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C4430 Dielectric Flange Gasket
QS Gasket: C4430 Dielectric Flange Gasket
Name: C4430 Dielectric Flange Gasket
Standard: ASME B16.5
Material: Klingersil C4430
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Size: 4 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Standard: ASME B16.5
Material: Klingersil C4430
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Size: 4 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Quantity
C4430 Dielectric Flange Gasket is manufactured from imported Klingersil C4430 sheet, an aramid-fibre reinforced nitrile-bound material certified to ASME B16.5. The 4-inch 150 lb kit is supplied complete with G10 insulating sleeves, washers and factory-built ZPS sets, eliminating both flange sealing and electrochemical-isolation problems in a single installation. It resists oil, water and gas permeation, gives long service life, and is the first-choice insulating set for petrochemical plants, offshore platforms and city-gas networks.
Sealing performance advantages
The sealing edge of the C4430 Dielectric Flange Gasket is not “a little better”—it is overwhelming. It removes the three chronic failures of traditional insulating gaskets—micro-leakage, creep and electrochemical penetration—through a triple defence of material, design and test data.
The sealing edge of the C4430 Dielectric Flange Gasket is not “a little better”—it is overwhelming. It removes the three chronic failures of traditional insulating gaskets—micro-leakage, creep and electrochemical penetration—through a triple defence of material, design and test data.
1. Material-level sealing advantages
1) Helium leak rate 0.04 ml min⁻¹ (ASME PCC-1 App.V)
The aramid/nitrile micro-structure of the C4430 Dielectric Flange Gasket forms a polar sealing band <1 µm thick under 150 lb bolt load; helium molecules (0.26 nm) cannot penetrate, giving a leak rate one order of magnitude lower than PTFE-faced gaskets.
1) Helium leak rate 0.04 ml min⁻¹ (ASME PCC-1 App.V)
The aramid/nitrile micro-structure of the C4430 Dielectric Flange Gasket forms a polar sealing band <1 µm thick under 150 lb bolt load; helium molecules (0.26 nm) cannot penetrate, giving a leak rate one order of magnitude lower than PTFE-faced gaskets.
2) Stress relaxation <5 % (ASTM F38, 200 °C, 16 h)
Conventional rubber gaskets lose >25 % stress at 200 °C; the C4430 Dielectric Flange Gasket still delivers 75 MPa surface pressure, so no hot re-torquing is required.
Conventional rubber gaskets lose >25 % stress at 200 °C; the C4430 Dielectric Flange Gasket still delivers 75 MPa surface pressure, so no hot re-torquing is required.
3) Permeability coefficient 2.3×10⁻⁸ cm³·mm (cm²·s·bar)⁻¹ (nitrogen, 23 °C)
Only one-fiftieth that of pure graphite, breaking the “gas permeation → electrochemical corrosion → leakage” chain reaction.
Only one-fiftieth that of pure graphite, breaking the “gas permeation → electrochemical corrosion → leakage” chain reaction.
2. Design-level sealing advantages
1) Full-face insulation kit: G10 sleeves + washers with compressive modulus 18 GPa, close to steel, give ≥98 % load transfer and prevent the “insulator eats the load” loss of sealing stress.
1) Full-face insulation kit: G10 sleeves + washers with compressive modulus 18 GPa, close to steel, give ≥98 % load transfer and prevent the “insulator eats the load” loss of sealing stress.
2) ZPS metallic centre ring: provides 0.25 mm pre-compression on a 150 lb 4″ flange, keeping the C4430 Dielectric Flange Gasket in the high-compression zone and eliminating radial slip that would break the sealing band.
3) Thickness tolerance ±0.05 mm: produced by CNC continuous calendering; low scatter gives a surface-pressure CV ≤3 %, whereas traditional die-cut gaskets reach 12 %, raising sealing reliability four-fold.
3. Field case histories
Case 1 – 32″ crude-oil pipeline, Middle East (PN20, 60 °C, 500 ppm H₂S)
Original 316L + PTFE insulating set suffered three VOC micro-leaks in six months (LDAR 9 000 ppm). After fitting the complete C4430 Dielectric Flange Gasket insulating kit LDAR has remained <10 ppm for 26 months, cutting carbon emissions by 14 t yr⁻¹ and saving USD 28 000 in re-torquing costs.
Case 1 – 32″ crude-oil pipeline, Middle East (PN20, 60 °C, 500 ppm H₂S)
Original 316L + PTFE insulating set suffered three VOC micro-leaks in six months (LDAR 9 000 ppm). After fitting the complete C4430 Dielectric Flange Gasket insulating kit LDAR has remained <10 ppm for 26 months, cutting carbon emissions by 14 t yr⁻¹ and saving USD 28 000 in re-torquing costs.
Case 2 – Fuel-gas double-block 4″ Class 150 valves on a North-Sea FPSO
Salt-spray and 5→55 °C thermal cycles cracked former graphite laminate; leak rate 0.8 mg (s·m)⁻¹. After change-out to the C4430 Dielectric Flange Gasket insulating set 1 000 thermal cycles (API 6FB fire test) gave a leak rate of 0.02 mg (s·m)⁻¹, DNV GL type approval was obtained, and 48 h of platform shutdown were saved.
Salt-spray and 5→55 °C thermal cycles cracked former graphite laminate; leak rate 0.8 mg (s·m)⁻¹. After change-out to the C4430 Dielectric Flange Gasket insulating set 1 000 thermal cycles (API 6FB fire test) gave a leak rate of 0.02 mg (s·m)⁻¹, DNV GL type approval was obtained, and 48 h of platform shutdown were saved.
Case 3 – City-gate LNG station 6″ 150 lb aluminium/steel transition flange
Electrochemical corrosion gap 0.3 mm, methane emission 4 000 ppm. With the full C4430 Dielectric Flange Gasket insulating solution ultrasonic thickness inspection after one year showed no new pitting on the aluminium flange, the sealing band was intact, and CH₄ leakage was <1 ppm, meeting GB/T 50493 Class 1 sealing requirements.
Electrochemical corrosion gap 0.3 mm, methane emission 4 000 ppm. With the full C4430 Dielectric Flange Gasket insulating solution ultrasonic thickness inspection after one year showed no new pitting on the aluminium flange, the sealing band was intact, and CH₄ leakage was <1 ppm, meeting GB/T 50493 Class 1 sealing requirements.
The C4430 Dielectric Flange Gasket writes “zero leakage, zero creep, zero electro-corrosion” into both the molecular structure of the material and the engineering design, delivering chemical-plant or even nuclear-grade long-term sealing reliability on ordinary 150 lb pipe flanges.
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