnace temperature control. The payout from resolving these issues can be dramatic. At Porvoo, the PlantTriage software detected problems with the feed and dilution steam control valves on the cracking furnace. So, the maintenance schedule for these valves was accelerated. The furnace operation stabilized, reducing energy consumption. Figure 2, which charts a composite metric called Loop Health that is used to measure the overall effectiveness of the control loop, shows the impact of tuning and valve repair for the furnace temperature control. With better control, variability reduction resulted in better quality and capacity utilization. 12/7/2007 50% better e Valv rep air CONSTANT AND Accurate Control Systems. In some cases, overcoming valve problems requires only minor adjustments, such as recalibration of positioners or adjustments to valve air pressure. The undersized valves report identifies process constraints or bottlenecks. In some cases the constraint may be removed with relatively minor equipment changes. Oversized valves amplify mechanical, tuning and control design issues. Replacing valves or swapping out the valve trim greatly reduces these effects and brings the process back into control. Other improvements Process stability depends heavily on the performance of individual control loops. In the ethylene facility, temwww.chemicalprocessing.com Broad product lines provide solutions for virtually any project. Superior quality product surpassed only by the service and support. Strategically located Service Centers with factory-trained specialists. www.cashco www.cashco com Innovative Solutions http://www.concoa.com http://www.cashco.com http://www.chemicalprocessing.com
Table of Contents Feed for the Digital Edition of Chemical Processing - April 2008 Chemical Processing - April 2008 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor Is It a Tragedy or Comedy for Engineers? Better Understanding Boosts Mixer Scale-up Don't Err With Air Compressors Control Performance Supervision Enhances Revamp Process Puzzler Plant InSites Equipment & Services Product Spotlight/Classifieds Ad Index End Point Chemical Processing - April 2008 Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page Cover1) Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page Cover2) Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page 3) Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page 4) Chemical Processing - April 2008 - Contents (Page 5) Chemical Processing - April 2008 - Contents (Page 6) Chemical Processing - April 2008 - From the Editor (Page 7) Chemical Processing - April 2008 - From the Editor (Page 8) Chemical Processing - April 2008 - ChemicalProcessing.com (Page 9) Chemical Processing - April 2008 - ChemicalProcessing.com (Page 10) Chemical Processing - April 2008 - Field Notes (Page 11) Chemical Processing - April 2008 - Field Notes (Page 12) Chemical Processing - April 2008 - In Process (Page 13) Chemical Processing - April 2008 - In Process (Page 14) Chemical Processing - April 2008 - In Process (Page 15) Chemical Processing - April 2008 - In Process (Page 16) Chemical Processing - April 2008 - Energy Saver (Page 17) Chemical Processing - April 2008 - Energy Saver (Page 18) Chemical Processing - April 2008 - Compliance Advisor (Page 19) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 20) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 21) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 22) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 23) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 24) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 25) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 26) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 27) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 28) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 29) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 30) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 31) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 32) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 33) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 34) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 35) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 36) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 37) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 38) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 39) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 40) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 41) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 42) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 43) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 44) Chemical Processing - April 2008 - Process Puzzler (Page 45) Chemical Processing - April 2008 - Process Puzzler (Page 46) Chemical Processing - April 2008 - Process Puzzler (Page 47) Chemical Processing - April 2008 - Plant InSites (Page 48) Chemical Processing - April 2008 - Equipment & Services (Page 49) Chemical Processing - April 2008 - Equipment & Services (Page 50) Chemical Processing - April 2008 - Equipment & Services (Page 51) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 52) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 53) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 54) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 55) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 56) Chemical Processing - April 2008 - Ad Index (Page 57) Chemical Processing - April 2008 - End Point (Page 58) Chemical Processing - April 2008 - End Point (Page Cover3) Chemical Processing - April 2008 - End Point (Page Cover4)
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