Storage Tank Interstitial Cleaning with Inert Gas

The patent applies the inert atmosphere principle by introducing an inert gas (nitrogen or carbon dioxide) into the interstitial space to displace flammable and toxic materials. This creates a safe environment for cleaning operations by preventing explosive atmospheres and reducing toxic exposure risks. The inert gas is supplied through injection devices positioned in the interstitial space, effectively replacing hazardous gases with non-reactive gas before and during the cleaning process.

The patent uses an intermediary substance (inert gas) to mediate between the hazardous materials in the interstitial space and the cleaning operations. The inert gas acts as a barrier that allows cleaning to proceed safely by preventing direct contact between cleaning personnel/equipment and flammable or toxic materials, while still enabling the cleaning function to be performed.

The patent implements feedback control by using sensors to continuously monitor the concentration of flammable and toxic materials in the interstitial space during cleaning operations. The monitoring system provides real-time information about the cleaning effectiveness and safety conditions, allowing operators to adjust the cleaning process accordingly. When sensor readings indicate that hazardous material concentrations have been reduced to safe levels, the cleaning process can be stopped, optimizing both effectiveness and resource usage.

The patent maintains continuous useful action by performing cleaning operations in multiple cycles with continuous monitoring between cycles. Rather than performing one lengthy cleaning operation, the system conducts repeated shorter cleaning cycles, each followed by monitoring to assess progress. This continuous approach ensures thorough cleaning while allowing for safety assessments throughout the process, managing complexity through structured repetition rather than uncontrolled extended operations.

The patent applies preliminary action by introducing inert gas into the interstitial space before actual cleaning operations begin and during the cleaning process. This pre-establishment of a safe atmosphere prevents explosive conditions from developing during cleaning, eliminating the need for extended ventilation periods. The inert gas is supplied in advance through injection devices, creating a protective environment that allows cleaning to proceed without time-consuming safety delays.

The patent uses pneumatic principles by introducing pressurized inert gas into the interstitial space to displace flammable and toxic materials. The gas is supplied through injection devices that utilize pressure differentials to force the inert gas into the interstitial space and push hazardous materials toward extraction points. This pneumatic approach is more efficient than passive ventilation, rapidly achieving safe atmospheric conditions and reducing overall cleaning time while maintaining high safety standards.