Productscpzx
Introduction to Spiral Wound Gaskets
Spiral wound gaskets are sealing gaskets formed by alternately winding metal strips and non-metallic filler strips. They combine the strength of metal with the sealing properties of non-metallic materials, making them high-performance sealing components widely used in industrial pipelines and equipment.
Core Characteristics
| Characteristic | Description | Advantages |
| Excellent Sealing Performance | Multiple sealing barriers with metal and non-metal material combination | Suitable for high-temperature and high-pressure conditions |
| Good Elastic Compensation | Wound structure allows compression and rebound | Adapts to uneven flange surfaces |
| High Temperature and Pressure Resistance | Maximum operating temperature up to 800°C, pressure up to 25MPa | Suitable for harsh working conditions |
| Resistance to Creep and Relaxation | Metal strips provide mechanical strength and resist sustained loads | Maintains long-term sealing stability |
| Multiple Material Combinations | Metal and filler materials can be selected based on the medium | Adapts to various corrosive environments |
Basic Structure
| Component | Material Options | Function |
| Metal Strip | 304/316 stainless steel, Inconel, titanium alloy, etc | Provides mechanical strength and elasticity |
| Filler Material | Graphite, PTFE, ceramic fiber, etc. | Provides primary sealing function |
| Inner and Outer Rings | Usually same material as metal strip | Positioning and reinforcement |
Type Classification
| Type | Structural Features | Applicable Standards | Applications |
| Basic Type | No inner or outer rings | ASME B16.20 | Tongue-and-groove flange faces |
| Inner Ring Type | With inner ring | EN 1092-1 | Raised face flanges |
| Outer Ring Type | Outer Ring Type | DIN 2696 | Flat face flanges |
| Inner and Outer Ring Type | With both inner and outer rings | JB/T 90 | High-pressure applications |
Performance Parameters Table
| Performance Indicator | Graphite Filler | PTFE Filler | Ceramic Fiber Filler | Test Standard |
| Operating Temperature (°C) | -200~800 | -200~260 | -200~1100 | ASTM F38 |
| Operating Pressure (MPa) | ≤25 | ≤10 | ≤20 | ASME B16.20 |
| Compression Rate (%) | 18~30 | 15~25 | 20~35 | ASTM F36 |
| Recovery Rate (%) | ≥17 | ≥15 | ≥20 | ASTM F36 |
| Stress Relaxation Rate (%) | ≤15 | ≤20 | ≤18 | ASTM F38 |
Selection Guide
1. Material Selection Principles:
· Metal strip material should be equal to or better than flange material
· Filler material must be compatible with process medium
· Consider temperature and pressure fluctuations
2. Size Determination:
· Determine gasket size according to flange standards
· Consider bolt load and flange stiffness
· Reserve appropriate compression space
3. Special Condition Considerations:
· Use more elastic materials for thermal cycling conditions
· Use advanced alloy materials for corrosive environments
· Special treatment required for ultra-high vacuum environments
Installation and Usage Requirements
1. Pre-Installation Inspection:
· Flange sealing surfaces should be clean and undamaged
· Confirm correct gasket model and materials
· Check if gasket is intact and undamaged
2. Installation Specifications:
· Use positioning tools to ensure alignment
· Tighten bolts gradually in diagonal sequence
· Achieve specified bolt preload
3. Maintenance Recommendations:
· Regularly check bolt tightness
· Re-tighten after thermal cycling
· Inspect gasket compression status during shutdown
Application Fields
1. Petrochemical Industry: Reactors, heat exchangers, pipeline flanges
2. Power Industry: Steam turbines, boiler systems
3. Refining Units: Hydrocracking, catalytic cracking units
4. Nuclear Power Industry: Nuclear-grade equipment sealing
5. Aerospace: Engine pipeline systems
Spiral wound gaskets, with their unique structure and excellent sealing performance, are the preferred sealing elements for high-temperature and high-pressure conditions. Through reasonable material selection and correct installation, they can provide reliable long-term sealing for various industrial equipment. Their flexibility in multi-material combinations allows them to adapt to extreme conditions ranging from cryogenic to high-temperature and high-pressure environments.
