China Manufacturer of SS304 Spiral Wound Gasket with Inner & Outer Rings SS304 Graphite CGI ASME B16.20

What is Spiral Wound Gasket?

Spiral Wound Gasket shorten as SWG,which is a sealing material for Pipe flanges.

A Spiral Wound Gasket (SWG) is a type of industrial gasket that is widely used in high-temperature, high-pressure, and corrosive environments. It consists of a V-shaped metal strip and a softer filler material that is wound in a spiral fashion to create a resilient sealing surface

The spiral wound gasket is semi-metallic, comprising of a spirally wound v-shaped stainless steel strip and a non-metallic filler material, such as graphite or PTFE. Also on the gasket, is a solid outer ring used for centering and controlling compression. This minimizes the risk of material creep through over-tightening.

How to identify metal and filler materials . The image below shows the marking and structure of the spiral wound gasket

Spiral Wound Gasket Identificiation structure

What is SS304 FG in gasket?

FG is shorten by Flexible graphite

A soft, adaptable material that can be used to make sealing sheets for gaskets. These sheets can be unreinforced, or reinforced to create a multilayer sheet called a graphite laminate.
SS304 wind material for gasket which is a Flat or V or W-Shape Metallic tape
Grade 304 stainless steel is a versatile alloy with 18% chromium and 8% nickel that enhances it corrosion resistance performance.

Chemical Composition (ASTM A240)

SX oC Mn P S Si Cr Ni
304
304L		 0.08 max
0.03 max		 2.0
max		 0.045
max		 0.030
max		 1.0
max		 18.0 to
20.0		 8.0 to 10.50
8.0 – 12.0

Mechanical Properties at Room Temperature

 

304 304L
Typical Minimum Typical Minimum
Tensile Strength,    MPa 600 515 590 485
Proof Strength, (Offset 0.2 %),              MPa 310 205 310 170
Elongation (Percent in 50mm) 60 40 60 40
Hardness (Brinell) 170 – 170 –
Endurance (fatigue) limit,                      MPa 240 – 240 –

 

R Type Spiral Wound Gasket

Basic Type

* Basic construction type, inner and outer diameters are reinforced with several piles of metal without filler to give greater stability and better compression characteristics.

* Recommended flange tongue and groove, male to female and flat face to recess.

* General and critical duties.

IR Type Spiral Wound Gasket

Inner Ring Type

* Solid inner metal ring acts as a compression stopper. To prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion, damages of gasket between flange bore and the inside diameter, the annular space is filled up by solid inner metal ring.

* Suitable for male and female pipe flanges.

* General duties.

CG Type Spiral Wound Gasket

Outer Ring Type

* Solid outer ring accurately locates the gasket on the flange face to give the additional radial strength to prevent the gasket blowout and acts as a compression limiter. In case of installing the outer ring, it is very easy to install the gasket to flange face because the end of outer ring will touch at bolts.

* Suitable for use with flat face and raised face flanges. For class 900 and above an internal ring is recommended.

* General and critical duties.

CGI Type Spiral Wound Gasket

Inner & Outer Rings Type

* A inner ring and outer ring type gasket will give an additional compression limiting stopper for gasket inner and outer side. It will prevent the corrosions on flange face at annular space.

* Suitable for use with flat face and raised face flanges and specified for high pressure / temperature service – Class 900 and above or where corrosive or toxic media are present.

* General and critical duties.

SS304 Spiral Wound Gasket order specification

Product : Metal Wound Gasket
Type: CGI
Size : 8 Inch
Design Pressure : 900LB
Material of Ring: SS304 Inner Ring and Carbon Steel Outer Ring
Material of Base Ring: SS304 Hoop Filled with Flexible Graphite
Manufacture Standard: ASME B16.20