1. The ambient temperature of the modified parts installed in the engine room should be within the range of -40°C to +121°C, and other modified parts should be adapted to the operating temperature range of -40°C to +82.2°C.
2. The structure and quality of compressed natural gas cylinders for natural gas refitted vehicles, the performance of the pressure reducing regulator, the performance of the gas volume display, the performance of the CNG solenoid valve and the gasoline solenoid valve, etc. shall comply with their respective regulations.
3. The manual shut-off valve should comply with relevant regulations. It is advisable to use a manual shut-off valve with an opening and closing range of 0.25 to 1.5 turns, and the directions of "supply (open)" and "interrupt (close)" should be clearly marked.
4. The device used for modification should ensure that when the engine stops running, even if the fuel switch is turned on, it should have a device that can automatically cut off the supply of natural gas.
5. The material of the parts and components of the special device used should be compatible with natural gas, the quality should be in accordance with the requirements of the industry standard, and the specifications should match the installed vehicle type.
6. The material of the natural gas conversion mixer should be compatible with gasoline and natural gas. The type and structure of the mixer should match the pressure reducing regulator. When a diaphragm mixer is used, a tempering and pressure relief device should be installed, and its quality should comply with relevant regulations.
7. When the gas cylinder used is an old gas cylinder that has been removed from another vehicle, it should be inspected in accordance with relevant regulations.
8. The range of the pressure gauge in the gas volume display device should be 1.5 to 2 times the rated working pressure of the natural gas high-pressure system, and its performance should comply with relevant regulations.
9. Natural gas conversion compressed natural gas pipelines should use stainless steel pipes or other high-pressure natural gas pipelines for vehicles, and the burst pressure should not be less than 3.5 times the rated working pressure. Under the condition that the maximum air supply of the engine is met, the diameter of the high-pressure pipeline should be as small as possible, and the high-pressure pipe joints should adopt compression fittings, and their quality should comply with relevant regulations.
10. The installation process layout should be designed reasonably to ensure that the installation and maintenance are convenient; the strength of the vehicle load-bearing parts shall be fully considered, and the weaker installation parts shall be reinforced with strong measures. Installation that reduces the strength and rigidity of the vehicle load-bearing parts is not allowed Method, it is not allowed to use a dedicated device as a carrier.
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