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The Accuracy of Calculations, by ABZ, Inc.

<<With the widespread adoption of engineering software and computerized
design processes, it is commonly thought that engineering calculations are very accurate. However, while engineering software can eliminate mathematical errors and perform calculations with greater speed than hand calculations, there are many factors that must be acknowledged which can result in the calculated values being substantially different from actual measurements. This article will discuss some of the factors that can make calculations vary from measured results, including factors related to system construction as well as to system modeling. These factors can then be considered during system design to ensure that the design will meet all necessary requirements. In addition, consideration of these factors is also prudent when troubleshooting existing systems to avoid drawing unwarranted or incorrect conclusions.>>

Dynamic Susceptibility Method for Piping Vibration, by SST Systems, Inc.

<<When addressing vibration issues, the piping designer does not have
the specific requirements, nor the analytical tools and technical references typically available for other plant equipment such as rotating machinery. Typically, piping vibration problems only become apparent at the time of commissioning and early operation, after a fatigue failure or degradation of pipe supports. Discovery of a problem is then followed by an ad hoc effort to assess, diagnose and correct as required.>> Received on Thu Aug 26 11:29:00 2004