This publication focuses on the design, implementation, testing and operation of CPM (or software-based leak detection) systems that use an algorithmic approach to detect hydraulic anomalies in pipeline operating parameters. The primary purpose of these systems is to provide tools that assist pipeline controllers in detecting commodity releases that are within the sensitivity of the algorithm. It is intended that the CPM system would provide an alarm and display other related data to the pipeline controllers to aid in decision-making. The pipeline controllers would undertake an immediate investigation, confirm the reason for the alarm and initiate an operational response to the hydraulic anomaly when it represents an operational upset or commodity release. The purpose of this publication is to assist the pipeline operator in identifying issues relevant to the selection, implementation, testing, and operation of a CPM system. This document may be used in conjunction with other API publications (API Publications 1149 and 1155) and any applicable regulationsThe 2002, Second Edition of API 1130 incorporates comments from the pipeline industry, software vendors and system integrators, based on their experience from use of API Std 1130, First Edition, October 1995.