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SH/T 0308-1992 PDF English


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SH/T 0308-1992: PDF in English (SHT 0308-1992)

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. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.