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GB/T 12581-2006 PDF in English

GB/T 12581-2006 (GB/T12581-2006, GBT 12581-2006, GBT12581-2006)
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GB/T 12581-2006: PDF in English (GBT 12581-2006)

GB/T 12581-2006
ICS 75.100
E 30
Replacing GB/T 12581-1990
Standard Test Method for Oxidation
Characteristics of Inhibited Mineral Oils
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Summary of Test Method ... 6 
4 Significance and Use ... 6 
5 Apparatus ... 6 
6 Reagents and Materials ... 12 
7 Sampling ... 13 
8 Preparation of Apparatus ... 13 
9 Procedure ... 15 
10 Calculation ... 20 
11 Report ... 21 
12 Precision ... 21 
Appendix A (Normative) Semiquantitative Microdetermination of Acid
Number of Lubricating Oils during Oxidation Testing ... 23 
Appendix B (Informative) Procedure for Packaging Catalyst Coils ... 28 
This Standard modifies and adopts ASTM D943-04a "Standard Test Method for
Oxidation Characteristics of Inhibited Mineral Oils".
This Standard is redrafted in accordance with ASTM D943-04a. In order to suit the
China's national conditions, this Standard is revised when adopting ASTM D943-04a.
The main differences between this Standard and ASTM D943-04a are as follows.
— Because there is no supply of Nochromix or Micro in China, the cleaning agent
is replaced with chromic acid cleaning solution.
— The normative reference ASTM D5770 in the original standard has no
corresponding China standard, and this Standard only applies to the
determination for acid number of lubricating oil during oxidation test, thus it is
taken as Appendix A in standard revision.
— Partial normative references of this Standard adopt the national current effective
standards corresponding to the standards referenced in ASTM D943-04a.
— Expression of repeatability and reproducibility is modified to traditional
expression type of China.
— There is no keyword content in the national standard, therefore the chapter of
keywords in ASTM D943-04a is deleted.
This Standard replaces GB/T 12581-1990 "Standard Test Method for Oxidation
Characteristics of Inhibited Mineral Oils".
The main revision content of this Standard over GB/T 12581-1990 is as follows.
— As the oxidation lifetime of newly developed oils is extended largely, in order to
reduce the sample consumption due to sampling or as it is difficult to determine
the titration end point with indicator due to sample darkening, two methods such
as Appendix A and GB/T 7304 are added for the determination method of acid
number of this Standard based on the reservation of SH/T 0163, for the
selection of acid number determination.
— Partial normative references adopt the corresponding national standards and
professional standards.
— Add the requirements for protecting sample against illumination.
— Refine the requirements for sampling time interval and specify the treatment
method when the oxidation lifetime exceeds 10000h.
— Add the selective method using oil level indicator strip to indicate the oil level.
— Delete "oxidation stability test device diagram" and add "oil level indicator strip"
— Add the content of precision requirements for two sets of repeated test results in
two laboratories.
— Propose another selection for metal bath as a liquid heating bath, and allow
electronic temperature measuring equipment to replace thermometer.
— Illustrate the procedure to set and measure bath temperature in more detail.
— Add Appendix A "Semiquantitative Microdetermination of Acid Number of
Lubricating Oils during Oxidation Testing" and Appendix B "Procedure for
Packaging Catalyst Coils".
Appendix A in this Standard is normative and Appendix B is informative.
This Standard was proposed by China Petrochemical Corporation.
This Standard shall be under the jurisdiction of Sinopec Research Institute of
Petroleum Processing.
Drafting organization of this Standard. PetroChina Company Limited Lubricating Oil
Research and Development Center.
Chief drafting staffs of this Standard. Yu Bing, Su Jiang and Li Jianxin.
The previous edition replaced by this Standard is as follows.
— GB/T 12581-1990.
Standard Test Method for Oxidation
Characteristics of Inhibited Mineral Oils
1 Scope
1.1 This Standard specifies the evaluation of the oxidation stability of inhibited steam
turbine oils in the presence of oxygen, water, and copper and iron metals at an
elevated temperature. This test method is limited to a maximum testing time of
10000h. This test method is also used for testing other oils, such as hydraulic oils and
circulating oils having a specific gravity less than that of water and containing rust and
oxidation inhibitors.
1.2 This Standard adopts SI units.
1.3 This Standard is involved in some materials, operations and equipment with
hazard, but does not purport to address all of the safety concerns. Therefore, it is the
responsibility of the user of this Standard to establish appropriate safety and
protective measures and determine the applicability of management system prior to
2 Normative References
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. For dated reference, subsequent amendments
(excluding corrigendum) or revisions of these publications do not apply. However, all
parties who enter into an agreement according to this Standard are encouraged to
study whether the latest edition of these documents is applicable. For undated
references, the latest edition of the normative document is applicable to this Standard.
GB/T 514 "Liquid in Glass Thermometers for Petroleum Products-Specification"
GB/T 699 "Quality Carbon Structural Steels"
GB/T 4756 "Petroleum Liquids-Manual Sampling" (GB/T 4756-1998, eqv
GB/T 4945-2002 "Standard Test Method for Acid and Base Number of Petroleum
Products and Lubricants by-Colour-indicator Titration"
GB/T 5231 "Wrought Copper and Copper Alloys Chemical Composition Limits and
Forms of Wrought Products"
GB/T 6682 "Water for Analytical Laboratory Use-Specification and Test Methods"
(GB/T 6682-1992, neq ISO 3696.1987)
GB/T 7304 "Petroleum Products and Lubricants-Determination of Neutralization
Number-Potentiometric Titration Method"
GB/T 17039 "Standard Practice for Utilization of Test Data to Determine
Conformance with Specifications"
SH/T 0163 "Standard Test Method for Acid Number of Petroleum Products by
Semi-micro Color Indicator Titration"
SH/T 0565 "Standard Test Method for Determination of the Sludging Tendencies of
Inhibited Mineral Oils"
3 Summary of Test Method
The sample is contacted with oxygen in the presence of water and an iron-copper
catalyst at 95°C. The test continues until the measured acid number of the sample is
2.0mgKOH/g or above. The number of test hours required for the sample to reach
2.0mgKOH/g is the "oxidation lifetime".
4 Significance and Use
This test method is widely used for specification purposes and is considered of value
in estimating the oxidation stability of lubricants, especially those that are prone to
water contamination. It should be recognized, however, that correlation between
results of this method and the oxidation stability of a lubricant in field service may vary
markedly with field service conditions and with various lubricants. The precision
statement for this method was determined on steam turbine oils.
Note. In the course of testing a lubricant by this method, other signs of deterioration, such as
sludge formation or catalyst coil corrosion, may appear that are not reflected in the calculated
oxidation lifetime. The application of alternative criteria for evaluation of lubricants using this
test apparatus is under study. Test Method SH/T 0565 is now available for sludge tendency
5 Apparatus
5.1 Oxidation Cell, of borosilicate glass, as shown in Figure 1, consisting of a test
tube, condenser, and oxygen delivery tube. The test tube has a calibration line at
300mL (maximum error 1mL) at 20°C.
heating liquid itself to a depth of 355±10mm.
Note. Metal heating baths meeting the test method requirements may also be used. It is not
known what types of heating baths were used in developing the precision statement.
5.2.1 Studies have suggested that direct sunlight or artificial light may adversely
influence the results of this test. To minimize effects of light exposure on the sample,
light shall be excluded from the sample by one or more of the following ways. Use of heating baths that are constructed of metal, or combinations of
metals and other opaque...
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.