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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 Combinations Maximum 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

NPS Inner Ring Sealing Element Outer 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 81.0 101.6 120.7 136.7
4 106.4 127.0 149.4 174.8
5 131.8 155.7 177.8 196.9
6 157.2 182.6 209.6 222.3
8 215.9 233.4 263.7 279.4
10 268.2 287.3 317.5 339.9
12 317.5 339.9 374.7 409.7
14 349.3 371.6 406.4 450.9
16 400.1 422.4 463.6 514.4
18 449.3 474.7 527.1 549.4
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

NPS Inner Ring Sealing Element Outer 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
8 215.9 233.4 263.7 308.1
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

NPS Inner Ring Sealing Element Outer 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 78.7 101.6 120.7 149.4
4 102.6 120.7 149.4 193.8
5 128.3 147.6 177.8 241.3
6 154.9 174.8 209.6 266.7
8 205.7 225.6 263.7 320.8
10 255.3 274.6 317.5 400.1
12 307.3 327.2 374.7 457.2
14 342.9 362.0 406.4 492.3
16 389.9 412.8 463.6 565.2
18 438.2 469.9 527.1 612.9
20 489.0 520.7 577.9 682.8
24 590.6 628. 7 685.8 790.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 900 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½ 14.2 19.1 31.8 63.5
¾ 20.6 25.4 39.6 69.9
1 26.9 31.8 47.8 79.5
33.3 39.6 60.5 88.9
41.4 47.8 69.9 98.6
2 52.3 58.7 85.9 143.0
63.5 69.9 98.6 165.1
3 78.7 95.3 120.7 168.4
4 102.6 120.7 149.4 206.5
5 128.3 147.6 177.8 247.7
6 154.9 174.8 209.6 289.1
8 196.9 222.3 257.3 358.9
10 246.1 276.4 311.2 435.1
12 292.1 323.9 368.3 498.6
14 320.8 355.6 400.1 520.7
16 374.7 412.8 457.2 574.8
18 425.5 463.6 520.7 638.3
20 482.6 520.7 571.5 698.5
24 590.6 628.7 679.5 838.2
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 1500 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
½ 14.2 19.1 31.8 63.5
¾ 20.6 25.4 39.6 69.9
1 26.9 31.8 47.8 79.5
1 ¼ 33.3 39.6 60.5 88.9
1 ½ 41.4 47.8 69.9 98.6
2 52.3 58.7 85.9 143.0
2 ½ 63.5 69.9 98.6 165.1
3 78.7 92.2 120.7 174.8
4 97.8 117.6 149.4 209.6
5 124.5 143.0 177.8 254.0
6 147.3 171.5 209.6 282.7
8 196.9 215.9 257.3 352.6
10 246.1 266.7 311.2 435.1
12 292.1 323.9 368.3 520.7
14 320.8 362.00 400.1 577.9
16 374.7 406.4 457.2 641.4
18 425.5 463.6 520.7 704.9
20 476.3 514.4 571.5 755.7
24 577.9 616.0 679.5 901.7
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.5 CLASS 2500 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer 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

NPS Inner Ring Sealing Element Outer 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

NPS Inner Ring Sealing Element Outer 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

