Pipeline fittings can meet the special requirements of marine environments on offshore equipment, providing high-strength, corrosion-resistant, and reliable sealed pipeline connections, ensuring the safe operation and production efficiency of offshore equipment, and providing a stable and reliable foundation for marine engineering. Marine engineering equipment includes offshore platforms, subsea pipelines, offshore oil extraction facilities, etc. Its special working environment and harsh conditions place extremely high demands on pipeline connections. In the construction of offshore platforms, the platform is subjected to extreme natural environments such as strong winds, waves, seawater erosion, and tidal changes, thus requiring pipeline connections with high strength, corrosion resistance, and reliable sealing. Submarine pipelines are used to transport natural gas, oil, and other liquids or gas products, and their connections must have pressure resistance, corrosion resistance, and reliable sealing characteristics. In offshore oil extraction facilities, such as offshore drilling platforms and FPSOs (Floating Production Storage Units), a large number of pipeline systems are required to transport oil and gas products and treat wastewater.