One of the major measures of the ability of the turbine oils to work effectively during longer service periods is the oxidation stability of the turbine oils. ASTM D2272 is a standard procedure that employs a rotating pressure vessel (RPVOT) to determine the duration of time that the oil to be measured can withstand, without undergoing substantial oxidation. In the test, the sample of oil is subjected to high temperature and oxygen using a sample of water and a copper catalyst. The pressure in the vessel reduces as oxidation takes place, and the time of oxidation to a given pressure is measured as the oxidation stability time. The technique gives a relative indication of the oxidative stability of an oil, to assist engineers and maintenance personnel in examining the formula of oils, and also to gauge the health of lubricants in turbines, compressors, and additional high-temperature apparatus.
ASTM D2272 Standard Test Method for Oxidation Stability of Steam Turbine Oils by Rotating Pressure Vessel
What is ASTM D2272?
What is the Scope of ASTM D2272?
ASTM D2272 is important to measure the oxidative stability and reliability of turbine oils when subjected to accelerated test conditions. It helps to avert unscheduled downtime, decrease maintenance expenses, and maintain uninterrupted safe operation of turbines by forecasting the lubricant life and performance.
What are the Uses of ASTM D2272 in Industry?
ASTM D2272 is commonly applied in the power generation and petrochemical processing industries, and in the aviation sector, to control lubricant quality, conduct performance checks, and predict future turbine system performance.
Materials Commonly Tested with ASTM D2272
The technique is mostly used on oil of steam turbines, although it also applies to hydraulic fluids and circulating oils, as well as other lubricants that are developed on the basis of oxidation inhibitors.
ASTM D2272 Equipment and Sample Preparation Guide
| Rotating pressure vessel | Manufactured from stainless steel resistant to corrosion at pressures of 700 kPa, the vessel is fitted with a fitting for charging oxygen and for pressure measurement. |
| Copper catalyst coil | Made of 99.9% pure copper wire, cleaned and polished before every test to maintain identical catalytic activity throughout the experiments. |
| Oil sample preparation | The test uses 50 mL of a fully representative turbine oil sample. In addition, it uses 5 mL of distilled water. The sample to be used for the test shall be free from suspended contaminants and moisture. |
Testing Procedures and Requirements for ASTM D2272
| Sample preparation and loading | Put about 50 mL of oil, 5 mL of distilled water, and a polished copper coil catalyst into a stainless-steel bomb. Seal the vessel and charge it with oxygen up to a pressure of about 620 kPa at room temperature. |
| Operating test | The tightly closed bomb is axially rotated at 100 ± 5 rpm in a heated bath at 150 ± 0.1 °C. The rotation causes continuous contact of oil with oxygen to accelerate oxidation. |
| Endpoint determination | The test is terminated when the vessel pressure has decreased by 175 kPa (25 psi) from the maximum pressure. The elapsed time, in minutes, is the oxidation stability or RPVOT value of the oil. |
ASTM D2272 Test Results and Interpretation
Findings are provided in terms of the oxidation stability time in minutes, which is the period during which the pressure drops to 175 kPa. An increase in RPVOT values indicates greater oxidation stability and increased resistance to thermal degradation, but at lower values, it may indicate depleted antioxidants or aging oil that needs replacement.
ASTM D2272 Related Articles
Similar standards are ASTM D943 that determines the stability of oxidizing lubricating oils during testing through the Turbine Oil Stability Test (TOST), ASTM D4310, which is the test of sludge formation in oxidation tests, ASTM D6224, which is the test that guides the monitoring of the condition of the turbine oil, and ASTM D4636, which is the test that addresses performance of inhibited mineral oils.
Safety and Best Practices in ASTM D2272
The operators should be cautious with the oxygen cylinders and high-pressure vessels, and wear appropriate personal protective equipment. The equipment is supposed to be checked on a regular basis to check the existence of leaks and to ensure that the equipment is being maintained in a safe pressure status.
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