The document discusses offshore pigging in four phases: commissioning, cleaning and displacement, inline inspection, and isolation. Commissioning relies on batching and specialty dewatering pigs. Cleaning and displacement uses pigs to clean pipelines and displace liquids to maximize throughput. Inline inspection uses ultrasonic and magnetic flux leakage technology on pigs to collect integrity data critical for safely operating offshore lines. Isolation systems allow sections of pipelines to be pressure isolated during maintenance while keeping other sections at operating pressure to minimize downtime.