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Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. The...

How Do You Recognise a Quality Gasket?

A gasket is a very simple item that is reasonably inexpensive. Considering how gaskets work, you may be facing a costly bill should a gasket fail. Choosing a quality gasket from Specialist Sealing Products helps to create a seal that will last until well after the...

5 Common Gasket Failures

Common Failure Causes  A blown head gasket in a vehicle is something that needs to be fixed promptly. If left untouched, you run the risk of seriously damaging your engine. Knowing what causes gasket failure or gasket problems is the key to gasket failure prevention,...

O-ring Size Guidelines

The performance of an O-ring seal depends largely on two factors— the right material and the right size. However, determining the right size O-ring is usually the hardest part when it comes to choosing the right O-ring for an application.   Unfortunately, selecting...

Tips for Proper O-Ring Installation

  An O-ring is a crucial component of a fluid system, and how it is installed can make or break that system. To ensure the success of an application, O-ring requires not only careful material selection and design but also proper installation procedures. A small...

Why Colour Matters When Choosing Gaskets?

Gasket manufacturers have turned to colour coding gaskets to make the selection and categorisation of the product more accessible.   It is possible to identify the winding and filler materials that were used for fabrication by the colouring of the outer top side of...

Materials that can be Used in Producing Gaskets

Seals and gaskets are meticulously manufactured to be able to withstand the exacting conditions under which they function. Not only does a gasket seal two distinct parts and allow the containment of extreme temperature fluids, steams and gases, but it must meld the...

Choosing the Perfect Gasket for Your Needs

The perfect gasket choice and fit is an essential component of engines, appliances, and industrial machinery projects. They are a fundamental part when engineering anything from power tools to oil drills. A high-quality manufacturer of gaskets and seals will use only...

Manufacturing of High-Quality Gaskets

A large number of engineering and machinery applications use gaskets. This mechanical seal is employed whenever gaps between two or more surfaces are joined together. This process is also required to prevent leakage and withstand the extremes of compression when...

O Ring Materials Selection

This is a quick overview of the various O-Ring materials that are available for applications and found at select UK O-Ring suppliers. When it comes to Specialist Sealing Products, it is a good idea to be clued into every option that is on the market. The materials can...

