(HP-67/97) Pipe Corrosion prediction

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An extract from Computer Predicts Pipe Corrosion, Water & Sewage Works, v125 / n9, SEP 1978, pgs 78, 93-94, 96-98

"A computer program now exists for readily determining the corrosion of concrete pipe by hydrogen sulfide. It incorporates the author's 'life factor' to determine concrete-pipe design.
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PROGRAM DESCRIPTION
   The computer program boxed in at the top of pages 96 and 97 is written to operate interchangeably, on the Hewlett-Packard HP-67 pocket programmable calculator or on the HP-97 printing programmable calculator. The program utilizes the Pomeroy-Parkhurst 1977 prediction method with M' (specific sulfide flux coefficient) and N (empirical coefficient accounting for reaeration in partially filled lines) of 0.32 and 0.96 and the Az factor or 'life factor' method (Figure 3) of concrete pipe design.
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   The flowchart depicted in Figure 4 illustrates the method used to place a limit on the model with 'Z' and slope as previously indicated."
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The article is well documented with illustrations, charts, graphs, tables, etc., as well as annotated program listing / description, etc. …

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