Carbon Steel Flanged Insulation Joint, API 5L, ANSI B31.8

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

Main Construction

1. Flanged ends: ANSI standard flanges for bolted connection with pipeline flanges
2. Integral pressure-bearing body with built-in insulating and sealing assembly
3. Lugs for connecting jumper cables and surge protection devices
4. Accessories: copper jumper cables, spark gap equalizer protectors

Product Description

The flanged insulation joint is a special fitting for cathodic protection systems of buried steel oil & gas pipelines. It electrically isolates pipeline sections to cut off stray currents and mitigate electrochemical corrosion.

Supplied complete with a copper jumper cable and spark gap equalizer protectors. It maintains high electrical insulation under normal operating conditions. In case of a lightning strike or transient overvoltage, the protective assembly instantly conducts to safeguard internal insulating components from breakdown damage.

Typical Application

Buried natural gas, crude oil and product pipelines, compressor stations and valve yards. Used to separate catholically-protected pipe segments from unprotected sections.