API 5L Insulation Joint, ANSI B31.8, Carbon Steel, 2-48 Inch

Technical Specifications

Product Name: Flanged Insulation Joint with Jumper Cable
Pressure Class: Class 150 - 2500 LB, PN16-PN420
Size Range: DN50-DN1200, 2-48 Inch
Insulation Resistance: ≥10 MΩ (dry condition)
Standards: API 5L, ANSI B31.8
Material: Carbon steel body & flanges

Product Description

The flanged insulation joint is a specialized pipeline fitting designed for cathodic protection systems of buried steel oil and gas pipelines. It provides reliable electrical isolation between pipeline sections, preventing stray current interference and reducing the risk of electrochemical corrosion. The integrated insulating and sealing structure ensures long-term pressure resistance and stable insulation performance under normal operating conditions. Equipped with copper jumper cables and spark gap equalizer protectors, the insulation joint can quickly discharge transient overvoltage caused by lightning strikes or electrical surges, protecting internal insulating components from damage.

Main Construction

1. ANSI standard flanged ends for secure bolted connection with pipeline flanges
2. Integrated pressure-bearing body with built-in insulation and sealing components
3. Connection lugs for installation of jumper cables and surge protection devices
4. Complete accessories including copper jumper cables and spark gap equalizer protectors

Typical Applications

1. Buried natural gas transmission pipelines
2. Crude oil and refined product pipeline systems
3. Compressor stations and valve yards
4. Pipeline sections requiring electrical isolation in cathodic protection systems
5. Separation of catholically protected pipeline segments from non-protected sections