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GB/T 33540 Lubricants for Wind Turbine is divided into 4 parts:
——Part 1: Bearing Greases;
——Part 2: Open Gear Greases;
——Part 3: Gear Oils;
——Part 4: Hydraulic Oils.
This part is Part 4 of GB/T 33540.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the National Technical Committee on Petroleum Products and Lubricants of Standardization Administration of China (SAC/TC 280).
This part is under the jurisdiction of the Subcommittee on Synthetic Grease of National Technical Committee on Petroleum Products and Lubricants of Standardization Administration of China (SAC/TC 280/SC 5).
Lubricants for Wind Turbine - Part 4: Hydraulic Oils
1 Scope
This part of GB/T 33540 specifies the product variety and designation, requirements and test methods, inspection rules and marking, packaging, transportation and storage of hydraulic oils for wind turbine.
This standard is applicable to the hydraulic oils for hydraulic system of wind turbine such as brake system, transmission system and variable pitch system.
2 Normative References
The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 260 Determination of Water Content in Petroleum Products
GB/T 265 Petroleum Products - Determination of Kinematic Viscosity and Calculation of Dynamic Viscosity
GB/T 1884 Crude Petroleum and Liquid Petroleum Products - Laboratory Determination of Density - Hydrometer Method
GB/T 1885 Petroleum Measurement Tables
GB/T 1995 Petroleum Products - Calculation of Viscosity Index
GB/T 2433 Petroleum Products - Lubricating Oils and Additives - Determination of Sulphated Ash
GB/T 2541 Petroleum Products; Computation Table for Viscosity Indices
GB/T 3141 Industrial Liquid Lubricants - ISO Viscosity Classification
GB/T 3535 Petroleum Products - Determination of Pour Point
GB/T 3536 Petroleum Products - Determination of Flash and Fire points - Cleveland Open Cup Method
GB/T 4756 Petroleum Liquids - Manual Sampling
GB/T 4945 Standard Test Method for Acid and Base Number of Petroleum Products and Lubricants by Colour-Indicator Titration
GB/T 5096 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test
GB/T 6540 Petroleum Products; Determination of Colour
GB/T 7304 Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration
GB/T 7305 Standard Test Method for Water Separability of Petroleum Oils and Synthetic Fluids
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 12581 Standard Test Method for Oxidation Characteristics of Inhibited Mineral Oils
GB/T 14039 Hydraulic Fluid Power - Fluids - Method for Coding the Level of Contamination by Solid Particles
GB/T 14832 Test Methods for Compatibility between Hydraulic Fluids and Standard Elastomeric Materials
DL/T 432 Determination of Particulate Contamination in Oil
NB/SH/T 0306 Standard Test Method for Evaluating the Scuffing Load Capacity of Oils (FZG Visual Observation)
NB/SH/T 0870 Standard Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)
SH/T 0103 Standard Test Method for Shear Stability of Polymer Containing Fluids Using an European Diesel Injector Apparatus
SH 0164 Petroleum Products - Rules in Packaging, Storage, Transportation and Acceptance of Delivery
SH/T 0209 Determination for Heat Stability of Hydraulic Oil
SH/T 0210 Test Methods for Filterability of Hydraulic Oil
SH/T 0301 Determination Method of Hydrolytic Stability of Hydraulic Liquid (Glass Bottle Method)
SH/T 0308 Determination Method for Air Release Value of Lubricating Oil
SH/T 0565 Standard Test Method for Determination of the Sludging and Corrosion Tendencies of Inhibited Mineral Oils
SH/T 0604 Crude Petroleum and Petroleum Products - Determination of Density - Oscillating U-tube Method
SH/T 0787 Standard Test Method for Indicating Wear Characteristics of Petroleum Hydraulic Fluids in a High Pressure Constant Volume Vane Pump
3 Product Variety and Designation
3.1 Product variety
This part includes a product variety of hydraulic oils for wind turbines, and its products are classified into one viscosity grade 32 according to GB/T 3141.
3.2 Product Designation
The designations of hydraulic oils for wind turbines are: product name viscosity grade standard No.
Example: hydraulic oils for wind turbine 32 GB/T 33540.4
4 Requirements and Test Methods
Technical requirements and test methods for hydraulic oils for wind turbine are listed in Table 1.
