GB/T 29035-2022 in English
VALIDTest method for flexible graphite ring
- Issued on:2022-12-30
- Implemented on:2023-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$185.00
《GB/T 29035-2022柔性石墨填料环试验方法》由TC350（全国填料与静密封标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
GB/T29035-2022 Standard Overview
The National Standard of the People's Republic of China Test Method for Flexible Graphite Packing Rings (GB/T29035-2022) specifies the instrumentation, sample requirements, test procedures and calculation of test results for the determination of density, friction coefficient, compression rate, rebound rate, thermal weight loss and sulfur content of flexible graphite packing rings. This standard is applicable to the physical, mechanical properties and sulfur content testing of flexible graphite packing rings, replacing the old version of GB/T29035-2012. The main revisions include the addition of a sulfur content determination method and the optimization of thermal weight loss and compression rebound test procedures.
Comparison of standard frameworks
| Old version GB/T29035-2012 | New version GB/T29035-2022 | Main changes |
|---|---|---|
| No sulfur content determination method specified | New sulfur content determination chapter (Chapter 8) | New sulfur content determination method, using oxidation combustion method combined with titration analysis. |
| Limited temperature range for thermal gravimetric test | Extended to 450℃, 600℃ and 670℃ | Optimized thermal gravimetric test conditions, and added high temperature 670℃ test requirements. |
| The schematic diagram of the compression-rebound device is not clear. | Add Figure 4 schematic diagram of the compression-rebound test device. | Improve the standardization requirements for compression-rebound test equipment. |
Core indicator determination method
1. Density determination
The density determination adopts the method of combining vernier caliper and balance, and the formula is as follows:
ρ = (m × 1000) / [(2πD - d²) × h]- m: sample mass (g)
- D: outer diameter (mm)
- d: inner diameter (mm)
- h: height (mm)
2. Friction coefficient determination
Use a friction and wear testing machine (as shown in Figure 1) to calculate the friction coefficient by measuring the friction torque:
μ = M / (r × F)- M: Friction torque (N·m)
- r: Grinding ring radius (m)
- F: Test load (N)
Implementation suggestions
To ensure the accuracy and repeatability of the test results, it is recommended to:
- Strictly calibrate the instruments and equipment in accordance with the standard requirements.
- Perform blank tests and standard sample verification before formal testing.
- Real-time monitoring of key parameters (such as temperature and load).
- Establish a complete test record and report system.
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