SH/T 0308-1992 English PDF (SHT0308-1992)

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SH/T 0308-1992: Determination Method for Air Release Value of Lubricating oils
SH/T 0308-1992
SH
Petrochemical Industry Standard
of the People’s Republic of China
Replacing SY 2693-85
Determination Method for Air Release Value of Lubricating
Oils
APPROVED ON: MAY 20, 1992
IMPLEMENTED ON: MAY 20, 1992
Approved by: China Petrochemical Corporation (Sinopec Group)
Table of Contents
1 Subject Content and Application Scope ... 3
2 Definitions ... 3
3 Overview of Method ... 3
4 Instruments and Materials ... 3
5 Test Procedures ... 5
6 Report ... 7
7 Precision ... 7
Additional information: ... 8
Determination Method for Air Release Value of Lubricating
Oils
1 Subject Content and Application Scope
This Standard specifies the method for determining the ability of lubricating oil to separate mist
from air.
This Standard is applicable to petroleum products such as turbine oil and hydraulic oil.
2 Definitions
Air release value: Under the conditions specified in this Standard, the time required for the
volume of mist air in the specimen to be reduced to 0.2%. This time is the bubble separation
time and is expressed in min.
3 Overview of Method
Heat the sample to 25°C, 50°C or 75°C, blow excessive compressed air into the specimen, and
stir the specimen violently. The air forms small bubbles in the specimen, i.e., mist air. After
stopping the air flow, record the time when the volume of the mist air in the specimen is reduced
to 0.2%.
4 Instruments and Materials
4.1 Instruments
The instrument consists of the following parts, as shown in Figure 1.
5 Test Procedures
5.1 Wash and dry the heat-resistant jacketed glass test tube with chromic acid solution; and
install it according to Figure 1.
5.2 Pour 180mL of the specimen into the heat-resistant jacketed glass test tube and put it in a
small density meter.
5.3 Connect the circulating water bath to allow the specimen to reach the test temperature; and
generally, circulate for 30 min.
5.4 Read the value from the small density meter until it reaches 0.001g/cm3; move the small
density meter up and down with tweezers; and read it again after it stops. The two readings
shall be consistent. If the two readings do not repeat, read it again after 5 min until it repeats.
Record this density value, which is the initial density d0.
NOTE: It can also use a density balance with the same accuracy or more precision (division of
0.0001g/cm3). When using a density balance, the sinker shall be placed in a glass cylinder with a cover
and placed in a circulating bath so that the sinker can reach the test temperature. When the sinker reaches
the test temperature, carefully immerse it in the specimen without air bubbles sticking to it. Use platinum
wire to add the sinker to the beam of the density balance so that the bottom of the sinker is 10 ± 2 mm
away from the bottom of the jacketed test tube.
5.5 Take out the small density meter from the test tube; put it in the oven; and keep it at the test
temperature. Put a vent pipe (as shown in Figure 2) in the test tube; connect the air source; and
introduce compressed air after 5 min to make the pressure reach a gauge pressure of 19.6 kPa
(0.2 kgf/cm2) at the test temperature. Maintain the pressure and temperature and adjust them if
necessary. Turn on the air heater at the same time during ventilation to control the air
temperature within ± 5°C of the test temperature.