GB/T 34580-2017 in English
VALIDStandard test method for measurement of lubricant generated insoluble colorbodies in in-service turbine oils - Membrane patch colorimetry
- Issued on:2017-09-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 34580-2017运行涡轮机油中不溶有色物质的测定方法 膜片比色法》由TC322（全国电气化学标准化技术委员会）归口，主管部门为中国电力企业联合会。
Introduction
Interpretation of the National Standard of the People's Republic of China GB/T 34580—2017
This standard specifies the determination method of colored insoluble substances in running turbine oil, and is applicable to the detection of related substances in running turbine oil and phosphate ester fire-resistant oil without adding dyes.
Analysis of the background of standard formulation and technological evolution
With the improvement of modern industry's requirements for lubricating oil performance, the monitoring of insoluble colored substances in oil products is particularly important. As an efficient and accurate determination method, the membrane colorimetry has been widely used both internationally and domestically. ASTM D 7843—2012 standard provides an important reference for this national standard.
Instrument and Reagent Specifications
| Project | Technical Requirements | Specifications |
|---|---|---|
| Filter membrane | Nitrocellulose material | Diameter 47mm, pore size 0.45μm |
| Colorimeter | CIELAB colorimetry test | Visible light range 400nm-700nm, resolution 10nm |
| Vacuum pump | Vacuum control | 71kPa±5kPa |
Sample pretreatment and test steps
Sample pretreatment:
- Sampling volume: at least 60mL, preferably using brown containers to prevent ultraviolet interference.
- Heating and aging: heating at 60℃-65℃ for 23h-25h, then placing at 15℃-25℃ to isolate ultraviolet rays for 68h-76h.
Test steps:
- Shake the sample and transfer it to a beaker.
- Add petroleum ether, mix well and filter.
- Wash the filter membrane and air dry to establish a blank background.
- Use a colorimeter to measure the color of the membrane and calculate the CIELAB colorimetric value.
Result calculation and reporting requirements
Calculate L*, a*, b* values according to formulas (1), (2) and (3), and use formula (4) to calculate ΔE color difference. One decimal place should be retained in the report, and the arithmetic mean of the two measurements should be taken as the final result.
Standard framework comparison and implementation suggestions
International comparison:
- Align with ASTM D 7843—2012 standard to ensure data mutual recognition.
- The colorimetric measurement method is consistent, but the equipment accuracy requirement is higher.
Implementation suggestions:
- The laboratory should be equipped with standardized equipment and calibrated regularly.
- Operators need to receive professional training to ensure the accuracy of the experimental process.
- Strengthen the quality control of sample pretreatment to avoid errors.
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