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 Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½ 14.2 19.1 31.8 47.8
¾ 20.6 25.4 39.6 57.2
1 26.9 31.8 47.8 66.8
38.1 47.8 60.5 76.2
44.5 54.1 69.9 85.9
2 55.6 69.9 85.9 104.9
66.5 82.6 98.6 124.0
3 81.0101.6 120.7 136.7
4 106.4127.0 149.4 174.8
5 131.8155.7 177.8 196.9
6 157.2182.6 209.6 222.3
8 215.9233.4 263.7 279.4
10 268.2287.3 317.5 339.9
12 317.5339.9 374.7 409.7
14 349.3371.6 406.4 450.9
16 400.1422.4 463.6 514.4
18 449.3474.7 527.1 549.4
20 500.1 525.5 577.9 606.6
24 603.3 628.7 685.8 717.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 300 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½ 14.2 19.1 31.8 54.1
¾ 20.6 25.4 39.6 66.8
1 26.9 31.8 47.8 73.2
1 ¼ 38.1 47.8 60.5 82.6
1 ½ 44.5 54.1 69.9 95.3
2 55.6 69.9 85.9 111.3
2 ½ 66.5 82.6 98.6 130.3
3 81.0 101.6 120.7 149.4
4 106.4 127.0 149.4 181.1
5 131.8 155.7 177.8 215.9
6 157.2 182.6 209.6 251.0
8215.9 233.4 263.7 308.1
10 268.2 287.3 317.5 362.0
12 317.5 339.9 374.7 422.4
14 349.3 371.6 406.4 485.9
16 400.1 422.4 463.6 539.8
18 449.3 474.7 527.1 596.9
20 500.1 525.6 577.9 654.1
24 603.3 628.7 685.8 774.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 600 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½14.2 19.1 31.854.1
¾ 20.625.4 39.6 66.8
126.931.8 47.8 73.2
1 ¼ 38.147.860.5 82.6
1 ½44.554.169.995.3
2 55.669.985.9111.3
2 ½66.582.6 98.6 130.3
3 78.7101.6 120.7149.4
4 102.6 120.7149.4 193.8
5128.3147.6 177.8241.3
6 154.9 174.8 209.6266.7
8 205.7 225.6263.7320.8
10255.3 274.6317.5 400.1
12 307.3 327.2 374.7457.2
14342.9362.0406.4492.3
16389.9412.8463.6 565.2
18 438.2469.9 527.1 612.9
20489.0520.7 577.9682.8
24590.6628.7 685.8 790.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 900 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½ 14.219.1 31.8 63.5
¾ 20.625.439.669.9
1 26.931.8 47.879.5
33.339.6 60.5 88.9
41.447.8 69.9 98.6
2 52.358.7 85.9 143.0
63.569.998.6 165.1
3 78.795.3 120.7 168.4
4 102.6120.7149.4 206.5
5 128.3 147.6 177.8 247.7
6 154.9 174.8209.6 289.1
8 196.9 222.3 257.3 358.9
10 246.1 276.4311.2 435.1
12 292.1 323.9 368.3 498.6
14 320.8355.6 400.1 520.7
16 374.7 412.8 457.2 574.8
18 425.5 463.6 520.7 638.3
20 482.6 520.7 571.5698.5
24 590.6 628.7679.5838.2
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 1500 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½14.2 19.131.8 63.5
¾ 20.6 25.4 39.6 69.9
126.9 31.847.8 79.5
1 ¼ 33.3 39.660.5 88.9
1 ½41.447.8 69.9 98.6
2 52.358.7 85.9143.0
2 ½ 63.569.998.6 165.1
378.792.2 120.7 174.8
497.8 117.6 149.4 209.6
5 124.5 143.0 177.8254.0
6147.3 171.5 209.6 282.7
8196.9 215.9 257.3 352.6
10 246.1 266.7 311.2435.1
12292.1 323.9368.3 520.7
14 320.8362.00400.1 577.9
16 374.7406.4457.2 641.4
18 425.5 463.6520.7704.9
20476.3 514.4571.5 755.7
24 577.9 616.0679.5 901.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 2500 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½ 14.2 19.1 31.8 69.9
¾ 20.6 25.4 39.6 76.2
1 26.9 31.8 47.8 85.9
1 ¼ 33.3 39.6 60.5 104.9
1 ½ 41.4 47.8 69.9 117.6
2 52.3 58.7 85.9 146.0
2 ½ 63.5 69.9 98.6 168.4
3 78.7 92.2 120.7 196.9
4 97.8 117.6 149.4 235.0
5 124.5 143.0 177.8 279.4
6 147.3 171.5 209.6 317.5
8 196.9 215.9 257.3 387.4
10 246.1 270.0 311.2 476.3
12 292.1 317.5 368.3 549.4
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 150 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 654.1 673.01 704.9 774.7
28 704.9 723.9 755.7 831.9
30 755.7 774.7 806.5 882.7
32 806.5 825.5 860.6 939.8
34 857.3 876.3 911.4 990.6
36 908.1 927.1 968.5 1047.8
38 958.9 977.9 1019.3 1111.3
40 1009.7 1028.7 1070.1 1162.1
42 1060.5 1079.5 1124.0 1219.2
44 1111.3 1130.3 1178.1 1276.4
46 1162.1 1181.1 1228.9 1327.2
48 1212.9 1231.9 1279.7 1384.3
50 1263.7 1282.7 1333.5 1435.1
52 1314.5 1333.5 1384.3 1492.3
54 1358.9 1384.3 1435.1 1549.4
56 1409.7 1435.1 1485.9 1606.6
58 1460.5 1485.9 1536.7 1663.7
60 1511.3 1536.7 1587.5 1714.5
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 300 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 654.1 685.8 736.6 835.2
28 704.9 736.6 787.4 898.7
30 755.7 793.8 844.6 952.5
32 806.5 850.9 901.7 1006.6
34 857.3 901.7 952.5 1057.4
36 908.1 955.8 1006.6 1117.6
38 952.5 977.9 1016.0 1054.1
40 1003.3 1022.4 1070.1 1114.6
42 1054.1 1073.2 1120.9 1165.4
44 1104.9 1130.3 1181.1 1219.2
46 1152.7 1178.1 1228.9 1273.3
48 1209.8 1235.2 1286.0 1324.1
50 1244.6 1295.4 1346.2 1378.0
52 1320.8 1346.2 1397.0 1428.8
54 1352.6 1403.4 1454.2 1492.3
56 1403.4 1454.2 1505.0 1543.1
58 1447.8 1511.3 1562.1 1593.9
60 1524.0 1562.1 1612.9 1644.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 600 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26647.7 685.8736.6 866.9
28698.5736.6787.4914.4
30755.7793.8844.6971.6
32812.8850.9901.71022.4
34863.6901.7952.51073.2
36917.7955.81006.6 1130.3
38952.5990.6 1041.41104.9
401009.7 1047.81098.6 1155.7
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
541378.01428.8 1479.61555.8
561428.81479.61530.41612.9
581473.21536.71587.51663.7
60 1530.41593.9 1644.71733.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 900 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 660.4685.8 736.6882.7
28711.2736.6787.4946.2
30768.4793.8844.61009.7
32812.8850.9901.71073.2
34863.6901.7952.51136.7
36920.8 958.91009.7 1200.2
381009.71035.1 1085.91200.2
401060.51098.61149.41251.0
421111.31149.41200.21301.8
441155.71206.51257.31368.6
461219.21270.01320.81435.1
481270.0 1320.81371.6 1485.9
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 150 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 654.1673.1 698.5725.4
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
38958.9 974.91009.7 1044.7
401009.71022.4 1063.81095.5
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
581478.0 1500.11528.8 1579.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 300 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 654.1673.1 711.2771.7
28704.9723.9762.0825.5
30755.7774.7812.8886.0
32806.5825.5863.6939.8
34857.3876.3914.4993.9
36908.1 927.1965.2 1047.8
38971.6 1009.7 1047.81098.6
401022.41060.5 1098.61149.4
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
581484.41535.21573.3 1655.8
601557.3 1589.01630.41706.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 600 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26644.7 663.7714.5 765.3
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
38952.5990.61041.4 1104.9
401009.7 1047.81098.6 1155.7
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
60 1530.41593.9 1644.71733.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 900 LB
Spiral Wound Gasket Drawing

NPSInner Ring Sealing ElementOuter Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26666.8 692.2749.3838.2
28717.6743.0800.1901.7
30781.1806.5857.3958.9
32838.2863.6914.41016.0
34895.4920.8971.61073.2
36920.8946.2 997.01124.0
381009.7 1035.11085.9 1200.2
401060.51098.61149.41251.0
421111.31149.41200.21301.8
441155.71206.51257.31368.6
461219.21270.01320.81435.1
48 1270.01320.8 1371.61485.9
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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