System integration combines equipment, instrumentation, controls, piping, electrical, and structural elements into cohesive, functioning systems that achieve intended performance. Integration challenges increase with system complexity, requiring coordination across disciplines and suppliers.

Integration encompasses physical integration ensuring components fit and connect properly, functional integration so components operate together achieving system performance, control integration coordinating equipment operation through unified control strategies, and data integration sharing information across systems.

For process systems and skid packages, integration involves coordinating equipment specifications for compatible operation, designing piping for proper flow distribution, integrating instruments and controls for monitoring and automation, ensuring utilities meet all component requirements, and verifying integrated performance through factory testing.

Integration challenges include interface management across multiple suppliers, dimensional coordination in tight spaces, control system communication protocols, startup sequencing for safe commissioning, and performance verification proving integrated system meets specifications.

Successful integration requires early planning defining interfaces and responsibilities, specification coordination ensuring compatibility, frequent communication among suppliers and disciplines, systematic testing from component through system level, and commissioning support resolving integration issues.