.3:2026 采用热比重计法测定原油和液态石油产品的密度、相对密度和API比重的标准试验方法

This document covers the determination, using a glass thermohydrometer and/or a separate (alternative temperature measuring device in conjunction with a series of calculations, of the density, relative density, or API gravity of crude petroleum, petroleum products, or mixtures of petroleum and nonpetroleum products normally handled as liquids and having Reid vapor pressures (ASTM D323) of 101.325 kPa (14.696 psia) or less. Values are determined at existing temperatures and corrected to 15 °C (or 60 °F) by means of a series of calculations and international standard tables.