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 647.7 685.8 736.6 866.9
28 698.5 736.6 787.4 914.4
30 755.7 793.8 844.6 971.6
32 812.8 850.9 901.7 1022.4
34 863.6 901.7 952.5 1073.2
36 917.7 955.8 1006.6 1130.3
38 952.5 990.6 1041.4 1104.9
40 1009.7 1047.8 1098.6 1155.7
42 1066.8 1104.9 1155.7 1219.2
44 1111.3 1162.1 1212.9 1270.0
46 1162.1 1212.9 1263.7 1327.2
48 1219.2 1270.0 1320.8 1390.7
50 1270.0 1320.8 1371.6 1447.8
52 1320.8 1371.6 1422.4 1498.6
54 1378.0 1428.8 1479.6 1555.8
56 1428.8 1479.6 1530.4 1612.9
58 1473.2 1536.7 1587.5 1663.7
60 1530.4 1593.9 1644.7 1733.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series A CLASS 900 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 660.4 685.8 736.6 882.7
28 711.2 736.6 787.4 946.2
30 768.4 793.8 844.6 1009.7
32 812.8 850.9 901.7 1073.2
34 863.6 901.7 952.5 1136.7
36 920.8 958.9 1009.7 1200.2
38 1009.7 1035.1 1085.9 1200.2
40 1060.5 1098.6 1149.4 1251.0
42 1111.3 1149.4 1200.2 1301.8
44 1155.7 1206.5 1257.3 1368.6
46 1219.2 1270.0 1320.8 1435.1
48 1270.0 1320.8 1371.6 1485.9
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 150 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 654.1 673.1 698.5 725.4
28 704.9 723.9 749.3 776.2
30 755.7 774.7 800.1 827.0
32 806.5 825.5 850.9 881.1
34 857.3 876.3 908.1 935.0
36 908.1 927.1 958.9 987.6
38 958.9 974.9 1009.7 1044.7
40 1009.7 1022.4 1063.8 1095.5
42 1060.5 1079.5 1114.6 1146.3
44 1111.3 1124.0 1165.4 1197.1
46 1162.1 1181.1 1224.0 1255.8
48 1212.9 1231.9 1270.0 1306.6
50 1263.7 1282.7 1325.6 1357.4
52 1314.5 1333.5 1376.4 1408.2
54 1365.3 1384.3 1422.4 1463.8
56 1422.4 1444.8 1478.0 1514.6
58 1478.0 1500.1 1528.8 1579.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 300 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 654.1 673.1 711.2 771.7
28 704.9 723.9 762.0 825.5
30 755.7 774.7 812.8 886.0
32 806.5 825.5 863.6 939.8
34 857.3 876.3 914.4 993.9
36 908.1 927.1 965.2 1047.8
38 971.6 1009.7 1047.8 1098.6
40 1022.4 1060.5 1098.6 1149.4
42 1085.9 1111.3 1149.4 1200.2
44 1124.0 1162.1 1200.2 1251.0
46 1178.1 1216.2 1254.3 1317.8
48 1231.9 1263.7 1311.4 1368.6
50 1267.0 1317.8 1355.9 1419.4
52 1317.8 1368.6 1406.9 1470.2
54 1365.3 1403.4 1454.2 1530.4
56 1428.8 1479.6 1524.0 159+3.9
58 1484.4 1535.2 1573.3 1655.8
60 1557.3 1589.0 1630.4 1706.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 600 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 644.7 663.7 714.5 765.3
28 685.8 704.9 755.7 819.2
30 752.6 778.0 828.8 879.6
32 793.8 831.9 882.7 933.5
34 850.9 889.0 939.8 997.0
36 901.7 939.8 990.6 1047.8
38 952.5 990.6 1041.4 1104.9
40 1009.7 1047.8 1098.6 1155.7
42 1066.8 1104.9 1155.7 1219.2
44 1111.3 1162.1 1212.9 1270.0
46 1162.1 1212.9 1263.7 1327.2
48 1219.2 1270.0 1320.8 1390.7
50 1270.0 1320.8 1371.6 1447.8
52 1320.8 1371.6 1422.4 1498.6
54 1378.0 1428.8 1479.6 1555.8
56 1428.8 1479.6 1530.4 1612.9
58 1473.2 1536.7 1587.5 1663.7
60 1530.4 1593.9 1644.7 1733.6
Spiral wound Gasket Dimensions : ASME B16.20 : For Flanges to B16.47 Series B CLASS 900 LB

Spiral Wound Gasket Drawing

NPS Inner Ring Sealing Element Outer Ring
Inside Dia (d1) Inside Dia (d2) Outside Dia (d3) Outside Dia (d4)
26 666.8 692.2 749.3 838.2
28 717.6 743.0 800.1 901.7
30 781.1 806.5 857.3 958.9
32 838.2 863.6 914.4 1016.0
34 895.4 920.8 971.6 1073.2
36 920.8 946.2 997.0 1124.0
38 1009.7 1035.1 1085.9 1200.2
40 1060.5 1098.6 1149.4 1251.0
42 1111.3 1149.4 1200.2 1301.8
44 1155.7 1206.5 1257.3 1368.6
46 1219.2 1270.0 1320.8 1435.1
48 1270.0 1320.8 1371.6 1485.9
Spiral wound Gasket Dimensions : For Gaskets to BS EN 1514-2 To suit BS EN 1092-1 Flanges

Spiral Wound Gasket Drawing

NOM PIPE SIZE INNER RING INSIDE DIAMETER SEALING ELEMENT INSIDE DIAMETER SEALING ELEMENT OUTSIDE DIAMETER OUTER RING OUTSIDE DIAMETER
PN10-PN40 PN64-PN160 PN10 PN16 PN25 PN40 PN63 PN100 PN160
10 18 24 34 34 46 46 46 46 56 56 56
15 23 29 39 39 51 51 51 51 61 61
20 28 34 46 46 61 61 61 61 72 72
25 35 41 53 53 71 71 71 71 82 82 82
32 43 49 61 61 82 82 82 82 87 87
40 50 56 68 68 92 92 92 92 103 103 103
50 61 70 86 86 107 107 107 107 113 119 119
65 77 86 102 106 127 127 127 127 137 144 144
80 90 99 115 119 142 142 142 142 148 154 154
100 115 127 143 147 162 162 162 162 174 180 180
125 140 152 172 176 192 192 194 194 210 217 217
150 167 179 199 203 218 218 224 224 247 257 257
175 189 199 225 231 247 247 254 265 277 287 287
200 216 228 248 252 273 273 284 284 309 324 324
250 267 279 303 307 327 329 340 640 364 391 388
300 318 330 354 358 377 384 400 400 424 458 458
350 360 376 400 404 437 444 457 457 486 512
400 410 422 450 456 488 495 514 514 543 572
500 510 522 550 556 593 617 624 624 657 704
600 610 622 650 656 695 734 731 731 764 813
700 710 722 756 762 810 804 833 833 879 950
800 810 830 864 870 917 911 942 942 988
900 910 930 964 970 1017 1011 1042 1042 1108
1000 1010 1030 1074 1080 1124 1128 1154 1154 1220
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