ASTM D6892-03(R2020) pdf free download

ASTM D6892-03(R2020) pdf free download.Standard Test Method for Pour Point of Petroleum Products (Robotic Tilt Method)
1. Scope
1.1 This test method covers the determination of the pour point of petroleum products by an automatic instrument that tilts the test jar to detect movement of the surface of the test specimen with an optical device, after being removed from a regulated, stepped-bath cooling jacket. 1.2 This test method is designed to cover the range of temperatures from −57 °C to +51 °C; however, the range of temperatures included in the 1998 interlaboratory test program only covered the temperature range from −51 °C to −11 °C. 1.3 Test results from this test method can be determined at either 1 °C or 3 °C testing intervals. 1.4 This test method is not intended for use with crude oils. N OTE 1—The applicability of this test method on residual fuel samples has not been verified. For further information on the applicability, refer to 13.4. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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 pour point, n—in petroleum products, the lowest temperature at which movement of the test specimen is observed under prescribed conditions of test. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 no-flow point, n—in petroleum products, the tempera- ture of the test specimen at which a wax crystal structure or viscosity increase, or both, impedes movement of the surface of the test specimen under the conditions of the test. 3.2.1.1 Discussion—The no-flow point occurs when, upon cooling, the formation of wax crystal structures or viscosity increase, or both, has progressed to the point where the applied observation device no longer detects movement under the conditions of the test. The preceding observation temperature at which flow of the test specimen is last observed is the pour point. 3.2.2 tilting, vt—technique of movement where the test jar in a vertical position is moved towards a horizontal position to induce specimen movement. 3.2.2.1 Discussion—When the test jar is tilted and held in a horizontal position for 5 s without detection of movement of the surface of the specimen, this is the no-flow point and the test is complete.
4. Summary of Test Method
4.1 After insertion of the specimen into the automatic pour point apparatus and initiation of the testing program, the specimen is heated and then cooled according to a prescribed profile. The specimen surface is examined periodically for movement using an optical camera system mounted on top of the specimen test jar, while tilting the specimen test jar. The test jar is removed from the jacketed cooling chamber prior to each examination. The lowest temperature, when movement of the surface of the specimen is detected, is recorded as the pour point determined by this Test Method D6892.
5. Significance and Use
5.1 The pour point of a petroleum product is an index of the lowest temperature of its utility for certain applications. Flow characteristics, such as pour point, can be critical for the correct operation of lubricating systems, fuel systems, and pipeline operations. 5.2 Petroleum blending operations require precise measure- ment of the pour point. 5.3 Test results from this test method can be determined at either 1 °C or 3 °C intervals. 5.4 This test method yields a pour point in a format similar to Test Method D97 or IP 15, when the 3 °C interval results are reported. N OTE 2—Since some users may wish to report their results in a format similar to Test Method D97 or IP 15 (in 3 °C intervals) the precision data were derived for the 3 °C intervals. For statements on bias relative to Test Method D97 or IP 15, see the research report. 5.5 This test method has comparable repeatability and better reproducibility relative to Test Method D97 or IP 15 as measured in the 1998 interlaboratory program (see Section 13).