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Title: Use Of The Isam Program By Lone Star Gas Company In The Analysis Of Distribution Piping Systems
Author: Jimmy F. Gazzola
Source: American Gas Association 1977
Year Published: 1977
Abstract: In September, 1974, Lone Star Gas Company obtained a version of ISAM (Integrated System Analysis Model) from Arkansas- Louisiana Gas Company. This ISAM program was developed by Dr. M. A. Stoner, PH.D. who at the time was with Consumer Power Company of Jackson, Michigan, now of Stoner Associates, Inc., for the purpose of modeling gas piping systems in a steady state condition. The program, as obtained from Arkla, had to be modified to fit Lone Stars distribution system analysis requirements. Basically, it was necessary to convert from the original batch system input to an on line input/output timeshare computer terminal. further modifications were necessary to convert the flow and length units from those normally associated with transmission system analysis to distribution units, i.e. SMCFD miles to SMCFH - feet. In addition, the program was expanded to handle larger systems and to mathematically calculate specific ratios for all pipe segments. The specific ratio calculations permit easy location of system bottlenecks. Also, supplementary programs were developed to permit easier editing and filing of input data and to provide computer-drawn node diagrams.

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