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Klingersil C4400 Isolation Gasket
QS Gasket: Klingersil C4400 Isolation Gasket
Name: Klingersil C4400 Isolation Gasket
Standard: ASME B16.5
Material: Klingersil C4400
Max Temperature: 400℃
Size: 8 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Standard: ASME B16.5
Material: Klingersil C4400
Max Temperature: 400℃
Size: 8 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Quantity
Klingersil C4400 Isolation Gasket takes an aramid-fibre-reinforced NBR-composite sheet as its core, couples it with G10 insulating sleeves and washers, and thereby delivers a dual guarantee of electrical isolation plus sealing at 400 °C, 150 LB. Stocked in 8"ASME B16.5, it is the first-choice safety solution for harsh services such as petro-chemical plants, offshore platforms and electrolysers.
What are the absolute temperature and pressure limits of the C-4400 gasket?
Klingersil C4400 Isolation Gasket (C-4400 gasket) is a general-purpose non-asbestos sheet compressed from aramid fibres and nitrile rubber (NBR). Balancing temperature, pressure and chemical compatibility, it is widely used for flange sealing in petro-chemicals, power generation, ship-building, paper and food industries. The two limits are explained separately below, with field-oriented data points for clarity.
Klingersil C4400 Isolation Gasket (C-4400 gasket) is a general-purpose non-asbestos sheet compressed from aramid fibres and nitrile rubber (NBR). Balancing temperature, pressure and chemical compatibility, it is widely used for flange sealing in petro-chemicals, power generation, ship-building, paper and food industries. The two limits are explained separately below, with field-oriented data points for clarity.
I. Temperature limits
1. Peak short-term temperature: ≈ 400 °C
This is the temperature Klingersil C4400 Isolation Gasket can survive for minutes to a few hours, typically during emergency shutdowns or steam-outs. The fibre skeleton remains intact, but the NBR suffers noticeable oxidative weight-loss and its recovery drops; long-term operation at this extreme is therefore not recommended.
1. Peak short-term temperature: ≈ 400 °C
This is the temperature Klingersil C4400 Isolation Gasket can survive for minutes to a few hours, typically during emergency shutdowns or steam-outs. The fibre skeleton remains intact, but the NBR suffers noticeable oxidative weight-loss and its recovery drops; long-term operation at this extreme is therefore not recommended.
2. Continuous safe temperature: ≈ 175 °C
Between 150 °C and 175 °C the aramid fibres decompose very slowly and the NBR cross-link density changes only acceptably. Klingersil C4400 Isolation Gasket keeps > 50 % recovery and < 20 % thickness loss, so most plants treat 175 °C as the day-after-day, year-after-year upper limit.
Between 150 °C and 175 °C the aramid fibres decompose very slowly and the NBR cross-link density changes only acceptably. Klingersil C4400 Isolation Gasket keeps > 50 % recovery and < 20 % thickness loss, so most plants treat 175 °C as the day-after-day, year-after-year upper limit.
3. Steam caveat: ≈ 200–220 °C
Saturated steam both plasticises and extracts NBR. Experience shows that above 220 °C Klingersil C4400 Isolation Gasket blisters and loses binder. If bolt load is raised 20 % and a sheet < 1.5 mm is used, the gasket can safely handle ~ 210 °C in 16 bar(g) saturated-steam lines, but life is usually only 12–18 months.
Saturated steam both plasticises and extracts NBR. Experience shows that above 220 °C Klingersil C4400 Isolation Gasket blisters and loses binder. If bolt load is raised 20 % and a sheet < 1.5 mm is used, the gasket can safely handle ~ 210 °C in 16 bar(g) saturated-steam lines, but life is usually only 12–18 months.
II. Pressure limits
1. Laboratory peak: 50 MPa (≈ 7 250 psi)
Per DIN 52913, 2 mm sheet held at 300 °C for 16 h still retains 25 MPa residual compressive stress, showing that Klingersil C4400 Isolation Gasket has not collapsed.
1. Laboratory peak: 50 MPa (≈ 7 250 psi)
Per DIN 52913, 2 mm sheet held at 300 °C for 16 h still retains 25 MPa residual compressive stress, showing that Klingersil C4400 Isolation Gasket has not collapsed.
2. Field recommendation: 40 bar (≈ 580 psi)
Taking flange rigidity, bolt stretch and field temperature swings into account, KLINGER, Garlock and others list 40 bar in their data sheets, covering PN10–PN40 and Class 150/300 flange series; the same figure applies to Klingersil C4400 Isolation Gasket.
Taking flange rigidity, bolt stretch and field temperature swings into account, KLINGER, Garlock and others list 40 bar in their data sheets, covering PN10–PN40 and Class 150/300 flange series; the same figure applies to Klingersil C4400 Isolation Gasket.
3. Instant shock: up to 65 bar
At 23 °C on flanges with Ra ≤ 3.2 µm, hydro-tests can be short-term bumped to 65 bar without leakage. Once temperature exceeds 100 °C, however, the maximum allowable pressure for the same thickness of Klingersil C4400 Isolation Gasket falls roughly 1:1.5, dropping to about 25 bar at 300 °C.
At 23 °C on flanges with Ra ≤ 3.2 µm, hydro-tests can be short-term bumped to 65 bar without leakage. Once temperature exceeds 100 °C, however, the maximum allowable pressure for the same thickness of Klingersil C4400 Isolation Gasket falls roughly 1:1.5, dropping to about 25 bar at 300 °C.
III. Down-to-earth examples
- Ex. 1: Atmosphere tower overhead line in a refinery, 160 °C / 12 bar design, 1 mm Klingersil C4400 Isolation Gasket. After three years’ run the gasket still showed good recovery and no permeation leak.
- Ex. 1: Atmosphere tower overhead line in a refinery, 160 °C / 12 bar design, 1 mm Klingersil C4400 Isolation Gasket. After three years’ run the gasket still showed good recovery and no permeation leak.
- Ex. 2: 12 bar(g) saturated-steam main in a paper mill, 192 °C. Former graphite composite delaminated after frequent blow-outs. Switching to 1.5 mm Klingersil C4400 Isolation Gasket and raising bolt torque 15 %, the 18-month shutdown revealed only surface micro-cracks; seal level still DIN 3535-6, class V-0.
- Ex. 3: Offshore fire-water pump hydro-tested at 1.5 × rating, 50 bar ambient, 30 min hold, 2 mm Klingersil C4400 Isolation Gasket showed no tear-drop leakage, meeting API 6A PSL2 temporary seal demand; but if the platform required 70 bar continuous duty, a metal-reinforced sheet would be needed.
IV. Take-away
- Treat 175 °C / 40 bar as the “all-weather” safe box for Klingersil C4400 Isolation Gasket.
- Treat 175 °C / 40 bar as the “all-weather” safe box for Klingersil C4400 Isolation Gasket.
- Occasional steam-outs can reach 210 °C, yet pressure must simultaneously be lowered to ~ 16 bar.
- 400 °C and 50 MPa are laboratory survival extremes, not service figures.
- Temperature and pressure must be considered together: for every 50 °C rise, allowable pressure is roughly halved.
Follow the rule “temperature first, pressure follows”, add flange stiffness, bolt load and medium aggressiveness, and Klingersil C4400 Isolation Gasket will deliver its best cost-effective performance inside the safe envelope.
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