QC/T 755-2020 in English
VALIDTechnical requirements of fuel-gas system for LNG vehicles
- Issued on:2020-12-09
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$262.00
| Standard No: | QC/T 755-2020 |
| Document status: | VALID |
| Title in English: | Technical requirements of fuel-gas system for LNG vehicles |
| Title in Chinese: | 液化天然气汽车燃气系统技术条件 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-12-09 |
| Implemented on: | 2021-04-01 |
| Superseding: |
QC/T 755-2006 Technologe requirements of special equipment for LNG vehicle
|
| Professional Classification: | QC-Automobile |
| Related Keywords: | gas phase gas supply system
exhaust gas safety protection system protection core components gas storage system lng cylinders lng vehicle fuel gas systems technical requirements |
| Related Topics: | Unconventional Gas Technologies
technical gas LNG ignition LNG quality for vehicles Technical conditions for liquefied natural gas vehicles Gas-liquid conditions auto gas technology natural gas liquid pool Liquefied natural gas pressure sealing technology Liquefied natural gas pressure sealing technology qc/t755-2020 |
Introduction
Standard Evolution and Technological Innovation
QC/T 755-2020, as the new standard replacing the 2006 version, has achieved three major technological breakthroughs in the field of LNG vehicle fuel gas systems:
| Dimensions | 2006 Version | 2020 Version | Upgrade Highlights |
|---|---|---|---|
| System Composition | 4 Major Components | 5 Major Modules | Newly Added Gas Recovery Unit and Buffer Tank |
| Safety protection | Basic requirements | Graded protection | Differentiate protection standards for Class N/M vehicles |
| Temperature adaptability | -40~120℃ | -162~120℃ | Extend the low-temperature resistance range of LNG contact parts |
Technical requirements for core components
Gas storage system
LNG cylinders must meet the following requirements:
- Dual safety valve design (main valve 1.2 times the working pressure / auxiliary valve 1.8 times)
- Liquid level display accuracy requirements: Dual alarm for 100km and 50km driving range
- The pressure relief pipe must be directly connected to the gas phase
Gas supply system
Typical case: Carburetor needs to be completed when the engine consumes the maximum fuel:
- LNG is completely gasified
- Gas temperature is raised to the engine intake requirement
- Indirect heating must be used to utilize the waste heat of exhaust gas
Safety protection system
| Protection object | N-type vehicle | M-type vehicle |
|---|---|---|
| Gas cylinder body | Local protection + protective cover | Independent isolation cabin |
| Pressure relief pipe | Lead to a safe location | A waterproof joint is installed at the end |
| Electrical components | Comply with the explosion-proof requirements of GB3836.1 | |
Implementation suggestions
Key points:
- Pipe connections should preferably use double-tube fittings (when pressure > 2MPa)
- Dissimilar metal connections must be treated with anti-corrosion treatment
- All seals must be calibrated regularly (cycle ≤ 12 months)
- The 2006 version of the design documents must be re-registered after the new standard is implemented
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