API MPMS Chapter 23.2

Provide methodologies and processes to monitor liquid tank car movements’ quantity loss/gain (L/G) ratios, level, and/or quality differences for tank car measurement systems. This document does not establish an industry standard for L/G ratios or level, but under normal operating conditions the standard will assist the user to identify L/G of any tank car system. It will assist to determine:

• ratio or level deviations,
• patterns or trends,
• liquid quality.

This document will also make available operational and statistically based tools to:

• identify when a system exhibits a deviation from its normal operating conditions,
• guidelines for identifying the causes of the deviation from its normal operating perimeters.