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RILSON GASKET
Ningbo Rilson Sealing Material Co., Ltd is dedicated to ensuring the secure and dependable operation of fluid sealing systems, offering clients the appropriate sealing technology solutions.
A corrugated metal gasket is a sealing element formed from a sheet of metal with corrugated patterns. It elastically deforms to fill small gaps between flanges or joints, and is widely used for sealing in high-temperature, high-pressure, and highly corrosive environments. The following is an analysis of its key points:
1. Structure and Types of Corrugated Metal Gaskets
- Basic Structure
Metal Base Material: Stainless steel (304/316), copper, titanium, nickel-based alloys, etc.
Corrugation Shape: Continuous waves, serrations, or concentric circles to enhance elastic compensation.
Surface Treatment: Soft coatings such as graphite and PTFE (polytetrafluoroethylene) can be applied to enhance sealing performance.
- Common Types
|
Types |
Features |
Applications |
|
Pure Metal Corrugated Gasket |
Uncoated, High-Temperature Resistance (≤800°C) |
Boilers, Petrochemical High-Temperature Pipes |
|
Coated Corrugated Gasket |
Graphite/PTFE Coated Surface for a Tighter Seal |
Chemical Corrosion, Food Equipment |
|
Serrated Metal Gasket |
Corrugated + Serrated Structure for Strong Pressure Resistance |
High-Pressure Flanges (PN 40 and Above) |
2. Core Functions and Advantages
- Key Functions
Dynamic Sealing: Compensates for flange surface unevenness or thermal expansion and contraction through elastic deformation of the corrugations.
Compression and Creep Resistance: The metal base can withstand higher pressures (up to 100 MPa) than non-metallic gaskets.
Extreme Environment Resistance: Suitable for high temperatures (-200°C to +800°C), strong acids, alkalis, and radiation.
- Advantages Compared to Other Gaskets
|
Comparison Items |
Corrugated Metal Gaskets |
Rubber Gaskets |
Asbestos Gaskets |
|
Heat Resistance |
800°C |
≤120°C |
≤500°C |
|
Pressure Resistance |
100 MPa |
10 MPa |
20 MPa |
|
Lifespan |
5-10 years |
1-3 years |
2-5 years |
|
Environmentally Friendly |
Recyclable |
Degradable |
Contains carcinogenic asbestos fibers |
3. Selection and Installation Key Points
- Key Selection Parameters
Material: Select based on the corrosiveness of the medium (e.g., 316L for chloride ion resistance, Hastelloy for sulfuric acid resistance).
Corrugation Density: High-frequency corrugations offer excellent elasticity, while low-frequency corrugations offer high pressure resistance.
Thickness: Typically 0.2-3mm. Thinner corrugations can easily collapse, while thicker ones may result in insufficient springback.
- Installation Precautions
Flange Preparation: Clean the surface, remove burrs, and ensure a flatness of ≤0.05mm.
Bolt Pre-Tightening: Tighten gradually in a diagonal order to avoid stress concentration on one side.
Pressure Testing: First, perform a low-pressure leak test, then gradually increase the pressure to 1.5 times the operating pressure.
