GB/T 36883-2018Technical specification of LNG vehicle (English PDF)

4.2 Special equipment for LNG vehicles

Safety protection shall comply with the provisions of GB 7258-2017. Special equipment for LNG vehicles shall comply with the requirements of QC/T 755 and shall also meet the following requirements.

a) The pressure and temperature of the output gas of the special equipment for LNG vehicles shall meet the requirements of the engine

b) In any of the following cases, the special equipment for LNG vehicles shall be able to automatically cut off the LNG output.

1) Ignition switch off;

2) The engine is not running;

3) Gas pipeline breakage, shedding, etc.

c) All electrical components in special equipment for LNG vehicles shall meet the requirements of GB 3836.1.

d) Filling device shall meet the requirements of GB/T 25986.

e) Liquid signal system shall meet the following requirements.

1) The liquid volume display of the LNG vehicle shall be displayed on the instrument. The liquid volume display unit is liter (L) or percentage (scale).

2) LNG vehicles shall be able to give an alarm signal when the volume of the gas cylinder is low. First alarm when the remaining liquid volume does not meet the 100km driving range. Re-alarm when the remaining liquid volume does not meet the 50km driving range.

4.3 Installation of special equipment for LNG vehicles

4.3.1 The installation of special equipment for LNG vehicles shall be carried out in accordance with the provisions of GB/T 20734-2006 and shall also meet the

a) The installation of pipelines shall ensure that the joints of the pipelines are easy to construct, sealed, easy to inspect, and highly reliable.

b) Pipes and components shall avoid high temperature heat sources such as exhaust pipes and superchargers, as well as complete vehicle solenoid valves, mechanical power supply valves, etc.

c) The distance between the pipeline and the joint and the engine exhaust pipe shall be greater than or equal to 100mm. When the distance is between 100mm and 200mm, a reliable and fixed thermal insulation device shall be installed. The distance from the drive shaft shall be greater than or equal to 100mm.

d) For Class M vehicles, piping shall not be installed directly in the cabin. If the gas cylinder is installed at the top of the vehicle, the pipeline can only be installed in the compartment, there shall be no connection joints in the pipeline, and effective isolation and safety protection measures shall be set for the pipeline.

4.3.4 Safety components shall be installed in accordance with the following requirements.

a) The protective installation of special equipment for LNG vehicles shall comply with the provisions of 12.6 and GB/T 20734-2006 in GB 7258-2017. The side guard of the gas cylinder shall comply with the provisions of GB 11567.

b) The alarm device shall be installed in a prominent position in the cab. The detector shall be installed at the top of the closed and semi-enclosed space where there is a large leakage of gas fuel and the risk of accumulation, or where there is a risk of large leakage if it is not closed, such as the cab, passenger compartment, trunk, engine compartment, gas cylinder set box, gas filling panel and pipe joints. The specific installation location can be determined by the vehicle manufacturer itself in accordance with the provisions of this article.

5.1 Type test

LNG vehicles shall be type tested if they meet one of the following conditions.

a) new product or old product produced in transferred plant;

b) production resumed after discontinued production of more than one year;

c) after the formal production, for example, when the structure, material, […]