本修订标准自发布之日起生效，并取代本标准之前的所有修订版，包括APIMPMS11。2.2A/GPA TP-15。API对用于计算压力效应校正系数（Fp）的两种方法进行了标准化:MPMSC第11.2.1-1984章（现由第11.1-2004章和MPMSC第11.2.2-1986章取代）。这些方法需要了解测量条件下的平衡泡点压力（蒸汽压）。然而，通常不测量工艺液体的蒸汽压。蒸汽压也可以根据成分信息计算，但天然气液体（NGL）的成分并不总是测量的。 本文件提供了一个基于正常测量的NGL蒸汽压的简化关联式。

This revised standard is effective upon the date of publication and supersedes all previous revisions of the standard, including APIMPMS11.2.2A/GPA TP-15.Two methods used for calculation of the correction factor for pressure effects (Fp) were standardized by API:MPMSChapter 11.2.1-1984 (now superseded by Chapter 11.1-2004 andMPMSChapter 11.2.2-1986. These methods require a knowledge of the equilibrium bubble point pressure (vapor pressure) at the measured conditions. However, the vapor pressure of the process liquid is generally not measured. The vapor pressure can also be calculated from compositional information, but the composition is not always measured for natural gas liquids (NGLs). This document provides a simplified correlation for the vapor pressure of NGLs based upon normally measured.