Spiral Wound Gasket – Offers High Compressibility and Recovery
Spiral Wound Gasket is composed of a steel outer ring, a spiral wound sealing strip filler and a special steel inner ring. It is created by winding alternating strips of metal and filler material.
Outer guide ring is fitted to centralise the gasket between the bolts and to act as a compression limiter. Inner ring is fitted to reduce the gap between the inside diameter of the gasket and the bore of the flange.
It is widely used in moderate to critical services in various industries. They are most suitable for the gaskets subject to extreme temperature or pressure cycling, shock or vibration. These gaskets have the best resistance property when compare with other metal and asbestos type gaskets.
Types
- Centering gasket (Style CG). Utilizes an external ring which accurately centers gasket on flange face. It provide an additional radial strength to prevent the gasket blow-out and acts as a compression stop. A general purpose gasket suitable for both flat face and raised face flanges.
- Centering gasket with inner ring (Style CGI). This style is similar to style CG, but it additionally consists of an inner ring. The outer ring is used for centering and the internal ring used as an additional compression limiting stop. The internal ring also serves as a barrier to protect the gasket from heat and corrosion.
- Reinforced spiral wound gasket (Style R). It is a basic configuration of spiral wound gasket. The Inner and outer diameters are reinforced with several plies of metal without filler to give greater stability and better compression and sealing characteristics.
- Reinforced inner ring spiral wound gasket (Style RIR). This style of the gasket, the solid inner metal ring acts as a compression stop and fills the annular space between flange bore and the inside diameter of the gasket. It is designed to prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion at flange faces.
Style CG spiral wound gasket
Style CGI spiral wound gasket
Style R spiral wound gasket
Style RIR spiral wound gasket
Common specifications
- Thickness : 0.125", 0.175", 0.25", 0.285"
- Lower temperature Rating: -450 °F
- Upper temperature Rating: 850 °F
- Maximum pressure: 150 psi
- PH: 0–14
- Class: 150–2500
| Pipe size (inch) |
150, 300, 400, 600 |
900, 1500, 2500 |
| ID (inch) |
OD (inch) |
ID (inch) |
OD (inch) |
| 1/4 |
1/2 |
7/8 |
- |
- |
| 1/2 |
3/4 |
1-1/4 |
3/4 |
1-1/4 |
| 3/4 |
1 |
1-9/16 |
1 |
1-9/16 |
| 1 |
1-1/4 |
1-7/8 |
1-1/4 |
1-7/8 |
| 1-1/4 |
1-7/8 |
2-3/8 |
1-9/16 |
2-3/8 |
| 1-1/2 |
2-1/8 |
2-3/4 |
1-7/8 |
2-3/4 |
| 2 |
2-3/4 |
3-3/8 |
2-5/16 |
3-3/8 |
| 2-1/2 |
3-1/4 |
3-7/8 |
2-3/4 |
3-7/8 |
| 3 |
4 |
4-3/4 |
3-3/4 |
4-3/4 |
| 3-1/2 |
4-1/2 |
5-1/4 |
4-1/8 |
5-1/4 |
| 4 |
5 |
5-7/8 |
4-3/4 |
5-7/8 |
| 4-1/2 |
5-1/2 |
6-1/2 |
5-5/16 |
6-1/2 |
| 5 |
6-1/8 |
7 |
5-13/16 |
7 |
| 6 |
7-3/16 |
8-1/4 |
6-7/8 |
8-1/4 |
| 8 |
9-3/16 |
10-3/8 |
8-3/4 |
10-1/8 |
| 10 |
11-5/16 |
12-1/2 |
10-7/8 |
12-1/4 |
| 12 |
13-3/8 |
14-3/4 |
12-3/4 |
14-1/2 |
| 14 |
14-5/8 |
16 |
14 |
15-3/4 |
| 16 |
16-5/8 |
18-1/4 |
16-1/4 |
18 |
| 18 |
18-11/16 |
20-3/4 |
18-1/4 |
20-1/2 |
| 20 |
20-11/16 |
22-3/4 |
20-1/2 |
22-1/2 |
| 24 |
24-3/4 |
27 |
24-3/4 |
26-3/4 |
Features
- Durable, easy installation and removal.
- Inner ring can help shield sealing elements from erosion caused by abrasive media.
- It can adjust to temperature changes, shock, and vibration, and can be used at fairly high temperatures and pressures.
- Available in wide ranges of materials for various services.
- Chemical resistance.
- Extra-long shelf life
Classical applications
- Chemical Industry.
- Steam systems.
- Onshore and offshore exploration.
- Pipeline systems.
- Pressure vessels.
- Power generation.
- Aerospace.
- Oil & gas industry.
- Heat exchangers.
- Compressors.
- Condensers.
- Pumps and valves.
In steam system
In pipeline flange
