Spiral Wound Gaskets
     
Spiral Wound Gaskets can be used to seal fluid pressure up to 250 bar cryoprnices temperature as low as -200°C and up to elevated temperature of 1000°C. Products are widely used in the oil, gas, petrochemical process and engineering industries.
     
     
Spiral wound gaskets type:
     
 
Type Thickness(mm)
Basic form 3.2 4.5
With inner ring   4.5
With outer ring   4.5
With inner and outer ring   4.5
     
Structure type:
     
 
Filler Hoop Inner ring Outer ring
Asbestos SUS 304 Carbon steel Carbon steel
Graphite SUS 316 SUS 304 SUS 304
PTFE SUS 316L SUS 316 SUS 316
    SUS 316L SUS 316L
     
The table below may be used for selected material of
inner ring and winding metal.
     
 
Trade name AISI Hardness(HB/HV) Temperature(°C)
Stainless steel 304 304 130~180 -250~+550
Stainless steel 316 316 130~180 -100~+550
Stainless steel 316L 316L 130~190 -100~+550
     
  The outer ring is generally manufactured from carbon steel with an
anti-corronsion treatment.
     
The table below may be used for determining the correct filler.
     
 
Filler material Temperature(°C) Max operating pressure(kg/cm2)
Graphite -200~550 250
Asbestos -150~450 100
PTFE -240~260 100
     
Flange type and Spiral Wound Gasket form
     
 
Flange type Spiral Wound Gasket form
Flat face flange(F.F) Gasket with an outer ring
Gasket with an inner and outer ring
Raised face flange(R.F) Gasket with an outer ring
Gasket with an inner and outer ring
Male and female flange(M & F) Basic form gasket
Gasket with an inner ring
Tongue and groove flange(T & F) Basic form gasket
Gasket with an inner ring
Flat and groove flange(F & G) Basic form gasket
Gasket with an inner ring
     
Tolerances of thickness
     
 
Item Thickness(mm) Tolerances(mm)
Gasket thickness 4.5, 3.2 +0.2
-0.1
Ring thickness 3.0 ±0.24
     
The table below specifies the production diameter tolerance (Nominal pipe diameter for flanges in accordance with):
     
 
  DIN (mm) ANSI B16.5
BS1560 (mm)
Mss sp-44
API 605 Tolerances
Inner ring I.D.
Gasket I.D.
<=600 <=24" >=26" and <=34" ±0.5
>600 and <=800 >24" and <=34" >=36" and <=60" ±0.9
>800 and <=1600 >34" and <=60"   ±1.3
>1600 >60"   ±1.6
Gasket O.D. <=600 <=24" <=24" ±0.9
>600 and <=1600 >24" and <=60"

>24" and <=60"

±1.8

1600 >60"  

±2.2

Outer ring O.D     >=1/2" and <=60" ±0.9
<=600 <=24"   0-1.0
>600 and <=1000 >24" and <=34"   0-1.8
>1000 and <=1600 >34" and <=60"   0-2.2
     
Engineering Data
     
Styles RW, RWI Dimensions 1/4" to 24" Flanges
ASME B16.20 Gaskets for ASME B16.5 Flanges
     
     
Class 150
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/4* 0.50 0.88 1.75
1/ 2 0.56 0.75 1.25 1.88
3/4 0.81 1.00 1.56 2.25
1 1.06 1.25 1.88 2.63
1-1/4 1.50 1.88 2.38 3.00
1-1/2 1.75 2.13 2.75 3.38
2 2.19 2.75 3.38 4.13
2-1/2 2.62 3.25 3.88 4.88
3 3.19 4.00 4.75 5.38
3-1/2* 4.50 5.25 6.38
4 4.19 5.00 5.88 6.88
4-1/2* 5.50 6.50 7.00
5 5.19 6.13 7.00 7.75
6 6.19 7.19 8.25 8.75
8 8.50 9.19 10.38 11.00
10 10.56 11.31 12.50 13.38
12 12.50 13.38 14.75 16.13
14 13.75 14.63 16.00 17.75
16 15.75 16.63 18.25 20.25
18 17.69 18.69 20.75 21.63
20 19.69 20.69 22.75 23.88
24 23.75 24.75 27.00 28.25
     
  * ASME B16.20 does not include dimensions for NPS 1/4, 3-1/2, or 4-1/2, or Class 400 flanges up to NPS 3 and Class 900 flanges up to NPS 2-1/2. Dimensions in inches.
     
