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Spiral Wound Gasket with Outer Centering Ring

Spiral Wound Gasket with Outer Centering Ring

The material for the Spiral Wound Gasket with Outer Centering Ring can be Stainless Steel 316L, Stainless Steel 304, Stainless Steel 310, Stainless Steel 316Ti, Stainless Steel 347, Monel 400, Inconel 625 steel.

Content

Spiral Wound Gasket with Outer Centering Rings - Style SN 500 - CG

Spiral Wound Gasket with Outer Centering Ring is the one of popular type of spiral wound gasket, this type of gasket construction is that one winding ring with an outer centering ring. Spiral wound gasket with outer centering ring works by using an outside ring which accurately centers gasket on flange face, offers further radial strength to prevent gasket blow-out and works as a compression stop. It is suitable for use with flat face and raised face flanges up to and inclusive of class 2500.

The gasket can be offered according to EN1514-2 for use with DIN flange systems, EN12560-2 for use with flange systems according to EN1759-1 or ASME B16.5, ASME B16.20 for use with flange systems ASME B16.5, ASME B16.47 series A for use with flange systems according to ASME B16.47 series A and ASME B16.47 series B for use with flange systems according to ASME B16.47 series B.

What Makes the Spiral Wound Gasket So Popular?

This kind of gasket is super suitable for using the condition of high temperature, high pressure, and corrosive applications. It also allow a wide variety of available gasket materials combined for different industries, can satisfy anyone's need. And the v-shaped metal strip which called the winding, mixed with a filler like Graphite or PTFE to gain excellent sealing effect and quality, makes the gasket be a perfect seal.

The Most 4 Common Types of Spiral Wound Gasket

CG Style (Spiral Wound Gasket with Outer Centering Ring)

It is one of the most widely used and also widely available configuration of spiral wound gaskets. CG Style gaskets have a reliable metal ring over the outer diameter known as the centering guide (CG). This guide makes it possible for the installer to more accurately center the gasket on the flange face while supplying durability on the outer ring. CG style gaskets are widely-used with both flat and raised-face flanges in a wide variety of program.


CG Spiral Wound Gasket with Outer Centering Ring


CGI Style (Spiral Wound Gasket with Inner and Outer Centering Ring)
Just like the CG Style referred to above, CGI gaskets come with an outer ring, in addition they provide an inner ring safeguarding the inner diameter of the gasket against heat, corrosion as well as blow-outs making it ideal in vacuum programs. CGI Style gaskets may be used with both flat and raised-face flanges.

CGI Style (Spiral Wound Gasket with Inner and Outer Centering Ring)


R Style (Spiral Wound Gasket without inner or outer ring)

The most basic setup of spiral wound gaskets, the R-Style includes only stainless steel winding and the filler elements. The inner and outside diameter are generally strengthened by several layers of the winding material minus the filler. The inner part of the R-style gasket is comprised of winding and filler material. This fashion is commonly used with tongue and groove, flat-faced to grooved, and male to female flange connectors. They are also regularly employed in valve bonnets and pump casings.

R Style (Spiral Wound Gasket without inner or outer ring)


RIR Style (Spiral Wound Gasket with Inner Ring) 

It Is similar to the R-Style gasket in its simple construction but comes with an inner liner ring that acts as a support. The inner ring makes a pressure stop and fills the void between the inner diameter of the gasket and the flange bore. This minimizes the deposition of solids and reduces turbulence of fluids. RIR Design gaskets are widely-used on male along with female flange connectors.


RIR Style (Spiral Wound Gasket with Inner Ring)


Spiral Wound Gasket Selected Material

Metal Winding Ring 
Gasket Inner Ring Materials Outer Centering Ring  Graphite Winding Filler

V Shape or W-shape stainless steel

Stainless Steel 316L
Stainless Steel 304
Stainless Steel 310
Stainless Steel 316Ti
Stainless Steel 347
Monel 400
Nickel 200
Inconel 600
Inconel 625
Inconel X750
Incoloy 800
Incoloy 825
Hastalloy B2

Stainless steel 316L
Stainless Steel 304
Stainless Steel 310
Stainless Steel 316Ti
Stainless Steel 347
Monel 400
Nickel 200
Inconel 600
Inconel 625
Inconel X750
Incoloy 800
Incoloy 825
Hastalloy B2
Carbon Steel
Stainless steel 304
Stainless Steel 316L
Stainless Steel 321
Stainless Steel 347
Stainless Steel 410
Monel 400
Nickel 200
Inconel 600
Incoloy 800
Incoloy 825
Hastalloy B2
Hastalloy C276
Titanium
Alloy 20

Flexible Graphite

Non-asbestos 

Mica Tape

Ceramic

PTFE



Spiral Wound Gasket Torque Value Chart

To Set Up and make use of the spiral wound gasket effectively, we need to be aware of torque beliefs since it is vital. Torque principles restrict bare minimum and optimum gasket sitting stresses based upon various pressure school in accordance with ASME B16.20 common and a number of working situations. (greatest stress ratings for provided stress type, not hydro analyze strain). Extreme running situations for example substantial temperatures may decrease bolt deliver durability. Care should be employed in these programs. The below torque beliefs are for basic use only. For essential or intense apps (substantial temperatures and stress), consult with us for more information.

