Development of Analytical Methods for Predicting Damage Functions for PittingCorrosion in Condensing Heat Exchangers. Final Technical Report, June 1989-July 1993

摘要

An algorithm has been developed to predict pitting corrosion damage functions forcondensing heat exchanger in gas-fired furnaces that may be used by design engineers to specify the most cost-effective materials of fabrication. The algorithm, called PITPREDICTOR, consists of five modules: a Condensate Chemistry Module for estimating chemistry parameters in the condensate; a Mixed Potential Module for calculating the corrosion potential of the tube alloy; a Pit Growth Module for calculating the growth rate of an individual pit; a Pit Nucleation Module for estimating the rate of nucleation of new pits, and a Damage Function Module which combines the outputs of the pit nucleation module and of the pit growth module to yield the damage functions (a graphic presentation of the number of pits versus the depth of pits in the form of histogram).