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O Ring Colour Identification

O rings come in various colours, and it's important to understand what these colours indicate as the o rings you choose will affect your overall process application.  Ultimately, different o ring colours are used to help differentiate between different materials. ...

Spiral Wound Gasket Compressibility and Pressure Ratings

In order to form a reliable seal, spiral wound gaskets do require a certain degree of pressure.   The applied pressure allows the gasket to be compressed tightly between the mating surfaces preventing any leaks from occurring.  Factors such as operating temperature...

Elastomeric Compounds

What is elastomer?  Elastomeric compounds are rubber seals produced using natural rubbers or manufactured by the chemicals industry.  Elastomeric sealing compounds consist of between 50-60% rubber; the remainder of the compound consists of fillers,...

Is there such a thing as the right flange gasket?

We cannot stress enough how important gaskets and seals can be. Gaskets are vital for an application's reliability and integrity, and trust us when we say, choosing the right gasket now can help you avoid costly issues in the future.  Taking a closer look at pipe...

Plastic gaskets, the best alternative to metal

Plastic gaskets and seals are not that uncommon.  In fact, they’re used in many devices due to the longevity and functionality they offer.  Helping to prevent leaks and maintain temperature control, plastic gaskets help equipment and appliances operate to the best of...

Protecting your seals

Dust gets everywhere.  We see it across the surfaces of our homes and even in our workplaces, especially when the light shines through to show it in its full glory!  However, dust that seeps and builds up within engineering equipment can be disastrous.  Causing damage...

Importance of durometer testing

Durometer or shore durometer is a way for industry professionals to measure how hard such things as plastic, rubber, and non-metallic materials genuinely are.  Its focus is to measure on a Shore A or Shore D scale, looking at how robust material is when examining its...

Metal Detectable O Rings

Metal detectable o rings became a necessary must when it was identified that some chemicals, exposure to extreme temperatures, and continuous vibrations could cause failings in standard o rings.  Failings that not only mean a breaking of the seal, but there is also an...

Tips for best o ring maintenance

If o rings are not maintained, leaks can occur, and water and other fluids can enter the appliance or application, and even product in the mix!  If this happens, damage can occur to internal parts and mechanisms, causing deployment failings, potential false readings,...

What you need to know about O Ring Lubricants

Silicone grease and lubricants aren’t just a nice to have for o rings, but they can quite often be a must-have.  However, with so many greases and lubricants to choose from, it can often be a minefield choosing the best ones and the right ones for your o ring and...

Spiral Wound Gaskets

The Spiral Wound Gasket is a very versatile sealing product and has considerable mechanical strength and recovery characteristics. It is of semi-metallic configuration and capable of sealing a wide range of media across a range of Pressure (upto 450 Bar) and Temperature (-250 to +1000C)  applications 

Spiral Wound Gaskets can be used with various flange face configurations and it is this that ultimately determines what style of gasket is required.

Spiral Wound Gasket Styles

The main characteristic of the Spiral Wound Gasket is the sealing element itself which is manufactured by spirally winding a ‘V’ shaped metallic strip and incorporating a soft filler, generally Graphite, PTFE or specially developed High Temperature material and it is this that maintains an effective seal at varying temperatures and pressures.

The Spiral Wound Gasket configuration can also include an outer and inner ring. The Outer ring acts as a locator within the bolt circle and also as a compression stop supporting the sealing element and resisting ‘blow-out’ by preventing over-compression whilst the inner ring acts as a heat shield and corrosion barrier to protect the actual spiral element from media attack.

Material construction generally depends on the application conditions, predominantly media, temperature and pressure values, the most common construction being 316 Stainless Steel Winding and Inner Ring, a Carbon Steel Outer Ring and Graphite Filler Material.

