Double-Containment Injection Lance for Chemical Leak Control

The patent implements a double containment system where an inner conduit carrying chemical flow is nested within an outer conduit. This nested structure provides redundant containment - if the inner conduit leaks, the outer conduit prevents environmental release. The inner conduit has outlets facing the outer conduit wall, allowing chemical injection into the process stream while maintaining dual-layer protection throughout the injection system.

The containment system is segmented into distinct functional layers: the inner conduit for primary chemical transport and injection, the outer conduit for secondary containment and leak detection, and separate seal assemblies at connection points. This segmentation allows each layer to perform its specific containment function independently, improving overall reliability without requiring a monolithic complex structure.

The double containment system is divided into modular sections with discrete connection points using flange and seal assemblies. The inner and outer conduits are separated at injection points and connection locations, allowing individual components to be accessed, inspected, and replaced independently. This modular segmentation enables maintenance personnel to repair or replace only the defective conduit section rather than the entire double containment system.

Flange and seal assemblies serve as intermediary components between conduit sections and at connection points to the chemical tank and process line. These standardized intermediary elements facilitate easy disconnection and reconnection of conduit sections during maintenance, simplifying repair operations while maintaining the integrity of the double containment structure during normal operation.

Seal assemblies are strategically positioned at specific high-risk locations where leaks are most likely to occur: at the connection between the inner conduit and chemical tank, at the injection lance connection points, and where the outer conduit connects to the process line. Each seal assembly is a localized solution targeting critical leakage paths, providing enhanced sealing reliability without requiring seals throughout the entire conduit length.

The seal assemblies are nested within the flange connections, with seals positioned between mating flange surfaces. This nested arrangement integrates the sealing function directly into the connection structure, providing reliable sealing at critical joints without adding separate external sealing components that would increase overall device complexity.