Flange Size (inch)

Suggested Torque Value (Ft-Lbs) for CGI Spiral wound gasket with inner and outer ring
Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500
1/2 30-50 30-40
30-40
30-40
70-120 70-120
50-100
3/4 30-50
60-80 60-70
60-80
70-120
70-120
50-100
1 30-60 60-80 60-80
60-80
170-290 110-190 110-160
1 1/2 30-60 100-140 100-140 100-140
110-190 290-310 310-360
2 60-120 60-80 60-80
60-80
110-190 130-190 220-250
2 1/2 60-120 100-140
100-150
100-140
170-290 190-290 300-360
3 90-120 100-150
100-120
100-150
140-230 265-360 460-500
3 1/2 60-120 100-170
160-290 170-290


4 70-120 100-200 160-320 190-320 255-420 415-520 710-800
5 100-200 110-200 210-320 280-490 360-600 585-800 1280-1500
6 130-200 110-200 190-320 260-460 300-500 530-680 1870-2200
8 180-200 180-320 310-490 400-700 485-800 850-1100 1780-2200
10 170-320 250-460 360-710 500-800 505-800 1570-2000 3000-4400
12 240-320 360-700 510-1000 500-850 570-850 1500-2200 4610-5920
14 300-490 360-610 500-870 680-950 630-940 1500-2200
16 310-490 500-920 680-1250 800-1210 910-1290 2120-3180
18 490-710 500-1000 680-1340 1100-1790 1570-2340 2940-4400
20 430-710 500-1000 800-1430 1100-1640 1740-2570 5150-7720
24 620-1000 800-1600 1500-2270 2000-2670 2945-5140 8340-12500


Spiral Wound Gasket Manufacturing Process

From the time 1912, the asbestos spiral wound gasket was invented and used. Till now different stainless steel materials, and sealing element fillers such as ptfe, graphite, mica and other non-asbestos materials, safer and better sealing effect. And different types of spiral wound gasket invented, but the 3 key structures for spiral wound gasket will be always: Inner Ring, Outer Centering Guide Ring and Sealing Element also called Winding Ring.

Below is the process and methods to prouce Inner Ring, Outer Centering Guide Ring and Sealing Element.

1 - Inner and Outer Ring

The inner and outer ring can be manufactured by below 2 methods.

A. For the inner ring and outer centering ring of spiral wound gasket, the first method is cutting out the metal ring from stainless steel sheet by using a punch press, water jet or laser cutting machine when the ring gasket below 150 to 200 mm diameter. After the ring comes out, then put onto a lathe where a convex profile can be machined onto the outer diameter edge for inner rings, also a concave profile is machined onto to inner diameter edge for outer rings. 

B. The second method is that use Spiral Wound Gasket Ring Bending machine to bend the stainless steel tape into the correct radius of the spiral wound gasket inner or outer ring, then cut the excess length of the tape by a bandsaw to get a right circle size of the ring. And then form the tape into a complete gasket ring by spiral wound gasket automatic welding machine, and sand down the gasket ring to be a smooth ring. After this use a spiral wound gasket angling machine to machine the inner ring for a convex profile, a spiral wound gasket grooved machine machine the outer ring for a concave profile. This method need more lot of time and need the workers quite skilled, but after use our advanced spiral wound gasket machine, you will easily produce the spiral wound gasket inner and outer ring.

2 - Sealing Element or Called Winding Ring

Why spiral wound gasket called this name? As it has a sealing element called winding ring, it is manufactured by spirally winding a V-shaped or W shaped stainless steel strip and a strip of non-metallic filler such as PTFE or Graphite. The metal strip holds the filler, providing the gasket with mechanical resistance and resilience. So now let's learn more about how to manufacture the sealing element ring.

The sealing element is produced by 2 types of spiral wound gasket winding machine, a vertical winding process for smaller diameters below 300mm, and a horizontal spiral wound gasket winding machine process for larger diameter over 300mm. Both processes are identical other than the orientation of the winding process. Except for the direction of the winding process, the two processes are the same, But a horizontal Spiral Wound Gasket winding machine has the capability of producing big size sealing elements, but it requires more floor space.

The process begins by setting an inner ring or on the main driving component of the spiral wound gasket winding machine. This machine will rotate the inner ring which will provide the necessary pulling force required to wind the sealing element. And then long metal strip will be fed into a set of profile rollers and then pulled towards the inner ring. After some circules with the inner ring, the metal winding filler and soft material filler such as graphite or ptfe together combine the sealing element. The process ends till reach enough size for the sealing element needs

3. Assembly

To finish a CGI type spiral wound gasket with inner and outer ring, or CG style spiral wound gasket with outer centering guide ring, the final stage is to snap the outer ring on around the sealing element. This is done by simply guiding the outer profiled edge of sealing element into profiled concave groove of the outer ring. If required, a mallet can be used to lightly tap the sealing element into the groove.

Also, after assembling, the outer ring need to be marked as standard or customers' need.