Applications and Benefits of a Spiral Wound Gasket

  • Accommodates a high variation in Temperature Range
  • Accommodates a high range in Pressure
  • Used in Pipelines, Valves, Pumps and Thermal Exchanges

Industries Served

  • Petrochemical
  • Pharmaceutical
  • Nuclear Energy
  • Oil and Gas
  • Offshore
  • Marine
  • Pump and Valve

Installation

The Gasket Outer Ring fits within the Flange Bolts thus locating the gasket centrally on the raised face. The Outer Ring acts as a compression stop preventing over-compression of the sealing element avoiding potential ‘blow-out’. The Inner Ring acts as a barrier, preventing media attack.

Typical Filler Materials are

GRAPHITE 

  • For use with Hydrocarbons, Oil, many Chemicals  and Steam Service. 
  • 450C > 400 bar 

PTFE 

  • Oxygen Clean Service 
  • Resistant to virtually all Chemicals 
  • 260C > 100 bar 

MICA 

  • High temperature and High Pressure Applications 
  • 1000C >100 bar 
Spiral Wound Drawing
Spiral Wound  Type SOI

SOI

This is the most common type of Spiral Wound Gasket, having both an Inner and Outer Guide Ring. Generally used for Raised Face and Flat Face Flange applications

Spiral Wound Type SO

SO

This gasket is supplied with just an outer ring and may sometimes be used in similar applications to the SOI, though generally not preferred

Spiral Wound Type SI

SI

This style of Spiral Wound incorporates only an Inner Ring and is generally used in Male to Female Flange applications

Spiral Wound Type S

S

Used in Tongue and Groove, male to female and flat to recess flanges. Often seen in Valve bonnet and Exchanger applications.

Spiral Wound Gasket Material Configurations

Spiral Wound Gasket Drawing

Winding / Inner / Outer Ring Material CombinationsMaximum Temperature ASME B16.20 Colour Coding
Carbon Steel 500⁰C Silver
304 Stainless Steel 550⁰C Yellow
316/L Stainless Steel 550⁰C Green
316 Ti Stainless Steel 650⁰C Light Blue
321 Stainless Steel 650⁰C Turquoise
347 Stainless Steel 650⁰C Blue
Duplex 800⁰C N/A
Nickel 200 600⁰C Red
Monel 400 600⁰C Orange
Titanium 350⁰C Purple
Hastelloy B-2 450⁰C Brown
Hastelloy C-276 450⁰C Beige
Inconel 600 950⁰C Gold
Inconel 625 450⁰C Gold
Inconel X-750 1000⁰C Light Grey
Incoloy 825 450⁰C White

 

Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 150 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
½14.219.131.847.8
¾20.625.439.657.2
126.931.847.866.8
38.147.860.576.2
44.554.169.985.9
255.669.985.9104.9
66.582.698.6124.0
381.0101.6120.7136.7
4106.4127.0149.4174.8
5131.8155.7177.8196.9
6157.2182.6209.6222.3
8215.9233.4263.7279.4
10268.2287.3317.5339.9
12317.5339.9374.7409.7
14349.3371.6406.4450.9
16400.1422.4463.6514.4
18449.3474.7527.1549.4
20500.1525.5577.9606.6
24603.3628.7685.8717.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 300 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
½14.219.131.854.1
¾20.625.439.666.8
126.931.847.873.2
1 ¼38.147.860.582.6
1 ½44.554.169.995.3
255.669.985.9111.3
2½ 66.582.698.6130.3
381.0101.6120.7149.4
4106.4127.0149.4181.1
5131.8155.7177.8215.9
6157.2182.6209.6251.0
8215.9233.4263.7308.1
10268.2287.3317.5362.0
12317.5339.9374.7422.4
14349.3371.6406.4485.9
16400.1422.4463.6539.8
18449.3474.7527.1596.9
20500.1525.6577.9654.1
24603.3628.7685.8774.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 600 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
½14.219.131.854.1
¾20.625.439.666.8
126.931.847.873.2
1 ¼38.147.860.582.6
1 ½44.554.169.995.3
255.669.985.9111.3
2 ½66.582.698.6130.3
378.7101.6120.7149.4
4102.6120.7149.4193.8
5128.3147.6177.8241.3
6154.9174.8209.6266.7
8205.7225.6263.7320.8
10255.3274.6317.5400.1
12307.3327.2374.7457.2
14342.9362.0406.4492.3
16389.9412.8463.6565.2
18438.2469.9527.1612.9
20489.0520.7577.9682.8
24590.6628.7 685.8790.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 900 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
½14.219.131.863.5
¾20.625.439.669.9
126.931.847.879.5
33.339.660.588.9
41.447.869.998.6
252.358.785.9143.0
63.569.998.6165.1
378.795.3120.7168.4
4102.6120.7149.4206.5
5128.3147.6177.8247.7
6154.9174.8209.6289.1
8196.9222.3257.3358.9
10246.1276.4311.2435.1
12292.1323.9368.3498.6
14320.8355.6400.1520.7
16374.7412.8457.2574.8
18425.5463.6520.7638.3
20482.6520.7571.5698.5
24590.6628.7679.5838.2
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 1500 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
½14.219.131.863.5
¾20.625.439.669.9
126.931.847.879.5
1 ¼33.339.660.588.9
1 ½41.447.869.998.6
252.358.785.9143.0
2 ½63.569.998.6165.1
378.792.2120.7174.8
497.8117.6149.4209.6
5124.5143.0177.8254.0
6147.3171.5209.6282.7
8196.9215.9257.3352.6
10246.1266.7311.2435.1
12292.1323.9368.3520.7
14320.8362.00400.1577.9
16374.7406.4457.2641.4
18425.5463.6520.7704.9
20476.3514.4571.5755.7
24577.9616.0679.5901.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 2500 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
½14.219.131.869.9
¾20.625.439.676.2
126.931.847.885.9
1 ¼33.339.660.5104.9
1 ½41.447.869.9117.6
252.358.785.9146.0
2 ½63.569.998.6168.4
378.792.2120.7196.9
497.8117.6149.4235.0
5124.5143.0177.8279.4
6147.3171.5209.6317.5
8196.9215.9257.3387.4
10246.1270.0311.2476.3
12292.1317.5368.3549.4
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 150 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26654.1673.01704.9774.7
28704.9723.9755.7831.9
30755.7774.7806.5882.7
32806.5825.5860.6939.8
34857.3876.3911.4990.6
36908.1927.1968.51047.8
38958.9977.91019.31111.3
401009.71028.71070.11162.1
421060.51079.51124.01219.2
441111.31130.31178.11276.4
461162.11181.11228.91327.2
481212.91231.91279.71384.3
501263.71282.71333.51435.1
521314.51333.51384.31492.3
541358.91384.31435.11549.4
561409.71435.11485.91606.6
581460.51485.91536.71663.7
601511.31536.71587.51714.5
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 300 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26654.1685.8736.6835.2
28704.9736.6787.4898.7
30755.7793.8844.6952.5
32806.5850.9901.71006.6
34857.3901.7952.51057.4
36908.1955.81006.61117.6
38952.5977.91016.01054.1
401003.31022.41070.11114.6
421054.11073.21120.91165.4
441104.91130.31181.11219.2
461152.71178.11228.91273.3
481209.81235.21286.01324.1
501244.61295.41346.21378.0
521320.81346.21397.01428.8
541352.61403.41454.21492.3
561403.41454.21505.01543.1
581447.81511.31562.11593.9
601524.01562.11612.91644.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 600 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26647.7685.8736.6866.9
28698.5736.6787.4914.4
30755.7793.8844.6971.6
32812.8850.9901.71022.4
34863.6901.7952.51073.2
36917.7955.81006.61130.3
38952.5990.61041.41104.9
401009.71047.81098.61155.7
421066.81104.91155.71219.2
441111.31162.11212.91270.0
461162.11212.91263.71327.2
481219.21270.01320.81390.7
501270.01320.81371.61447.8
521320.81371.61422.41498.6
541378.01428.81479.61555.8
561428.81479.61530.41612.9
581473.21536.71587.51663.7
601530.41593.91644.71733.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 900 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26660.4685.8736.6882.7
28711.2736.6787.4946.2
30768.4793.8844.61009.7
32812.8850.9901.71073.2
34863.6901.7952.51136.7
36920.8958.91009.71200.2
381009.71035.11085.91200.2
401060.51098.61149.41251.0
421111.31149.41200.21301.8
441155.71206.51257.31368.6
461219.21270.01320.81435.1
481270.01320.81371.61485.9
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 150 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26654.1673.1698.5725.4
28704.9723.9749.3776.2
30755.7774.7800.1827.0
32806.5825.5850.9881.1
34857.3876.3908.1935.0
36908.1927.1958.9987.6
38958.9974.91009.71044.7
401009.71022.41063.81095.5
421060.51079.51114.61146.3
441111.31124.01165.41197.1
461162.11181.11224.01255.8
481212.91231.91270.01306.6
501263.71282.71325.61357.4
521314.51333.51376.41408.2
541365.31384.31422.41463.8
561422.41444.81478.01514.6
581478.01500.11528.81579.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 300 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26654.1673.1711.2771.7
28704.9723.9762.0825.5
30755.7774.7812.8886.0
32806.5825.5863.6939.8
34857.3876.3914.4993.9
36908.1927.1965.21047.8
38971.61009.71047.81098.6
401022.41060.51098.61149.4
421085.91111.31149.41200.2
441124.01162.11200.21251.0
461178.11216.21254.31317.8
481231.91263.71311.41368.6
501267.01317.81355.91419.4
521317.81368.61406.91470.2
541365.31403.41454.21530.4
561428.81479.61524.0159+3.9
581484.41535.21573.31655.8
601557.31589.01630.41706.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 600 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26644.7663.7714.5765.3
28685.8704.9755.7819.2
30752.6778.0828.8879.6
32793.8831.9882.7933.5
34850.9889.0939.8997.0
36901.7939.8990.61047.8
38952.5990.61041.41104.9
401009.71047.81098.61155.7
421066.81104.91155.71219.2
441111.31162.11212.91270.0
461162.11212.91263.71327.2
481219.21270.01320.81390.7
501270.01320.81371.61447.8
521320.81371.61422.41498.6
541378.01428.81479.61555.8
561428.81479.61530.41612.9
581473.21536.71587.51663.7
601530.41593.91644.71733.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 900 LB

