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For decades, Spiral Wound Gaskets have stood as the industry benchmark for reliable sealing in the most demanding fluid containment applications. These gaskets masterfully combine flexibility with high mechanical strength, making them the preferred choice for engineers and maintenance professionals across oil & gas, chemical processing, petrochemical, power generation, and marine sectors. At Kaxite Seals, we leverage advanced manufacturing techniques and rigorous quality control to produce spiral wound gaskets that deliver uncompromising performance, ensuring safety, preventing costly downtime, and extending the operational life of your critical flange connections.
The fundamental design of a spiral wound gasket is an engineering marvel. It is constructed by winding a pre-formed metal strip (the windings) and a soft filler material in a V-shape around a central metal ring (the centering ring), creating a resilient, semi-metallic seal. This structure provides a unique "spring-like" action: when compressed under bolt load, the gasket conforms to flange surface imperfections, while the inherent resilience of the wound structure maintains a tight seal despite fluctuations in internal pressure, temperature, and bolt stress caused by thermal cycling.
The performance of a spiral wound gasket is dictated by its material composition and precise physical dimensions. Kaxite Seals offers a vast array of standard and custom options to meet exact specifications.
The choice of winding metal and filler material is critical and depends on the service conditions (media, temperature, pressure).
| Component | Common Materials | Key Properties & Typical Applications |
|---|---|---|
| Metal Windings |
|
Provides structural strength and spring-back. Selection is based on corrosion resistance and temperature limits. 316SS is the most common for general chemical service, while high-nickel alloys like Inconel are used for extreme temperatures and corrosive environments. |
| Filler Material |
|
Provides the primary sealing element, filling micro-gaps. Flexible graphite excels in high temperatures and offers excellent chemical resistance (excluding strong oxidizers). PTFE is for cryogenic to moderate temperatures with broad chemical compatibility. Mica is for very high-temperature, oxidizing atmospheres. |
| Centering Ring |
|
Provides radial stability, guides proper gasket placement within the bolt circle, prevents over-compression, and often includes an inner pilot for positive location. The material is typically selected based on environmental conditions and compatibility with the flange. |
Every Kaxite spiral wound gasket is manufactured to precise dimensional standards to ensure a perfect fit and optimal seal.
| Style | Description | Typical Application |
|---|---|---|
| Style 1002 (Inner Ring) | Features a centering ring on the inside diameter (ID) only. The outer diameter (OD) is flush with the windings. | Most common style for standard raised face (RF) flanges. The inner ring prevents windings from being eroded into the pipeline. |
| Style 1003 (Inner & Outer Ring) | Includes centering rings on both the ID and the OD, fully encapsulating the wound element. | Used for tongue-and-groove (T&G) and male-female (M&F) flange faces. Provides maximum protection and stability. |
| Style 1004 (No Rings - Plain) | Consists solely of the wound metal and filler without any outer rings. | Primarily used for flat face (FF) flanges or in confined spaces where ring clearance is an issue. |
Q: When should I use a spiral wound gasket instead of a soft cut gasket (e.g., rubber, compressed non-asbestos)?
A: Spiral wound gaskets from Kaxite Seals are recommended for medium to high-pressure/temperature applications, for critical service involving hazardous or expensive fluids, and for flanges subject to significant thermal cycling. Soft gaskets are suitable for low-pressure, low-temperature, and non-critical static seals on smooth surfaces. If your application involves pressures above 150 psi, temperatures above 200°C (400°F), or cyclic conditions, a spiral wound gasket is typically the more reliable and cost-effective long-term choice.
Q: How do I select the correct metal and filler material for my application?
A: Selection requires analyzing three key factors: the chemical compatibility of the media with both metal and filler, the continuous and peak operating temperatures, and the system pressure. First, consult chemical resistance charts for the candidate materials against your process fluid. Second, ensure the materials' temperature limits exceed your operating range. Finally, the winding density and gasket thickness are chosen based on pressure. Kaxite Seals provides comprehensive technical support and selection guides to assist with this critical process.
Q: Can spiral wound gaskets be reused?
A: It is strongly discouraged to reuse a spiral wound gasket. During initial installation and compression, the filler material embeds into the flange surfaces and the metal windings undergo plastic deformation to achieve the seal. Removing the gasket disturbs this "set," and its ability to re-seal effectively is drastically compromised. Reuse significantly increases the risk of leakage. Always install a new, certified Kaxite spiral wound gasket during any flange assembly.
Q: What is the proper installation torque for a spiral wound gasket?
A: The correct bolt torque is not a single value but follows a specific procedure to ensure even compression. Use the ASME PCC-1 "Guidelines for Pressure Boundary Bolted Flange Joint Assembly" as a best practice reference. The general steps are: 1) Hand-tighten all bolts. 2) Use a crisscross pattern to torque bolts to 30% of the final target torque. 3) Repeat the pattern at 60% of the final torque. 4) Perform a final pass at 100% torque in a circular pattern. The final torque value depends on bolt size, grade, gasket style, and service conditions. Kaxite can provide recommended seating stress values for our gaskets to help calculate appropriate torque.
Q: What is the purpose of the inner ring on a spiral wound gasket?
A: The inner ring (centering ring on the ID) serves multiple vital functions. Primarily, it prevents the inward buckling or erosion of the soft wound element into the pipeline, which is crucial for maintaining flow and preventing contamination. Secondly, it acts as a compression stop, preventing over-compression of the windings which could crush them and destroy their resilience. Finally, it aids in centering the gasket on the flange during installation.
Q: How does Kaxite Seals ensure the quality of its spiral wound gaskets?
A: Kaxite Seals implements a full quality management system. Every production batch uses certified raw materials with traceability. The winding process is controlled by precision CNC machines for consistent density and geometry. Our gaskets undergo 100% dimensional inspection. Furthermore, we perform batch testing for critical parameters like crush resistance and recovery. Certificates of Conformance (C of C) and Material Test Reports (MTR) are available to provide full traceability and assurance that the product meets the specified standards and your purchase order requirements.