Table 1 Technical Requirements and Test Methods for Hydraulic Oils for Wind Turbine
Item Quality index
Viscosity grade (GB/T 3141)
32 Test method
Density (20℃) (kg/m3) Report GB/T 1884 and GB/T 1885
or SH/T 0604a
Chromaticity/No. Report GB/T 6540
Appearance Clear Visual observation
Flash point (opening)/℃ ≥ 200 GB/T 3536
Kinematic viscosity (40℃)/(mm2/s) 28.8 ~ 35.2 GB/T 265 or NB/SH/T 0870b
The temperature at kinematic viscosity of 1,500 mm2/s, /℃ ≤ -18 GB/T 265 or NB/SH/T 0870b
Viscosity index ≥ 140 GB/T 1995 or GB/T 2541c
Pour point/℃ ≤ -42 GB/T 3535
Acid number (in KOH), /(mg/g) Report GB/T 4945 or GB/T 7304d
Water (mass fraction) /% ≤ Trace GB/T 260
Cleanliness e/grade ≤ 8 DL/T 432
Copper corrosion (100℃, 3 h), /grade ≤ 1 GB/T 5096
Sulphated ash /% Report GB/T 2433
Liquid phase corrosion (24 h) No rust GB/T 11143 (Method B)
Foaming characteristics (foam tendency/foam stability) /(mL/mL) GB/T 12579
Procedure I (24℃)
Procedure II (93.5℃)
Procedure III (after 24℃) ≤
≤
≤ 150/0
75/0
150/0
Air release value (50℃), /min ≤ 5 SH/T 0308
Water separability (time for emulsion to 3 mL)/min
54℃ ≤ 30 GB/T 7305
Shear stability (decrease scale of kinematic viscosity at 40℃ after 250 cycles)/% ≤ 6 SH/T 0103
Rubber compatibility f
NBR1 (100℃, 168 h) GB/T 14832
Volume change /% 0~12
Hardness change 0~-7
Oxidation stability
Total acid number (in KOH) after 1,500 h, /(mg/g) ≤ 1.5 GB/T 12581
Sludge after 1,000 h, /mg Report SH/T 0565
Scuffing load capacity NB/SH/T 0306
FZG gear machine test/failure grade ≥ 10
Wear characteristics of vane pump (35VQ25) SH/T 0787
Total weight loss, /mg ≤ 90
Hydrolytic stability SH/T 0301
Copper weight loss, /(mg/cm2) ≤ 0.2
Total acidity at water layer/(in KOH), /mg ≤ 4.0
Copper appearance Without grey or black color
Heat stability (135℃, 168 h) SH/T 0209
Weight loss of copper rod/(mg/200 mL) ≤ 10
Weight loss of copper rod/(mg/200 mL) Report
Total sediment weight/(mg/100 mL) ≤ 100
Kinematic viscosity change at 40℃, /% Report
Change rate of acid number /% Report
Copper appearance Report
Steel rod appearance Discoloration
Filterability/s SH/T 0210
No water ≤ 300
2% water g ≤ 300
a If there is a dispute on the result, it shall be subject to the arbitration according to GB/T 1884 and GB/T1885.
b If there is a dispute on the result, it shall be subject to the arbitration according to GB/T GB/T 265.
c If there is a dispute on the result, it shall be subject to the arbitration according to GB/T 1995.
d If there is a dispute on the result, it shall be subject to the arbitration according to GB/T 4945.
e It shall be judged according to the determination method specified in DL/T 432; the grading result according to GB/T 14039 may be provided at the same time as required by the customer.
f The type, test conditions and indexes of the rubber test piece may be determined through negotiation with the user.
g The filtration time under water presenting condition does not exceed two times that under no water condition.
5 Inspection Rules
5.1 Inspection classification and items
5.1.1 End-of-manufacturing inspection
End-of-manufacturing batch inspection items include: density, chromaticity, appearance, flash point (opening), kinematic viscosity, the temperature at kinematic viscosity of 1,500mm2/s, viscosity index, pour point, acid number, water, cleanliness, copper corrosion, foaming characteristics, air release value and water separability.
Where raw materials and technological conditions would not present changes which may affect the product quality, the items of periodic end-of-manufacturing inspection include: sulphated ash, liquid phase corrosion, shear stability, hydrolytic stability, heat stability and filterability, all of which shall be inspected at least once per year.
5.1.2 Type inspection
Type inspection items include all the items specified in the technical requirements of Chapter 4.
Type inspection is carried out under the following conditions:
a) Beginning of production or type approval inspection of new products;
b) Significant changes of raw materials and manufacturing techniques which may affect the product quality;
c) The result of end-of-manufacturing inspection is greatly different to the previous type inspection result.
5.2 Batching
Under the condition that raw material and technology are not changed, the products of a tank or a kettle form a group (batch).
5.3 Sampling
The sampling is carried out according to GB/T 4756, and the sample volume shall be in accordance with the required volume of the end-of-manufacturing inspection/type inspection and sample reservation.
5.4 Judgment rules
The product is regarded as qualified where the results of end-of-manufacturing inspection and type inspection meet the technical requirements specified in Chapter 4.
Foreword I
1 Scope
2 Normative References
3 Product Variety and Designation
4 Requirements and Test Methods
5 Inspection Rules
6 Marking, Packaging, Transportation and Storage
