Every year, pipeline operators lose millions to galvanic corrosion, cathodic protection system failures, and unplanned downtime caused by electrical current crossing bolted flange joints. When dissimilar metals meet at a flange connection, electrolytic action accelerates metal loss—and without proper isolation, your entire cathodic protection system can be compromised.
The Flange Insulation Gasket Kit solves this problem at the source. It is a complete, ready‑to‑install assembly that electrically isolates flanged connections, blocks stray currents, and preserves your cathodic protection system. No component hunting. No installation guesswork. Just proven corrosion protection that keeps your pipelines operating safely and profitably.
Why risk expensive pipe replacement when a $200 isolation kit can prevent it?
The Flange Insulation Gasket Kit (also referred to as a Flange Isolation Kit or Insulating Flange Gasket) is a precision‑engineered assembly designed to electrically isolate flanged pipe connections in critical industrial applications across oil & gas, petrochemical, refining, offshore, and water treatment sectors.
When two flanges of dissimilar metals are bolted together, an electrochemical cell is created. Moisture and electrolytes complete the circuit, and galvanic corrosion begins – eating away at the less noble metal. In cathodically protected systems, the same electrical path can drain protective current away from the pipeline, reducing system efficiency and accelerating corrosion elsewhere.
The Flange Insulation Gasket Kit breaks this electrical path. The central insulating gasket separates the flange faces. The insulating sleeves isolate the bolts from the flange bolt holes. The insulating washers prevent the nuts from contacting the flange surface. The result: complete electrical isolation across the joint.
| Type | Flange Face | Description |
|---|---|---|
| Type E | Flat Face (FF) / Full Face | Gasket OD matches flange OD, with bolt holes. Prevents foreign material from bridging the insulation gap. |
| Type F | Raised Face (RF) | Ring‑style gasket covering only the raised face. Tight fit ensures centered positioning. |
| Type D | Ring‑Type Joint (RTJ) | Fits directly into the ring groove. Available in oval and octagonal shapes. |
| Material | Dielectric Strength (volts/mil) | Water Absorption (%) | Max. Temp. (°C) | Compressive Strength (PSI) |
|---|---|---|---|---|
| Plain Phenolic | 500 | 1.6 | 107 | 25,000 |
| Neoprene‑faced Phenolic | 500 | 1.6 | 79 | 25,000 |
| G10/G11 Epoxy Glass | 550 | 0.1 | 138–177 | 50,000 |
| Reinforced PTFE | 350 | 0.01 | 260 | 2,300 |
| G7 Silicone Glass | 350 | 0.07 | 232 | 40,000 |
| Material | Dielectric Strength (volts/mil) | Water Absorption (%) | Max. Temp. (°C) | Compressive Strength (PSI) |
|---|---|---|---|---|
| Phenolic Resin | 500 | 1.6 | 149 | 33,000 |
| G10/G11 Epoxy Glass | 550 | 0.1 | 138 | 50,000 |
| Mylar (Polyester Film) | 4,000 | 0.8 | 149 | — |
| Polyethylene | 400 | 0.01 | 82 | — |
| Standard Size Range | ½″ to 24″ (DN15 – DN600) |
| Custom Size Range | Up to 48″ (DN1200) or larger |
| Pressure Classes | Class 150, 300, 600, 900, 1500, 2500 |
| Applicable Standards | ASME B16.5, B16.47, B16.21, AWWA C207, API, BS, DIN |
Naming Convention Example: FLNGINSGASKET KIT 4" CL 150 B16.5 RF — 4‑inch, Class 150, ASME B16.5, Raised‑Face flange insulation gasket kit.
Strict quality control at every stage – from raw material incoming inspection to final dielectric testing and dimensional verification.
Every kit includes material certificates and test reports (dielectric strength, pressure testing) with complete batch traceability.
Supplying oil & gas operators, EPC contractors, and distributors across North America, Europe, Southeast Asia, and the Middle East.
Non‑standard sizes up to 48″, special materials, unique pressure ratings – our engineering team develops your exact solution.
Standard: 7–15 days. Bulk: 15–25 days. Samples (2″–8″): 5 days. No supply chain excuses.
Material selection guidance, installation instructions, and responsive after‑sales support with product quality guarantee.
Q1: What is the MOQ for flange insulation gasket kits?
A: Standard sizes: 5–10 sets. Custom sizes, large diameters, or special materials – MOQ is negotiable. Contact us with your requirements.
Q2: Can I get a sample before bulk ordering?
A: Yes. Sample kits (2″–8″) ship within 5 working days. Sample costs may be credited toward your first production order.
Q3: What certifications are available?
A: Standard: ISO 9001:2015, ASME B16.5/B16.20/B16.21, ASTM F436, CE. Optional: API 6FB, ISO 14001, ISO 45001.
Q4: What is your standard lead time?
A: Standard sizes: 7–15 working days. Custom/bulk: 15–25 days. Samples: 5 working days.
Q5: Do you support custom sizes or materials?
A: Yes. Custom sizes up to 48″ (DN1200), custom material combinations, and non‑standard pressure ratings. Provide your specifications and we will develop a solution.
Q6: How do I choose between Type D, E, or F?
A: Type E for flat face/full face flanges. Type F for raised face flanges. Type D for ring‑type joint (RTJ) flanges. Send us your flange specification and we will recommend the correct kit.
Q7: What warranty do you provide?
A: Product quality guarantee with full technical support. Specific terms vary by application – contact us for details.
Q8: Do you offer OEM/private labeling?
A: Yes. Custom packaging and labeling with your brand. Minimum quantities apply – discuss with our team.
Q9: Which industries do you supply?
A: Oil & gas, petrochemical, refining, offshore platforms, water/wastewater, LNG, hydrogen transport, and industrial piping systems.
Q10: Can I get installation guides and test reports?
A: Yes. We provide installation instructions, dielectric test reports, pressure test reports, and material certificates with every order.
Don't wait until galvanic corrosion damages your flanges, compromises your cathodic protection, or forces an expensive pipeline replacement.
Get a quote today and receive:
✅ Competitive pricing based on your volume
✅ Expert material selection guidance
✅ Fast lead times (samples in 5 days)
✅ Full certification and documentation package
Contact us now – Tell us your project requirements and we will respond within 24 hours with a tailored proposal.
