Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 7596-2008 In-service quality criteria of turbine oils used in power plants, and the following main technical changes have been made with respect to GB/T 7596-2008:
——the name is revised;
——the scope is revised;
——the versions of normative references are updated and revised;
——the quality indexes of in-service turbine oils and those of in-service gas turbine oils are combined;
——the indexes including “flash point”, “foaminess” and “air release value” are added to the quality criteria of in-service gas turbine oils used in power plants;
——the index “mechanical impurities” is deleted from the quality indexes of in-service turbine oils used in power plants;
——for in-service turbine oils, the index “chromaticity” is added;
——the indexes including solid particle contamination level, foaminess, RBOT value and antioxidant content are revised;
——Annex A is revised to "SAE AS4059F particulate contamination classification standard".
This standard was proposed by the China Electricity Council (CEC).
This standard is under the jurisdiction of the National Technical Committee on Electrochemistry of Standardization Administration of China (SAC/TC 322).
The previous editions of the standard replaced by this standard are as follow:
——GB/T 7596-1987, GB/T 7596-2000 and GB/T 7596-2008.
In-service quality criteria of mineral turbine oils used in power plants
1 Scope
This standard specifies the quality criteria of mineral turbine oils used for lubrication and speed regulation of turbine, water turbine and gas turbine systems in power plants.
This standard is applicable to the quality supervision of mineral turbine oils used for lubrication and speed regulation of turbine, water turbine and gas turbine systems in power plants. It may also be referred to for the quality criteria of mineral turbine oils used for phase modifiers, water pumps and other power plant equipment.
This standard is not applicable to all kinds of synthetic liquid used for lubrication and speed regulation of turbine.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 264 Petroleum products—Determination of acid number
GB/T 265 Petroleum products—Determination of kinematic viscosity and calculation of dynamic viscosity
GB/T 3141 Industrial liquid lubricants—ISO viscosity classification
GB/T 3536 Petroleum products—Determination of flash and fire points—Cleveland open cup method
GB/T 6540 Petroleum products—Determination of colour
GB/T 7600 Determination of water content in transformer oils in service by coulometric method
GB/T 7602 Determination of T501 oxidation inhibitor content in transformer and turbine oils in service by spectrophotometric method
GB/T 7605 Determination of clemulsibility characteristics of turbine oils in service
GB 11120 Lubricating oils for turbines
GB/T 11143 Standard test method for rust-preventing characteristics of inhibited mineral oil in the presence of water
GB/T 12579 Determination of foaming characteristics of lubricating oils
GB/T 14541 Guide for maintenance and supervision of in-service mineral turbine oil used for power plants
DL/T 429.1 Determination of transparency of electric power oils
DL/T 432 Determination of particulate contamination in oil
SH/T 0308 Determination method for air release value of lubricating oil
SH/T 0193 Lubricating oils—Determination of oxidation stability—Rotating pressure vessel method
SAE AS4059F Aerospace fluid power—Contamination classification for hydraulic fluid
ASTM D6971 Standard test method for measurement of hindered phenolic and aromatic amine antioxidant content in non-zinc turbine oils by linear sweep voltammetry
3 Technical requirements
3.1 The acceptance of new turbine oils shall be carried out in accordance with GB 11120.
3.2 The quality of in-service turbine oils shall meet those specified in Table 1.
3.3 The routine test cycle and test items of in-service turbine oils shall be in accordance with the requirements of GB/T 14541.
Table 1 In-service mineral turbine oil quality
No. Item Quality index Test method
1 Appearance Transparent, without impurities or suspended substances DL/T 429.1
2 Chromaticity ≤5.5 GB/T 6540
3 Kinematic viscosity a (40℃)/(mm2/s) 32 Not exceeding ±5% of the new oil measurement value GB/T 265
46
68
4 Flash point (open cup)/℃ ≥180℃, and not lower than the previous measured value by 10℃ GB/T 3536
5 Particulate contamination level b
SAE AS4059F, level ≤8 DL/T 432
6 Acid number (in KOH)/(mg/g) ≤0.3 GB/T 264
7 Liquid phase corrosion c No rust GB/T 11143 (Method A)
8 Demulsibility c (54℃)/min ≤30 GB/T 7605
9 Moisture c/(mg/L) ≤100 GB/T 7600
10 Foaminess (foaming tendency/foaming stability)/(mL/mL)
not greater than 24℃ 500/10 GB/T 12579
93.5℃ 100/10
24℃ again 500/10
11 Air release value (50℃)/min ≤10 SH/T 0308
12 RBOT value (150℃) / min Not less than 25% of the original measured value of the new oil, and the oil for turbine and water turbine ≥100
Oil for gas turbine ≥200 SH/T 0193
13 Antioxidant content/% T501 antioxidant Not less than 25% of the original measured value of the new oil GB/T 7602
Hindered phenolic and aromatic amine antioxidant ASTM D6971
a 32, 46, and 68 are the ISO viscosity grades specified in GB/T 3141.
b Particle size shall be tested for units of 100 MW and above, and mechanical impurities shall be visually inspected for units below 100 MW.
For an equipment with the oil tank filled with mineral turbine oil of the speed regulating system or that shared by the lubrication system and the speed regulating system, the particulate contamination level in oil shall be in accordance with the indexes proposed by the equipment manufacturer, and the SAE AS4059F particulate contamination classification standards are given in Annex A.
c For mineral turbine oils used for a single gas turbine, this index is not required to be tested.
Foreword i
1 Scope
2 Normative references
3 Technical requirements
Annex A (Informative) SAE AS4059F particulate contamination classification standard
