ASTM D7156 Standard Test Method for Evaluation of Diesel Engine Oils in the T-11 Exhaust Gas Recirculation Diesel Engine
12. Report
12.1 Reporting Reference Oil Test Results:
12.1.1 For reference oil tests, the standardized report form set and data dictionary for reporting test results and for summarizing operational data are required. Report forms and the Data Dictionary are available from the TMC. Fill out the report forms in accordance with the formats shown in the Data Dictionary. When transmitting data electronically, a Header Data Dictionary shall precede the Data Dictionary. The latest version of this Header Data Dictionary can be obtained from the TMC either by FTP (Internet) or by calling the Test Engineer responsible for this particular test. Round the data in accordance with Practice E29.
12.1.2 During the test, ifthe engine is shut down or operated out of test limits, record the test hours, time, and date on the appropriate form. In addition, note in the comment section all prior reference oil tests that were deemed operationally or statistically invalid.
12.1.3 When reporting reference oil test results, transmit the test data electronically by utilizing the ASTM Data Communications Committee Test Report Transmission Model, which is available from the TMC. Transmit the data within five working days of test completion.
12.2 Deviations from Test Operational Limits - Report all deviations from specified test operational limits.
13. Precision and Bias
13.1 Precision:
13.1.1 Test precision is established on the basis of operationally valid reference oil test results monitored by the TMC.
13.1.1.1 Intermediate Precision Conditions - conditions where test results are obtained with the same test method using the same oil, with changing conditions such as operators, measuring equipment, test stands, test engines, and time.
NOTE 3 - Intermediate precision is the appropriate term for this test method rather than repeatability, which defines more rigorous within-laboratory conditions.
13.1.1.2 Intermediate Precision Limit (i.p.) - the difference between two results obtained under intermediate precision conditions that would in the long run, in the normal and correct conduct of the test method, exceed the values shown in Table 4 in only one case in twenty.
13.1.1.3 Reproducibility Conditions - conditions where test results are obtained with the same test method using the same test oil in different laboratories with different operators using different equipment.
13.1.1.4 Reproducibility Limit (R) - the difference between two results obtained under reproducibility conditions that would, in the long run, in the normal and correct conduct of the test method, exceed the values shown in Table 4 in only one case in twenty.
13.1.2 Test precision, as of May 3,2004 is shown in Table 4.
13.1.3 The TMC will be able to update precision data as it becomes available.
13.2 Bias - Bias determined by applying an accepted statistical technique to reference oil test results and when a significant bias is determined, a severity adjustment is permitted for non-reference oil test results, see 11.8.
14. Keywords
14.1 diesel engine oil; exhaust gas recirculation; lubricants; soot; T-11 diesel engine; viscosity
