Rapid testing method for air tightness of gas storage cylinder and pipeline during the inspection of the whole vehicle upon arrival at the port

Salt spray and bumps during the transportation of the entire vehicle by sea can easily cause loosening of the gas storage cylinder welds, loosening of pipeline joints, and aging of sealing rings. Leakage of the gas storage cylinder and gas circuit during port acceptance is a high-frequency hazard. Rapid airtightness testing can prioritize fault screening to avoid frequent repairs by the fleet after delivery. Before acceptance, basic preparations should be made, with triangular wooden wheels, confirmed site ventilation, soap water, timers, and wrenches prepared. The vehicle should be inflated first, and when the air compressor stops inflating and the air pressure stabilizes within the rated range, the engine should be turned off. Static pressure maintenance testing should be carried out, which is the fastest preliminary judgment method. Release the parking brake, keep the brake pedal released, record the initial air pressure, and observe the pressure drop for three minutes. If the pressure drop exceeds the standard, it indicates the existence of leakage. After passing the static test, it can be tested again. Brake pressure holding test, Step on the driving brake and keep it still to continue timing observation. The two tests can quickly distinguish the leakage range of the gas supply circuit and the brake circuit. After the initial screening finds a leakage, priority should be given to using soap water leak detection method to locate the point. Diluted soap water should be evenly sprayed on the weld seam, drain valve, safety valve, various quick plug joints, rubber hose bending position, and pipeline clamps of the air storage cylinder. Slowly observe, and the position where bubbles continue to bubble is the leakage point. Marine vehicles should pay attention to the valve core of the drain valve and the inlet and outlet flanges of the air storage cylinder. These positions are prone to vibration and salt spray erosion. For concealed pipelines, segmented isolation inspection can be used, closing the ball valves between the air storage cylinders, and maintaining pressure separately for each cavity to reduce the leakage range without disassembling extensively. During the acceptance inspection, it is also necessary to check the appearance of the air storage cylinder and inspect whether the cylinder body has any bumps, deformations, or corroded welds, Check if the drain valve switch is smooth, if the safety valve is not stuck or making abnormal noises, if the rubber pipeline is cracked or hard, and if there are many slight leaks that are difficult to detect with the naked eye and sound. Soap water testing has low cost and is suitable for rapid acceptance of vehicles arriving at the port in batches. After the testing is completed, clean the surface of the pipeline to prevent residual liquid from accelerating chassis corrosion. At the same time, keep a good record of the testing, mark the vehicle number, air pressure value, and leakage point location for convenient overseas after-sales processing. It is necessary to pay attention to the pressure drop standard that matches the target market regulations. The limit values may vary slightly in different regions, and do not rely solely on experience to judge. The entire process is simple to operate and does not require professional large-scale equipment. It is suitable for rapid batch verification at the port site. Intercept gas hazards before delivery, reduce cross-border after-sales time and Overseas fleet driving is safe.