WEAR CHARACTERISTICS OF PETROLEUM HYDRAULIC FLUIDS: D6973
EXPLANATION
This test method is an indicator of the wear characteristics of petroleum hydraulic fluids operating in a constant volume vane pump. Excessive wear in vane pumps could lead to malfunction of hydraulic systems in critical industrial or mobile hydraulic applications.
TEST SUMMARY
Hydraulic fluid in the amount of 190±4 L is circulated through a rotary vane pump system for 50 h at a pump speed of 2400±20 r/min, and a pump outlet pressure of 20.7±0.2 MPa. Fluid temperature at the pump inlet is 95±3 ° C. An ISO Grade 32 or 10W viscosity is required. The cam ring and all ten vanes are individually weighed before and after the test. The weight loss of the cam ring is reported with the combined weight loss of all ten vanes. The intra-vanes (inserts) are not part of the required weight loss measurements and should be separately measured, if desired. Other reported values are fluid cleanliness before and after the test, and initial and final flow rates. Prior to installing the hydraulic test fluid into the rig, a stand flush is required to remove any contaminants. A minimum of quantity of 190±4 L of fluid made of the same chemical formulation as the test fluid, is required for the stand flush. Therefore the total quantity of oil required for the test is 380 L.
TEST PRECISION
Work is underway to determine the repeatability, reproducibility, and bias of this test method.
