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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 3 of GB/T 33540.
This part 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 3: Gear 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 gear oils for wind turbine, which adopts synthetic oils as the base by mixing with various types of function additives.
This part is applicable to gear oils for gear transmission system of wind turbine. The gear transmission system includes the main gearbox, yaw reduction gearbox and variable pitch reduction gearbox.
Products described in this part are particularly applicable to wind turbine gearbox of low temperature type.
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 1690 Rubber, Vulcanized or Thermoplastic - Determination of the Effect of Liquids
GB/T 1995 Petroleum Products - Calculation of Viscosity Index
GB/T 2541 Petroleum Products; Computation Table for Viscosity Indices
GB/T 3141 Industrial Liquid Lubricants - ISO Viscosity Classification
DIN 51819-3 Testing of Lubricants - Mechanical-dynamic Testing in the Roller Bearing Test Apparatus FE8 - Part 3: Test Method for Lubricating Oils, Oblique Axial Ball Bearing
FVA 54/I-IV Procedure for the Investigation of the Micro-pitting Capacity of Gear Lubricants
3 Product Variety and Designation
3.1 Product Variety
This part includes a product variety of gear oils for wind turbines, and its products are classified into three viscosity grades, i.e., 150, 220 and 320, according to GB/T 3141.
3.2 Product designation
The designations of the products in this part are: product name (category) viscosity grade standard No.
Example: gear oils for wind turbine (synthetic) 320 GB/T 33540.3.
4 Requirements and Test Methods
Technical requirements and test methods for gear oils for wind turbine (synthetic) are listed in Table 1.
Table 1 Technical Requirements and Test Methods for Gear Oils for Wind Turbine (Synthetic)
kinematic viscosity after shearing at 40℃, /(mm2/s) Within the viscosity grade NB/SH/T 0845
Cleanlinessc /Grade ≤ 8 DL/T 432
Rubber compatibilityd Report GB/T 1690
a If there is a dispute on the result, it shall be subject to the arbitration according to GB/T 265.
b If there is a dispute on the result, it shall be subject to the arbitration according to GB/T 1995.
c Cleanliness shall be judged according to the measurement method of DL/T 432, and the grading result according to GB/T 14039 may be provided at the time as required by the customer.
d According to the rubber test pieces provided by the customer, both parties negotiate to determine the test conditions and indexes.
5 Inspection Rules
5.1 Inspection classification and items
5.1.1 End-of-manufacturing inspection
End-of-manufacturing batch inspection items include: kinematic viscosity, viscosity index, apparent viscosity (-30℃), pour point, foaming characteristics, water, copper corrosion and cleanliness.
Where raw materials and technological conditions would not present changes which may affect the product quality, the periodic end-of-manufacturing inspection shall meet the following requirements: flash point (opening) shall be determined for every ten lots (those insufficient to ten lots shall be determined annually), and demulsibility shall be determined for every five lots (those insufficient to five lots shall be determined annually); liquid phase corrosion (Method B) shall be determined for every ten lots (those insufficient to ten lots shall be determined annually); oxidation stability, scuffing load capacity (four-ball method), wear resistance (four-ball machine method), scuffing load capacity (FZG visual observation), and shear stability shall be inspected at least once every 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.
Foreword II 1 Scope 2 Normative References 3 Product Variety and Designation 4 Requirements and Test Methods 5 Inspection Rules 6 Marking, Packaging, Transportation and Storage
