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In demanding industrial environments, achieving a reliable, leak-free seal under high pressure and temperature conditions is paramount. For decades, one solution has consistently proven its effectiveness across countless applications: the Spiral Wound Gasket. This engineered sealing component is the cornerstone of safe and efficient operations in industries ranging from oil and gas and petrochemicals to power generation and pharmaceuticals. At Kaxite Sealing, we leverage over two decades of expertise to design and manufacture spiral wound gaskets that meet the most stringent international standards and performance requirements. Understanding their construction, specifications, and proper application is key to selecting the right gasket for your system's integrity.
A spiral wound gasket is a semi-metallic sealing element created by winding a pre-formed metal strip and a filler material (typically non-metallic) in a V-shaped spiral. This winding process occurs around a central metal ring (inner ring) and is often contained by an outer metal ring. This unique construction combines the resilience and sealing properties of the filler material with the structural strength and temperature resistance of the metal winding. The result is a highly adaptable gasket capable of accommodating system pressures, thermal cycling, and flange irregularities far better than many flat gasket types.
The performance of a spiral wound gasket is directly tied to its materials of construction. Kaxite Sealing offers a wide range of material combinations to suit specific service conditions.
Selecting the correct spiral wound gasket requires precise attention to dimensional and performance parameters. Kaxite Sealing gaskets are manufactured to exact customer prints and comply with major global standards such as ASME B16.20, API 601, EN 1514-2, and DIN standards.
| Nominal Pipe Size (NPS) | Class (Pressure Rating) | Inner Diameter (ID) mm | Outer Diameter (OD) mm | Winding Width (W) mm | Thickness (T) mm |
|---|---|---|---|---|---|
| 2" | 150 | 60.5 | 127.0 | 10.0 | 4.5 |
| 4" | 300 | 110.5 | 190.5 | 15.0 | 4.5 |
| 10" | 600 | 273.0 | 381.0 | 22.0 | 4.5 |
| 16" | 900 | 438.0 | 584.0 | 25.0 | 4.5 |
The maximum working pressure of a spiral wound gasket depends on the flange class, material combination, and temperature. The gasket itself does not have a pressure rating independent of the flange. It is designed to seal effectively at the pressure-temperature limits defined by the ASME B16.5 flange standard for the corresponding class and material group. Kaxite Sealing provides detailed P-T rating charts based on the specific metal and filler combination selected.
Q: When should I use a spiral wound gasket instead of a soft cut gasket?
A: Spiral wound gaskets are the preferred choice for medium to high-pressure applications (typically Class 150 and above), high temperatures (exceeding the limits of rubber or PTFE), and for flanges that experience thermal cycling or slight misalignment. They are also mandatory for raised face (RF) and ring-type joint (RTJ) flanges in critical service per most engineering standards. Soft gaskets are suitable for low-pressure, low-temperature, and full-face flanges.
Q: How do I identify the correct spiral wound gasket for my flange?
A: You need the following information: Flange Standard (e.g., ASME B16.5), Nominal Pipe Size (NPS), Pressure Class (e.g., 150#, 300#), Flange Face Type (RF, RTJ, etc.), and the Service Conditions (fluid media, temperature, pressure). With this data, a supplier like Kaxite Sealing can specify the correct gasket size, material combo (like SS316/Flexible Graphite), and appropriate guiding rings.
Q: What is the purpose of the inner and outer rings on a spiral wound gasket?
A: The inner ring (centering ring) prevents the spiral winding from being blown inward into the pipeline, which could cause erosion or blockage. It also provides radial stability. The outer ring (centering ring) makes handling easier, centers the gasket perfectly between bolt holes during installation, and provides additional resistance against the winding being blown out under extreme pressure. Not all gasket styles require an outer ring.
Q: Can a spiral wound gasket be reused after it has been compressed?
A: It is strongly discouraged to reuse a spiral wound gasket. During the initial bolting, the gasket undergoes plastic deformation and compression to conform to the flange surfaces. Reusing a compressed gasket compromises its resiliency and recovery properties, significantly increasing the risk of a leak upon re-tightening or during the next operational cycle. Always install a new gasket for guaranteed seal integrity.
Q: How does Kaxite Sealing ensure the quality of its spiral wound gaskets?
A: At Kaxite Sealing, quality is integral to our manufacturing process. We start with certified raw materials from reputable mills. Our CNC winding machines ensure precise control over density, width, and thickness. Every production batch undergoes rigorous inspection, including dimensional checks against customer specifications, visual examination for consistency, and material traceability documentation. For critical applications, we can provide material test certificates (MTCs) and conduct additional tests as required.
Q: What are the storage and handling best practices for spiral wound gaskets?
A: Store gaskets in a clean, dry, temperature-controlled environment away from direct sunlight and corrosive fumes. Keep them in their original packaging until ready for use to prevent dust, grease, or physical damage (nicks, dents). Handle them with care, avoiding any bending or dropping. Always inspect the gasket visually for any defects immediately before installation.
Q: Are there special installation torque procedures for spiral wound gaskets?
A: Yes, proper bolt torque is critical. Always follow a cross-pattern bolting sequence (star pattern) to apply pressure evenly across the flange face. Use multiple passes (e.g., 30%, 60%, 100% of final torque) to gradually compress the gasket. The final target torque should be calculated based on the bolt size, grade, lubrication, and the required gasket seating stress. Under-torquing can cause leaks; over-torquing can crush the gasket or damage the flange.
The versatility of spiral wound gaskets makes them indispensable in numerous sectors. Kaxite Sealing provides solutions tailored to each industry's unique challenges.
Choosing Kaxite Sealing means more than just purchasing a gasket; it means securing a partnership with a dedicated sealing specialist. Our commitment extends beyond manufacturing:
0086-574-87527773
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China