1.1 本规程涵盖了一种技术，用于计算随时间收集并在储罐或容器中隔离的一批在线混合产品或工艺流材料的流量比例平均特性值（FPAPV），该技术使用在特性和流量的定期间隔进行的在线或在线测量的组合。 1.2 FPAPV方法使用定期收集的在线或在线过程分析仪测量值、流量和其他适当过程测量值或值的评估，根据生产材料的流量单位计算流量比例平均特性值。 1.3 当收集容器包含后跟（接收生产批次之前保留的材料）时，可以预先确定后跟材料的特性值和数量，并将其考虑到新批次的FPAPV计算中。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 如果合同或地方法规或两者都允许，根据本惯例计算的FPAPV可用于表示所收集材料数量的平均属性。 4.2 由于分析结果的平均值和适当加权，与基于少量样本分析的估计相比，所收集材料的FPAPV估计更具代表性和更精确。 注1: 对于在线分析仪系统结果以连续方式用于直接反馈控制的应用，具有基本相同FPAPV的大量批次的真实特性分布预计为高斯分布，以FPAPV值为中心，标准差不小于分析仪系统的长期现场精度标准差。 4.3 如果通过使用适当的相关方程，使用测量的特性值预测另一个特性值，则FPAPV也可以用作该特性的适当预测。 4.4 最新更新的FPAPV可用于表示储罐或容器中当前累积的材料的特性，以进行过程控制或材料处置决策，或两者兼而有之。

1.1 This practice covers a technique for calculating a flow-proportioned average property value (FPAPV) for a batch of in-line blended product or process stream material that is collected over time and isolated in a storage tank or vessel, using a combination of on-line or at-line measurements taken at regular intervals of the property and flow rates. 1.2 The FPAPV methodology uses regularly collected on- line or at-line process analyzer measurements, flow, and assessment of other appropriate process measurements or values, to calculate a flow-proportioned average property value in accordance with flow quantity units of material produced. 1.3 When the collecting vessel contains a heel (retained material prior to receipt of the production batch), both the property value and quantity of the heel material can be predetermined and factored into the calculation of the FPAPV for the new batch. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Contractual or local regulation, or both, permitting, the FPAPV calculated according to this practice can be used to represent the average property of the quantity of material collected. 4.2 Due to the averaging and appropriate weighting of analysis results, the FPAPV estimate of the property for the collected material is expected to be more representative and more precise than an estimate based on a small number of analyses on a few samples. Note 1: For applications where the on-line analyzer system result is being used in direct feedback control in a contiguous manner, the true property distribution for a large population of batches with essentially identical FPAPV's is expected to be Gaussian, centered at the FPAPV value, with a standard deviation that is no less than the long term site precision standard deviation of the analyzer system. 4.3 If the measured property value is used to predict another property value through the use of an appropriate correlation equation, the FPAPV can also be used as a suitable prediction of that property. 4.4 The most recently updated FPAPV can be used to represent the property of the material currently accumulated in the tank or vessel for process control or material disposition decisions, or both.