ASTM D2271 Test Method for Preliminary Examination of Hydraulic Fluids (Wear Test)
3. Summary of Test Method
3.1 A hydraulic fluid is circulated through a rotary vane pump system for 1000 h at a pump speed of 1200 +/- 60 r/min and a pump outlet pressure of 6.90 +/- 0.14 MPa (1000 +/- 20 psig). Fluid temperature at the pump inlet is 66 +/- 3°C (150 +/- 5°F) for all water glycols, emulsions, and other water-containing fluids and for petroleum and synthetic fluids with 40°C (104°F) viscosities of 46 mm2/s (213 SUS) or less. A temperature of 79°C (175°F) is used for all other synthetic and petroleum fluids. The result obtained is the total cam ring and vane weight losses during the test.
3.2 Fluid Volume - The volume of fluid in the test system shall not be limited but shall be as small as practical in order that the period required for a complete fluid-cycle through the pump, equal to
T = V/P
where:
T = recirculation time, min,
V = total volume, liters (gal), and
P = pump delivery, liters/min (gal/min) (shall be not less than 1 nor more than 1.5 min under operating conditions).
4. Significance and Use
4.1 The weight loss obtained from the use of this test method is an indicator of the wear preventative characteristics of petroleum and non-petroleum hydraulic fluids operating in a constant volume vane pump. Excessive wear in vane pumps can lead to malfunction of hydraulic systems in critical applications.
