In industrial piping and flanged connections, particularly in cathodic protection systems and environments prone to stray electrical currents, a critical component is often the unsung hero of safety and longevity: the Flange Insulation Gasket Kits. These specialized kits are engineered to prevent galvanic corrosion, isolate electrical currents, and ensure the structural integrity of pipeline systems. For engineers and maintenance professionals working in oil & gas, chemical processing, water treatment, and marine applications, specifying the correct insulation kit is not an option—it's a fundamental requirement for operational safety and compliance.
At Kaxite Sealing, we have developed a comprehensive range of high-performance Flange Insulation Gasket Kits designed to meet the most demanding international standards. Our kits provide complete dielectric isolation, effectively breaking the electrical continuity between flanged joints to stop corrosive electrochemical reactions and protect personnel and equipment.
A Flange Insulation Gasket Kit is a complete assembly used to electrically isolate two flanged pipe sections or a flanged connection to equipment. It does more than just seal against fluid leakage; it creates a barrier to the flow of electrical current. A typical kit from Kaxite Sealing includes all necessary components for a fully insulated joint:
By incorporating all these elements, Kaxite Sealing kits ensure a reliable, maintenance-free insulated joint that withstands pressure, temperature, and environmental challenges.
Our product line is categorized based on flange type, pressure rating, and service temperature. We utilize only premium, proven materials to guarantee performance.
| Component | Standard Material | Key Properties & Alternatives |
|---|---|---|
| Dielectric Gasket | Glass Reinforced Epoxy (GRE) / G10 | High dielectric strength, excellent compressive strength. Alternatives: PTFE, PEEK, or Composite Elastomeric sheets for specific chemical resistance. |
| Insulating Sleeves | PTFE (Teflon®) or PVDF | Chemically inert, low friction, excellent insulation. GRE sleeves for high-load applications. |
| Insulating Washers | PTFE, Phenolic, or GRE | High dielectric and compressive strength. Chosen based on bolt load and temperature. |
| Steel Washers | Carbon Steel (Zn plated) or 316 Stainless Steel | Provides load distribution. Material selected based on environmental corrosivity. |
| Fasteners (Bolts & Nuts) | Typically supplied by client per specification | Kits are designed to fit standard ASME/EN bolt dimensions. Coated or stainless steel recommended. |
| Kit Series | Pressure Rating (ANSI Class) | Temperature Range | Dielectric Strength (min) | Typical Flange Sizes | Primary Applications |
|---|---|---|---|---|---|
| KXI-150 Standard | 150# / PN20 | -50°C to 120°C (-58°F to 248°F) | 5 kV/mm | 1/2" to 24" (DN15 to DN600) | Water pipelines, low-pressure gas, general plant piping. |
| KXI-300 Industrial | 300# / PN50 | -50°C to 150°C (-58°F to 302°F) | 8 kV/mm | 1/2" to 48" (DN15 to DN1200) | Oil & gas gathering, chemical processing, medium-pressure steam. |
| KXI-600 High-Pressure | 600# / PN100 | -29°C to 200°C (-20°F to 392°F) | 10 kV/mm | 1/2" to 16" (DN15 to DN400) | Process lines, wellhead connections, high-pressure utility lines. |
| KXI-Chem (PTFE Based) | 150# / PN20 | -200°C to 260°C (-328°F to 500°F) | 6 kV/mm | 1/2" to 12" (DN15 to DN300) | Highly corrosive service, pharmaceutical, high-purity chemical lines. |
All Kaxite Sealing kits are designed to conform to ASME B16.5, B16.47, EN 1092-1, and other relevant flange standards. Custom kits for special flanges (e.g., lap joint, insulated spacer) are available upon request.
Q: When is a Flange Insulation Gasket Kit required?
A: These kits are mandatory in several scenarios: 1) At isolation joints in pipelines with cathodic protection systems to define the protected section. 2) Between dissimilar metal flanges (e.g., carbon steel to stainless steel) to prevent galvanic corrosion. 3) In piping connected to sensitive electrical equipment to isolate stray currents. 4) In hazardous areas where spark prevention is critical. Compliance with standards like NACE SP0286 or ASME B31.3 often dictates their use.
Q: Can I just use an insulating gasket without the sleeves and washers?
A: No, this is a common and serious mistake. The electrical current will simply find a path through the bolts, rendering the insulating gasket useless. A complete kit from Kaxite Sealing is essential to break all potential metallic paths across the flange joint.
Q: How do I select the right kit material (e.g., GRE vs. PTFE)?
A: Material selection depends on service conditions. GRE (G10) is standard for most applications due to its high strength and good temperature resistance. Choose PTFE-based kits (like our KXI-Chem series) for aggressive chemicals, very high purity lines, or extreme low temperatures. Our technical team can assist based on your fluid, temperature, pressure, and cleanliness requirements.
Q: What is the proper installation procedure for these kits?
A: Correct installation is crucial. Clean flange faces thoroughly. Insert the insulating sleeves into the bolt holes. Place the dielectric gasket centrally. Assemble bolts with insulating washers and steel washers in the correct order (steel washer against the nut/bolt head, insulating washer against the flange). Tighten bolts in a star-pattern sequence to the specified torque value to ensure even compression without cracking the insulating components.
Q: How do I test if an installed insulated flange is working correctly?
A: The standard field test is a continuity or resistance check using a multimeter. With the kit properly installed, you should measure very high electrical resistance (typically > 1 megohm) across the isolated flange joint. A low resistance reading indicates a fault, such as a missing insulating component, a crushed sleeve, or conductive debris in the joint.
Q: Are Kaxite Sealing kits suitable for high-temperature applications above 200°C?
A: Our standard KXI-600 series is rated to 200°C. For higher temperatures, we offer specialized solutions using materials like PEEK or ceramic-filled composites. Please contact our engineering department with your specific temperature and pressure parameters for a custom design.
Q: Do you provide kits for non-standard or large diameter flanges?
A: Yes. Kaxite Sealing specializes in custom-engineered insulation solutions. We can manufacture kits for any flange size, including large-diameter ANSI, API, or custom flanges, as well as for special geometries like insulated spacer rings for full-bore isolation.
