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This paper describes how a natural gas transmission company improves operating efficiency and further increases its sales by the use of a process control computer, connected on-line to an existing telemetry system. The telemetry and instrumentation which is necessary for the on-line computer was installed as part of an overall automation program. Descriptions of the telemetry and instrumentation are included, together with a description of the computer system. The program and methods used to improve the operating economy by efficient utilization of the pipeline facilities are discussed. The existing on-line computer system has been operational since November, 1965.