Final answer:
Monthly leakage tests using automatic tank gauges are mandatory for single-walled tanks, typically after each product delivery or when refilled to a specific operational percentage. The exact percentage would be determined by regulations or manufacturers' recommendations, which are crucial for maintaining the necessary gas levels for chemical processes.
Step-by-step explanation:
The question pertains to the utilization of automatic tank gauges for leak detection in single-walled tanks. Such gauges need to perform a test monthly to ensure that there are no leaks. While the question does not provide a specific percentage, generally, the testing is required after product delivery or when the tank is filled within a certain percentage of its highest operating level during the previous month, which is typically a regulatory or manufacturer's requirement.
It's important to know the exact percentage as specified by relevant regulations or operational manuals for specific equipment.
Since the question is related to chemistry but the context is more about industrial processes and equipment, monitoring gas levels accurately ensures that there's enough supply for the reactions and prevents early exhaustion that could disrupt ongoing reactions.