.2:2020 液体槽车数量核对

[中文适用范围]： 提供用于监测罐车液体数量盈亏（L/G）比率、液位及/或品质差异的方法与流程。本文件未确立行业通用的L/G比率或液位标准，但在正常工况下，该标准为识别各类罐车系统的L/G值提供指导。本文件有助于确定：—比率或液位偏差；—模式或趋势；—液体品质。此外，本文件还提供基于运行实践与统计学的工具，用于：—识别系统何时偏离正常运行状态；—指导识别导致系统偏离正常运行边界的根本原因。 [外文原描述]： 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.