During the use of a Compressed Natural Gas Hose, regular visual inspections, routine checks, and monitoring of operating conditions are essential for identifying potential problems promptly. Compressed natural gas is highly flammable and is stored and transported under high pressure. If the hose or its connections develop a fault, the resulting safety risks can be significant. Therefore, users should establish consistent inspection practices rather than waiting until an obvious malfunction occurs before investigating.
First, inspect the overall external condition of the hose. Under normal circumstances, the hose surface should not show obvious cracks, bulges, abnormal swelling, localized depressions, severe abrasion, or other visible damage. If the surface material develops cracks, peeling, discoloration, or localized deformation, the hose should be evaluated to determine whether it remains safe to use. Particular attention should be paid to areas that bend frequently, come into contact with equipment, or are exposed to friction, as these locations may be more susceptible to damage. However, an intact outer surface does not guarantee that the hose is free from internal defects. Therefore, visual inspection alone is not sufficient to determine whether the hose can continue operating safely.
Second, pay close attention to the condition of the connections. The points where the hose connects to equipment, valves, or other components are important areas to inspect. Check for abnormal movement, damaged fittings, signs of loosening, and other irregularities. If a connection appears abnormal, do not attempt to disassemble or tighten it while the system is pressurized. Instead, follow the equipment's operating procedures, implement the necessary safety measures, and arrange for qualified personnel to inspect and address the problem.
Third, remain alert to possible signs of natural gas leakage. Natural gas is generally odorless in its natural state, although odorants may be added to the gas supply to help people detect leaks. However, odor alone is not a reliable detection method. If a suspected gas odor, unusual hissing sound, gas detector alarm, or other indication of leakage occurs, treat the situation as a potential hazard. Never use an open flame, lighter, or other ignition source to check for leaks. Do not approach the suspected leak to investigate it at close range. Follow the site's emergency procedures, stop the relevant operations when it is safe to do so, move away from the hazardous area, and contact qualified personnel for assistance.
In addition, monitor the hose's operating condition. If the equipment experiences unexplained pressure fluctuations, irregular gas supply, unusual vibration around the connections, or noticeable hose movement, twisting, or persistent friction during operation, investigate the cause promptly. These conditions do not necessarily mean that the hose itself is damaged, but they may indicate problems with the connections, equipment operation, or hose routing. Such warning signs should never be ignored.
Finally, establish a routine inspection and recordkeeping system. Maintain records of the hose's service history, inspection results, identified problems, and corrective actions. These records can help identify recurring damage and determine when professional inspection is necessary. If the hose develops cracks, bulges, significant abrasion, suspected leakage, or other safety-related abnormalities, discontinue its use and take appropriate isolation measures. Do not continue transporting compressed natural gas after applying temporary fixes such as wrapping, taping, or patching. Consistent inspections, proper operating practices, and timely corrective action can reduce the risk of abnormal conditions developing into serious safety incidents.