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With the upgrading of China's vehicle emission standards and the mature application of natural gas technology, LNG vehicles have also received a wide range of market demands. For the on-board gas cylinders, many drivers' friends are not very familiar with it, and more on the basis of fuel tank standards, it would be a mistake.
LNG cylinders for trucks are used as tanks for storing cryogenic liquids. The quality and technical requirements are much higher than that of tanks. Xiao Bian pointed out that the driver's friends are more concerned about LNG cylinder testing and maintenance issues, specifically for everyone to sort out some of the matters needing attention, and we also consulted the technical staff of CIMC St. Dyne, summed up the following seven points.
1. Check for leaks
Before starting the vehicle or after the vehicle's LNG cylinders are filled with liquid for the first time, the driver's friends must use a soap solution to leak all connector joints. If there is a phenomenon of air bubbles emerging, be sure to use professional tools to tighten the leakage joints. At the same time check key parts such as pressure gauges and safety valves to determine their reliability.
2. Check cylinder fasteners
Check that the cylinder and all fittings are firmly fixed to the body and tighten the loose fasteners. Avoid leakage of LNG cylinders. At the same time, keep LNG cylinders clean and clean, and add LNG cylinder guards.
3. Check the circulating water
Every time when the vehicle starts, it is necessary to check whether the circulatory water of the carburetor is unobstructed. Only when the circulating water is unobstructed can the application of liquefied natural gas be realized. If it is not smooth, you need to stop the parking inspection, or consult a professional maintenance personnel.
4. Check the surface of the cylinder
The technical staff of CIMC Santron Company told us that the fastest way to identify the insulation performance of LNG cylinders is to judge whether the surface of the cylinder barrel is dew or frosted. The use temperature of LNG is about -162°C. The ability to handle low temperatures is a good quality cylinder. If there is frosting or frost on the surface of the tank, it is a performance degradation of the insulation, and it is necessary to immediately stop the tank manufacturer for processing.
5. Check the pressure gauge
For vehicle LNG cylinders, only the above inspection is still not enough. The pressure gauge on the cylinder is used as the instrument for measuring gas pressure. The instrument misalignment is likely to occur in the process of use, which will result in pressure charging and actual conditions. The situation is inconsistent, and the occurrence of excessive or too low conditions will affect the vehicle's driving situation and LNG safety. Therefore, the pressure gauge must be checked every year by the local Technical Supervision Bureau.
6. Check safety valve
As a protection valve for LNG cylinders, the safety valve can be opened in time when the pressure of the cylinder increases, and the exhaust gas is stepped down to ensure the safety of the cylinder. If there is a failure, it will lead to long-term leakage of natural gas or excessive pressure on the cylinders, which will cause serious consequences of the cylinder explosion. Therefore, the safety valve is also our annual visit to the local technical supervision bureau for inspection and verification.
7. Check the cylinder
LNG cylinders for trucks are equivalent to tanks for trucks, but they store LNG but require cryogenic high pressure for storage applications. Only regular inspection of the appearance of LNG cylinders, timely detection of problems, every three years to take the initiative to go to the local technical supervision bureau for verification, this is conducive to the timely detection and elimination of hidden dangers, is an important means to ensure the safe operation of LNG trucks.
The popularity of natural gas vehicles makes everyone appreciate the benefits brought by new energy sources. However, they must also pay more attention to the maintenance and inspection of LNG cylinders at the same time they are used, and develop regular observation and maintenance. Only the usual care will be available on the road. More peace of mind.
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