DESCRIPTION
Spiral wound gaskets have the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange face temperature variations, flange rotation, bolt stress relaxation and creep.
The gasket sealing element consists of a pre-formed metallic winding strip with layers of a softer, more compressible sealing material which, during compression, is densified and flows to fill imperfections in the flange surfaces when the gasket is seated. The metal strip holds the filler giving the gasket mechanical resistance and resilience.
The outer ring of the spiral prevents blow outs and simplifies fitting the gasket. The inner ring acts as an additional heat shield when subjected to high temperatures. Spiral wound gaskets are also easy to fit as well as remove and will not damage a flange face.
STOCK
In stock with the construction of:
Carbon outer/ 316 stainless inner/ Graphite filled
Sizes ½” to 24”
ALL PRESSURES AND TEMPERATURES ARE SUBJECT TO INDIVIDUAL APPLICATION
CONSTRUCTIONS OF SPIRAL WOUNDS
|
FILLER MATERIAL
|
MAX. TEMPERATURE
|
ASME B16.20 COLOUR
CODING
|
|---|---|---|
| Graphite | 500°C | Grey Stripe |
| PTFE | 260°C | White Stripe |
| Nonas | 350°C | Pink Stripe |
| Mica | 1000°C | Light Green |
| Mica & Graphite, Zonal | 900°C | N/A |
|
WINDING MATERIAL
|
MAX. TEMPERATURE
|
ASME B16.20 COLOUR CODING
|
|---|---|---|
| 304 Stainless Steel | 650°C | Yellow |
| 316L Stainless Steel | 800°C | Green |
| Duplex | 800°C | N/A |
| 347 Stainless Steel | 870°C | Blue |
| 321 Stainless Steel | 870°C | Turquoise |
| Monel 400 | 800°C | Orange |
| Nickel 200 | 600°C | Red |
| Titanium | 540°C | Purple |
| Hastelloy B – 2 | 1000°C | Brown |
| Hastelloy C – 276 | 1000°C | Beige |
| Inconel 600 | 1000°C | Gold |
| Inconel 625 | 1000°C | Gold |
| Inconel X – 750 | 1000°C | Light Grey |
| Incoloy 825 | 1000°C | White |
| Zirconium 702 | 500°C | N/A |
GREEN = OUTER RING
BLACK = WINDING
GREY = INNER RING
TYPE CRIR
- Solid metal inner & outer ring
- Suitable for high pressure and temperature applications
- Raised face or flat flanges
- Prevents turbulence and erosion damage to flange
- Prevents damage to the gasket bore and inner windings
- Acts as a heat shield
- Acts as a corrosion barrier
- General and critical duties
OTHER CONSTRUCTION TYPES ARE AVAILABLE ON REQUEST