This standard specifies the safety technical requirements and inspection methods for leakage of gas supply systems in gas-fired vehicles. This standard applies to all vehicles of M and N categories that use natural gas and liquefied petroleum gas as fuel and have a supply system. GB 19344-2003 Safety Technical Requirements and Inspection Methods for Leakage of Gas Supply Systems in Gas-fired Vehicles GB19344-2003 Standard download decompression password: www.bzxz.net

ICs 43. 080. 01
National Standard of the People's Republic of China
GB 19344----2003
Technical requirement and test method of leaking-safetyof gas supply system on using gas vehicle
Technigue requirement and test method of leaking-safetyof gas supply system on using gas vehicle2003-10-28Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on 2004-06-01
All technical contents of this standard are mandatory. Before the Ministry of Public Security of the People's Republic of China proposed this standard, this standard was under the jurisdiction of the Road Traffic Management Standardization Technical Committee of the Ministry of Public Security. H19344--2003
This standard was drafted by Beijing Public Transportation Research Institute, Shenzhen Special Security Electronics Co., Ltd., Beijing Municipal Administration Committee and Northern Jiaotong University.
The main contributors of this standard are: Wu Tongqi, Pi Jingyi, Su Yihua, Lin Ming, Zhang Xin. 1 Scope
Safety technical requirements and inspection methods for leakage of gas supply system in gas-fired vehicles
This standard specifies the safety technical requirements and inspection methods for leakage of gas supply system in gas-fired vehicles. GB19344—2003
This standard is applicable to all vehicles of M and N categories with fuel supply system using natural gas or petroleum gas as fuel. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. The referenced documents with dates and their subsequent amendments (excluding the contents of the revision) and revisions are not applicable to this standard. However, the parties who have cooperated with the preparation of this standard are encouraged to study whether the latest versions of these documents can be used. For any document without expiration date, the latest version shall be used for this standard: GB/T15089-2001 Classification of motor vehicles and trailers GB/T17895-1999 Vocabulary of natural gas vehicles and liquefied petroleum gas vehicles GA12:1996 Technical requirements and test methods for household combustible gas alarms 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
M and N kind of vehicle G/T15089-2001.
Gas vehicle
G8/T 17895-1999 All items in 2.2. 4 Technical requirements
4.1 There shall be no leakage in the gas supply system.
4.2 When measured by an instrument, the displayed concentration shall not be greater than 25×10\. 5 Inspection method
5.1 Inspection conditionsbZxz.net
5.1.1 During vehicle inspection, the gas pressure in the natural gas storage cylinder shall not be less than 90% of the rated working pressure. 5.1.2 During vehicle inspection, the liquefied petroleum gas capacity in the liquefied petroleum gas cylinder shall not be less than 25% of the rated capacity. 5.1.3 During inspection, the wind speed should be less than 3 n1/s. 5.1.4 During inspection, there should be no oil stains or other dirt on the inspected parts. 5.1.5 During vehicle inspection, the fuel supply valve in the gas system should be in the open state and the generator should be in the off state. 5.2 Test instruments
When inspecting natural gas and liquefied petroleum gas, corresponding instruments should be used. The instruments used should meet the requirements of GA127--1996 and have explosion-proof functions. The instruments should display the results digitally, and their response time should not be greater than 10 s. a) Range: (0~100)×10
GB19344—2003
b) Accuracy: 15%Fs.
5.3 Detection location
Detect the gas supply system connection and related components of the system. 5.4 Concentration detection
When using the instrument for detection, the measuring rod should be connected to the connection point! 1 Move, and the measurement time at each location should not be less than the reverse time requirement. The test results should meet the requirements of 4.2.
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