Class 300
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/4* 0.50 0.88 1.75
1/ 2 0.56 0.75 1.25 2.13
3/4 0.81 1.00 1.56 2.63
1 1.06 1.25 1.88 2.88
1-1/4 1.50 1.88 2.38 3.25
1-1/2 1.75 2.13 2.75 3.75
2 2.19 2.75 3.38 4.38
2-1/2 2.62 3.25 3.88 5.13
3 3.19 4.00 4.75 5.88
3-1/2* 4.50 5.25 6.50
4 4.19 5.00 5.88 7.13
4-1/2* 5.50 6.50 7.75
5 5.19 6.13 7.00 8.50
6 6.19 7.19 8.25 9.88
8 8.50 9.19 10.38 12.13
10 10.56 11.31 12.50 14.25
12 12.50 13.38 14.75 16.63
14 13.75 14.63 16.00 19.13
16 15.75 16.63 18.25 21.25
18 17.69 18.69 20.75 23.50
20 19.69 20.69 22.75 25.75
24 23.75 24.75 27.00 30.50
     
Class 400
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/4* 0.50 0.88 1.75
1/2* 0.75 1.25 2.13
3/4* 1.00 1.56 2.63
1* 1.25 1.88 2.88
1-1/4* 1.88 2.38 3.25
1-1/2* 2.13 2.75 3.75
2* 2.75 3.38 4.38
2-1/2* 3.25 3.88 5.13
3* 4.00 4.75 5.88
3-1/2* 4.13 5.25 6.38
4 4.19 4.75 5.88 7.00
4-1/2* 5.31 6.50 7.63
5 5.19 5.81 7.00 8.38
6 6.19 6.88 8.25 9.75
8 8.25 8.88 10.38 12.00
10 10.25 10.81 12.50 14.13
12 12.50 12.88 14.75 16.50
14 13.75 14.25 16.00 19.00
16 15.75 16.25 18.25 21.13
18 17.69 18.50 20.75 23.38
20 19.69 20.50 22.75 25.50
24 23.75 24.75 27.00 30.25
     
Class 600
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/4* 0.50 0.88 1.75
1/2 0.56 0.75 1.25 2.13
3/4 0.81 1.00 1.56 2.63
1 1.06 1.25 1.88 2.88
1-1/4 1.50 1.88 2.38 3.25
1-1/2 1.75 2.13 2.75 3.75
2 2.19 2.75 3.38 4.38
2-1/2 2.62 3.25 3.88 5.13
3 3.19 4.00 4.75 5.88
3-1/2* 4.13 5.25 6.38
4 4.19 4.75 5.88 7.63
4-1/2* 5.31 6.50 8.25
5 5.19 5.81 7.00 9.50
6 6.19 6.88 8.25 10.50
8 8.25 8.88 10.38 12.63
10 10.25 10.81 12.50 15.75
12 12.50 12.88 14.75 18.00
14 13.75 14.25 16.00 19.38
16 15.75 16.25 18.25 22.25
18 17.69 18.50 20.75 24.13
20 19.69 20.50 22.75 26.88
24 23.75 24.75 27.00 31.13
     
  * ASME B16.20 does not include dimensions for NPS 1/4, 3-1/2, or 4-1/2, or Class 400 flanges up to NPS 3 and Class 900 flanges up to NPS 2-1/2. Dimensions in inches.
     
