API STD 2560-2003 (R2010)

2.1 This publication provides methodologies for monitoring liquid pipeline loss/gain, and for determining the normal loss/gain level for any given pipeline system. Troubleshooting suggestions are also presented.

2.2 This document does not establish industry standards for loss/gain level because each system is an individual and exhibits its own loss/gain level and/or patterns under normal operating conditions.

2.3 The document provides operational and statistically based tools for identifying when a system has deviated from normal, the magnitude of the deviation, and guidelines for identifying the causes of deviation from normal.