The monolithic insulating joint is a specialised pressure pipeline element installed at the inlet and outlet of oil and gas pipeline stations. Its core function is to interrupt the longitudinal electrical current path in the pipeline, electrically isolating cathodically protected sections from unprotected sections. This ensures the effective operation of the cathodic protection system and prevents electrochemical corrosion of buried pipelines.Key Features:
Monolithic structure – No removable components; insulating layer and steel body are integrally formed. Service life matches the pipeline design life with no periodic maintenance or replacement required
High electrical insulation – Insulation resistance ≥1 MΩ, meeting cathodic protection engineering requirements
Superior sealing reliability – High-performance sealing materials, verified by FEA under combined hydraulic pressure and bending load conditions, for long-term sealing durability
Wide operating temperature range – Design temperature -46°C to +100°C, suitable for extreme arctic and high-temperature environments
Lightning protection – Removable lightning protection device included, easy to install with high safety
Multi-media compatibility – Clean natural gas, coalbed methane, sour wet gas (H₂S/CO₂-containing), crude oil, and refined petroleum products
Main Technical Parameters:ParameterRangeNominal DiameterDN25 – DN2,000Design Pressure≤ 42 MPaDesign Temperature-46°C to +100°CElectrical Insulation Resistance≥ 1 MΩWorking MediaClean gas, sour wet gas, crude oil, refined products, etc.Typical Applications:
Pipeline station inlets/outlets, oil and gas gathering stations, city gate stations, gas storage surface facilities, and subsea pipeline landfall sections.
