GB/T 17258-2022 in English
VALIDSteel cylinders for the on-board storage of compressed natural gas as a fuel for automotive vehicles
- Issued on:2022-10-12
- Implemented on:2023-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$534.00
《GB/T 17258-2022汽车用压缩天然气钢瓶》由TC31（全国气瓶标准化技术委员会）归口，TC31SC8（全国气瓶标准化技术委员会车用高压燃料气瓶分会）执行，主管部门为国家标准化管理委员会。
Introduction
Interpretation of core standard updates
Main changes of the 2022 version of the standard compared with the 2011 version:
| Technical Dimensions | 2011 Version Regulations | 2022 Version New Requirements |
|---|---|---|
| Pressure Range | 20MPa Fixed Value | 20/25MPa Dual Parameters |
| Volume Deviation (＞120L) | Not Specified | +≤2.5% |
| Material Phosphorus Content | P≤0.015% | P≤0.012% |
Key Design Specification Points
Formula for calculating cylinder wall thickness:
S=PD/[2(σ)+0.8P]
The design stress coefficient F takes the new adjusted value,and the tensile strength limit is raised to 950MPa
Typical design error case: A manufacturer used unverified Cr-Mo-V steel, which was judged unqualified because the vanadium content of the new material exceeded 0.15%
Innovation of the testing and certification system
- Fire test: Added 590℃ flame protection To meet the requirements, the distance between monitoring points is reduced to 0.75m
- Batch pressure cycle verification is reduced from 100% to random sampling according to production capacity
- Magnetic flux leakage detection transmittance is increased to 99.8%
| Non-destructive testing category | Acceptance standard | Instrument accuracy |
| Ultrasonic testing | ＞2mm defect judgment | ±0.1mm |
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