Insulating Gaskets

Overview

Insulating gaskets are designed to electrically isolate flanged pipe joints while maintaining effective sealing performance. They are a key component of flange insulation kits used to protect piping systems against corrosion caused by stray electrical currents and electrolytic reactions.

Function & Purpose

• Provides electrical insulation between flanged connections
• Prevents galvanic and electrolytic corrosion
• Controls stray electrical currents in piping systems
• Improves the effectiveness of cathodic protection systems
• Maintains leak-tight sealing under compression

Flange Insulation Kits

Insulating gaskets are commonly supplied as part of flange insulation kits, which typically include:

• Insulating gasket
• Insulating sleeves for bolts
• Insulating washers
• Steel backup washers (as required)

Materials

• Phenolic laminate
• Epoxy-coated glass fiber (G10 / G11)
• PTFE-based insulating materials
• Rubber-faced insulating gaskets

Sealing Characteristics

• High dielectric strength for effective electrical isolation
• Good resistance to pressure and temperature variations
• Compatible with various flange standards
• Designed to prevent fluid leakage while insulating

Applications

• Oil and gas pipelines
• Water distribution systems
• Refineries and petrochemical plants
• Chemical processing facilities
• Power generation plants
• Underground and above-ground piping systems

Operating Benefits

• Extends pipeline service life by reducing corrosion
• Minimizes maintenance and repair costs
• Enhances safety and system reliability
• Supports compliance with corrosion control standards

Important Notes

• Material selection should consider pressure, temperature, and chemical exposure
• Proper installation is critical to ensure both sealing and electrical isolation
• Commonly used in conjunction with cathodic protection systems