D3427-99
Standard Test Method for Air Release Properties of Petroleum Oils

1.1 This test method covers the ability of a petroleum-type steam turbine oil to separate entrained air.

This method measures the ability of an oil to separate entrained gas.  Oils with viscosity at 40°C of less than 9.0 cSt. are tested at 25°C.  Oils with viscosity at 40°C between 9.0 and 90.0 cSt. are tested at 50°C.  Oils with viscosity at 40°C greater than 90.0 cSt. are tested at 75°C.  Subsequent to aeration under test conditions, the time in minutes for entrained gas to reduce to 0.2% by volume is measured and reported.  The method is closely related to DIN 51381 with a slight difference in procedure and reporting format.

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