Spiral Wound Gasket Drawing

NPSInner RingSealingElementOuter Ring
Inside Dia (d1)Inside Dia (d2)Outside Dia (d3)Outside Dia (d4)
26666.8692.2749.3838.2
28717.6743.0800.1901.7
30781.1806.5857.3958.9
32838.2863.6914.41016.0
34895.4920.8971.61073.2
36920.8946.2997.01124.0
381009.71035.11085.91200.2
401060.51098.61149.41251.0
421111.31149.41200.21301.8
441155.71206.51257.31368.6
461219.21270.01320.81435.1
481270.01320.81371.61485.9
Spiral wound Gasket Dimensions : For Gaskets to BS EN 1514-2 To suit BS EN 1092-1 Flanges

Spiral Wound Gasket Drawing

NOM PIPE SIZEINNER RING INSIDE DIAMETERSEALING ELEMENT INSIDE DIAMETERSEALING ELEMENT OUTSIDE DIAMETEROUTER RING OUTSIDE DIAMETER
PN10-PN40PN64-PN160PN10PN16PN25PN40PN63PN100PN160
101824343446464646565656
1523293939515151516161
2028344646616161617272
253541535371717171828282
3243496161828282828787
405056686892929292103103103
5061708686107107107107113119119
657786102106127127127127137144144
809099115119142142142142148154154
100115127143147162162162162174180180
125140152172176192192194194210217217
150167179199203218218224224247257257
175189199225231247247254265277287287
200216228248252273273284284309324324
250267279303307327329340640364391388
300318330354358377384400400424458458
350360376400404437444457457486512
400410422450456488495514514543572
500510522550556593617624624657704
600610622650656695734731731764813
700710722756762810804833833879950
800810830864870917911942942988
90091093096497010171011104210421108
1000101010301074108011241128115411541220
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