ASTM D8003-15a(R2021) pdf free download
ASTM D8003-15a(R2021) pdf free download.Standard Test Method for Determination of Light Hydrocarbons and Cut Point Intervals in Live Crude Oils and Condensates by Gas Chromatography
1. Scope
1.1 This test method covers the determination of light hydrocarbons and cut point intervals by gas chromatography in live crude oils and condensates with VPCR 4 (see Note 1) up to 500 kPa at 37.8 °C. N OTE 1—As described in Test Method D6377. 1.2 Methane (C 1 ) to hexane (nC 6 ) and benzene are speciated and quantitated. Samples containing mass fractions of up to 0.5 % methane, 2.0 % ethane, 10 % propane, or 15 % isobu- tane may be analyzed. A mass fraction with a lower limit of 0.001 % exists for these compounds. 1.3 This test method may be used for the determination of cut point carbon fraction intervals (see 3.1.1) of live crude oils and condensates from initial boiling point (IBP) to 391 °C (nC 24 ). The nC 24 plus fraction is reported. 1.4 Dead oils or condensates sampled in accordance with 12.1 may also be analyzed. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5.1 Exception—Where there is no direct SI equivalent such as tubing size. 1.6 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 cut point carbon fraction interval, n—the percent mass obtained between two selected n-paraffins of the interval. The cut point carbon fraction interval as used in this test method is defined as the percent mass obtained between the end of one n-paraffin peak to the end of the next n-paraffin peak, thus a temperature interval is not used to determine the cut points but rather the end points sequential of a n-paraffin peak pair.3.1.2 D1265 cylinder, n—a container used for storage and transportation of a sample obtained at pressures above atmo- spheric pressure as described in Practice D1265. 3.1.3 dead crude oil, n—a term usually employed for crude oils that, when exposed to normal atmospheric pressure at room temperature, will not result in actual boiling of the sample. 3.1.3.1 Discussion—These crudes will have vapor pressures below atmospheric pressure at room temperature. 3.1.4 floating piston cylinder, n—a high pressure sample container, with a free floating internal piston that effectively divides the container into two separate compartments, as described in Practice D3700. 3.1.5 live crude oil, n—crude oil with sufficiently high vapor pressure that it would boil if exposed to normal atmospheric pressure at room temperature. 3.1.5.1 Discussion—Sampling and handling of live crude oils requires a pressurized sample system and pressurized sample containers to ensure sample integrity and prevent loss of volatile components. 3.1.6 residue, n—the percent mass of the sample that either does not elute from the column or elutes after the end of the nC 24 peak. 3.1.7 vapor pressure ofcrude oil (VPCR x ), n—the pressure exerted in an evacuated chamber at a vapor-liquid ratio of X:1 by conditioned or unconditioned crude oil, which may contain gas, air, or water, or a combination thereof, where X may vary from 4 to 0.02.
