ASTM D6681 Standard Test Method for Evaluation of Engine Oils in a High Speed, Single-Cylinder Diesel Engine - Caterpillar 1P Test Procedure
13. Report
13.1 Forms and Data Dictionary - For reference oil tests, the standardized report forms and data dictionary for reporting test results and for summarizing the operational data are required. All report forms making up the 1P final report are available at the TMC website (http://www.dgaequipment.com). Report values for all the field names listed in the report forms. Some fields might be blank for short-term tests. Report all deposits, wear, and engine operational data as shown in the test report. The data dictionary defines the field lengths, decimal size, data type, units and format for the field names listed in the test report forms.
13.2 Test Validity Reporting - Mark whether the test is Valid, Invalid, or Non-interpretable where indicated in the test report. For a valid stand calibration run, report the test data to the TMC, and its engineers shall include the test data in the operationally valid database and determine statistical validity using the LTMS method. The LTMS method tracks the severity and precision of stand and laboratory test results. For a complete definition, refer to the LTMS manual that is available from the ASTM Test Monitoring Center. For an invalid or non-interpretable stand calibration run, report the test data to the TMC with comments describing why the test is considered invalid or non-interpretable; the TMC shall not include these test data in the operationally valid database. All operationally invalid and non-interpretable calibration tests are reported by the TMC to the ASTM Single Cylinder Diesel Surveillance Panel in periodic testing summaries.
NOTE 1 - For a valid ACC Registered Oil Test, report the data to the registration organization. For an invalid or non-interpretable ACC Registered Oil Test, report the test data to the registration organization with supporting comments describing why the test is considered invalid or non-interpretable. When tests are presented to Caterpillar for review, include the data from all tests that were registered with the registration organization as part of the program.
13.3 Report Specifics:
13.3.1 If more than one fuel batch is used, report the fuel batch analysis that is most representative of the fuel in the tank.
13.3.2 Report any causes for any missing or bad test data in the comment section of the Downtime Summary form. If any alternative data acquisition method is used, document it as well.
13.3.3 If a calibration period is extended beyond the normal nine-month period, make a note in the comment section of the Downtime Summary form and attach a written confirmation from the TMC to the test report. List the outcomes of previous calibration runs in the comment section of the Downtime Summary form.
13.3.4 Attach to the test report the fuel analysis provided by the fuel supplier. For calibration tests, attach a copy of the TMC control chart analysis.
NOTE 2 - It is recommended that test purchasers include the form shown in Fig.X1.8 when presenting the test results against specification limits, such as those in Specification D4485 or military specifications.
14. Precision and Bias
14.1 Test precision is established on the basis of reference oil test results (for operationally valid tests) monitored by the ASTM Test Monitoring Center. The data are reviewed semiannually by the Single-Cylinder Diesel Surveillance Panel. Contact the ASTM TMC for current industry data.
14.1.1 Table 1 summarizes reference oil intermediate precision and reproducibility of the test. The tabulated values are current as of Feb.1, 2005. The Surveillance Panel updates these values as necessary.
14.1.2 Intermediate Precision Conditions - Conditions where test results are obtained with the same test method using the same test 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.
14.1.2.1 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 1 in only one case in twenty. When only a single test result is available, the Intermediate Precision Limit can be used to calculate a range (test result +/- Intermediate Precision Limit) outside of which a second test result would be expected to fall about one time in twenty.
14.1.3 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.
14.1.3.1 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 1 in only one case in twenty. When only a single test result is available, the Reproducibility Limit can be used to calculate a range (test result +/- Reproducibility Limit) outside of which a second test result would be expected to fall about one time in twenty.
14.1.4 Bias - Bias is determined by applying an acceptable 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 TMC Memo 94-200, Lubricant Test Monitoring System document for details).
15. Keywords
15.1 caterpillar 1P test procedure; oil consumption; piston deposits; single cylinder oil test