Class 900
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/2* 0.75 1.25 2.50
3/4* 1.00 1.56 2.75
1* 1.25 1.88 3.13
1-1/4* 1.56 2.38 3.50
1-1/2* 1.88 2.75 3.88
2* 2.31 3.38 5.63
2-1/2* 2.75 3.88 6.50
3 3.19 3.75 4.75 6.63
3-1/2* 4.13 5.25 7.50
4 4.19 4.75 5.88 8.13
4-1/2* 5.31 6.50 9.38
5 5.19 5.81 7.00 9.75
6 6.19 6.88 8.25 11.38
8 7.75 8.75 10.13 14.13
10 9.69 10.88 12.25 17.13
12 11.50 12.75 14.50 19.63
14 12.63 14.00 15.75 20.50
16 14.75 16.25 18.00 22.63
18 16.75 18.25 20.50 25.13
20 19.00 20.50 22.50 27.50
24 23.25 24.75 26.75 33.00
     
Class 1500
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/2* 0.56 0.75 1.25 2.50
3/4* 0.81 1.00 1.56 2.75
1* 1.06 1.25 1.88 3.13
1-1/4* 1.31 1.56 2.38 3.50
1-1/2* 1.63 1.88 2.75 3.88
2* 2.06 2.31 3.38 5.63
2-1/2* 2.50 2.75 3.88 6.50
3 3.19 3.63 4.75 6.88
3-1/2* 4.13 5.25 7.38
4 4.19 4.63 5.88 8.25
4-1/2* 5.31 6.50 9.13
5 5.19 5.63 7.00 10.00
6 6.19 6.75 8.25 11.13
8 7.75 8.50 10.13 13.88
10 9.69 10.50 12.25 17.13
12 11.50 12.75 14.50 20.50
14 12.63 14.25 15.75 22.75
16 14.50 16.00 18.00 25.25
18 16.75 18.25 20.50 27.75
20 18.75 20.25 22.50 29.75
24 22.75 24.25 26.75 35.50
     
  Class 2500
     
 
Size
NPS
Inner Ring Sealing Element Outer Ring
Inside (A)
Diameter
Inside (B)
Diameter
Outside ©
Diameter
Outside (D)
Diameter
1/2 0.56 0.75 1.25 2.75
3/4 0.81 1.00 1.56 3.00
1 1.06 1.25 1.88 3.38
1-1/4 1.31 1.56 2.38 4.13
1-1/2 1.63 1.88 2.75 4.63
2 2.06 2.31 3.38 5.75
2-1/2 2.50 2.75 3.88 6.63
3 3.19 3.63 4.75 7.75
4 4.19 4.63 5.88 9.25
5 5.19 5.63 7.00 11.00
6 6.19 6.75 8.25 12.50
8 7.75 8.50 10.13 15.25
10 9.69 10.63 12.25 18.75
12 11.50 12.50 14.50 21.63
     
  * ASME B16.20 does not include dimensions for NPS 1/4, 3-1/2, or 4-1/2, or Class 400 flanges up to NPS 3 and Class 900 flanges up to NPS 2-1/2. Dimensions in inches.
     
  Notes :
1. The inner ring thickness shall be 0.117-0.131 inches.
2. For sizes NPS 1-1/4 thru NPS 3, the inside diameter tolerance is ±0.03 inches, for larger sizes, the inside diameter tolerance is ±0.06 inches.
3. There are no Class 400 flanges NPS 1/2 thru NPS 3 (use Class 600), Class 900 flanges NPS 1/2 thru NPS 21/
2 (use Class 1500), or Class 2500 flanges NPS 14 or larger.
4. The inner ring inside diameters shown for NPS 1-1/4 thru 2-1/2 in Class 1500 and 2500 will produce inner ring widths of 0.12 inches, a practical minimum for production purposes.
5. Inner rings are required for Class 900, NPS 24 gaskets, Class 1500 NPS 12 thru NPS 24 gaskets, and Class 2500 NPS 4 thru NPS 12 gaskets.
     
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