API MPMS 11.3.2.1: 2012 Draft. Ethylene Density

American Petroleum Institute (API). Second Edition, Ballot Draft July 2012. 6 p. This standard identifies equations of state (EOS) suitable for use in custody transfer measurement of pure ethylene (>99 %) in the gaseous, liquid, and super critical phases. Given flowing temperature and pressure, each equation of state identified in this document is capable of calculating density, and other thermodynamic properties used to calculate mass and volumetric flow of ethylene to custody transfer accuracy. All accuracy and uncertainty statements in this standard are limited to the equation of state results, and do not include the uncertainty added by the primary and secondary measuring equipment.