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UniSim Design (Release R380) now provides users with access to Predict-SW (Release Version 2.0) through the UniSim Design interface. This document will provide users with a brief background on Predict-SW and information needed to utilize it. Predict-SW is a user-friendly software system, which incorporates comprehensive data obtained in a joint industry sponsored program conducted by Honeywell International Inc.
between March 2000 and February 2003 entitled "Prediction and Assessment of Ammonium Bi-sulfide Corrosion under Refinery Sour Water Service Conditions". Data from this program, combined with flow modeling calculations on plant tubing/piping configurations are used to predict the corrosion rates of the fourteen materials studied over a wide range of NH4HS concentration, H2S partial pressure, temperature, hydrocarbon content and chemical treatment.
Within UniSim Design, Predict-SW can be launched as a Thermo Utility and stream data can be transferred to Predict-SW and the results from Predict-SW are sent back to UniSim Design. The following sections are used to illustrate how users can attach the Predict-SW utility to a particular stream and get corrosion rate predictions from UniSim Design. Some details on Predict-SW program limitations are also presented.
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