Flange Gaskets Spiral Wound Dimensions Class wise
Dimensions of Spiral Wound Gaskets ASME B16.20 used with Raised Face flanges ASME B16.5 (150# TO 2500#)
Class 150 NPS 1/2-24 |
||||
|
NPS |
Inner Ring |
Sealing Element |
Outer Ring |
|
|
d1 |
d2 |
d3 |
d4 |
|
|
1/2 |
14.2 |
19.1 |
31.8 |
47.8 |
|
3/4 |
20.6 |
25.4 |
39.6 |
57.2 |
|
1 |
26.9 |
31.8 |
47.8 |
66.8 |
|
1.1/4 |
38.1 |
47.8 |
60.5 |
76.2 |
|
1.1/2 |
44.5 |
54.1 |
69.9 |
85.9 |
|
2 |
55.6 |
69.9 |
85.9 |
104.9 |
|
2.1/2 |
66.5 |
82.6 |
98.6 |
124 |
|
3 |
81 |
101.6 |
120.7 |
136.7 |
|
4 |
106.4 |
127 |
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 |
|
NPS |
d1 |
d2 |
d3 |
d4 |
|
Inner Ring |
Sealing Element |
Outer Ring |
||
Class 300 NPS 1/2-24
|
||||
|
NPS |
Inner Ring |
Sealing Element |
Outer Ring |
|
|
d1 |
d2 |
d3 |
d4 |
|
|
1/2 |
14.2 |
19.1 |
31.8 |
54.1 |
|
3/4 |
20.6 |
25.4 |
39.6 |
66.8 |
|
1 |
26.9 |
31.8 |
47.8 |
73.2 |
|
1.1/4 |
38.1 |
47.8 |
60.5 |
82.6 |
|
1.1/2 |
44.5 |
54.1 |
69.9 |
95.3 |
|
2 |
55.6 |
69.9 |
85.9 |
111.3 |
|
2.1/2 |
66.5 |
82.6 |
98.6 |
130.3 |
|
3 |
81 |
101.6 |
120.7 |
149.4 |
|
4 |
106.4 |
127 |
149.4 |
181.1 |
|
5 |
131.8 |
155.7 |
177.8 |
215.9 |
|
6 |
157.2 |
182.6 |
209.6 |
251 |
|
8 |
215.9 |
233.4 |
263.7 |
308.1 |
|
10 |
268.2 |
287.3 |
317.5 |
362 |
|
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 |
|
NPS |
d1 |
d2 |
d3 |
d4 |
|
Inner Ring |
Sealing Element |
Outer Ring |
||
Class 600 NPS 1/2-24
|
||||
|
NPS |
Inner Ring |
Sealing Element |
Outer Ring |
|
|
d1 |
d2 |
d3 |
d4 |
|
|
1/2 |
14.2 |
19.1 |
31.8 |
54.1 |
|
3/4 |
20.6 |
25.4 |
39.6 |
66.8 |
|
1 |
26.9 |
31.8 |
47.8 |
73.2 |
|
1.1/4 |
38.1 |
47.8 |
60.5 |
82.6 |
|
1.1/2 |
44.5 |
54.1 |
69.9 |
95.3 |
|
2 |
55.6 |
69.9 |
85.9 |
111.3 |
|
2.1/2 |
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 |
406.4 |
492.3 |
|
16 |
389.9 |
412.8 |
463.6 |
565.2 |
|
18 |
438.2 |
469.9 |
527.1 |
612.9 |
|
20 |
489 |
520.7 |
577.9 |
682.8 |
|
24 |
590.6 |
628.7 |
685.8 |
790.7 |
|
NPS |
d1 |
d2 |
d3 |
d4 |
|
Inner Ring |
Sealing Element |
Outer Ring |
||
Class 900 NPS 1/2-24
|
||||
|
NPS |
Inner Ring |
Sealing Element |
Outer Ring |
|
|
d1 |
d2 |
d3 |
d4 |
|
|
1/2 |
14.2 |
19.1 |
31.8 |
63.5 |
|
3/4 |
20.6 |
25.4 |
39.6 |
69.9 |
|
1 |
26.9 |
31.8 |
47.8 |
79.5 |
|
1.1/4 |
33.3 |
39.6 |
60.5 |
88.9 |
|
1.1/2 |
41.4 |
47.8 |
69.9 |
98.6 |
|
2 |
52.3 |
58.7 |
85.9 |
143 |
|
2.1/2 |
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 |
|
NPS |
d1 |
d2 |
d3 |
d4 |
|
Inner Ring |
Sealing Element |
Outer Ring |
||
Class 1500 NPS 1/2-24
|
||||
|
NPS |
Inner Ring |
Sealing Element |
Outer Ring |
|
|
d1 |
d2 |
d3 |
d4 |
|
|
1/2 |
14.2 |
19.1 |
31.8 |
63.5 |
|
3/4 |
20.6 |
25.4 |
39.6 |
69.9 |
|
1 |
26.9 |
31.8 |
47.8 |
79.5 |
|
1.1/4 |
33.3 |
39.6 |
60.5 |
88.9 |
|
1.1/2 |
41.4 |
47.8 |
69.9 |
98.6 |
|
2 |
52.3 |
58.7 |
85.9 |
143 |
|
2.1/2 |
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 |
177.8 |
254 |
|
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 |
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 |
679.5 |
901.7 |
|
NPS |
d1 |
d2 |
d3 |
d4 |
|
Inner Ring |
Sealing Element
|
|||
|
|
||||
|
NPS |
Inner Ring |
Sealing Element |
Outer Ring |
|
|
d1 |
d2 |
d3 |
d4 |
|
|
1/2 |
14.2 |
19.1 |
31.8 |
69.9 |
|
3/4 |
20.6 |
25.4 |
39.6 |
76.2 |
|
1 |
26.9 |
31.8 |
47.8 |
85.9 |
|
1.1/4 |
33.3 |
39.6 |
60.5 |
104.9 |
|
1.1/2 |
41.4 |
47.8 |
69.9 |
117.6 |
|
2 |
52.3 |
58.7 |
85.9 |
146 |
|
2.1/2 |
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 |
|
5 |
124.5 |
143 |
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 |
311.2 |
476.3 |
|
12 |
292.1 |
317.5 |
368.3 |
549.4 |
|
NPS |
d1 |
d2 |
d3 |
d4 |
|
Inner Ring |
Sealing Element |
Outer Ring |
||
General notes:
- Dimensions are in millimeters unless otherwise indicated.
- Image shows a Spiral Wound gasket with Inner - and Outer ring.
- d1 = Inside diameter when Inner ring is used.
- d2 = Inside diameter sealing element when no Inner ring is used.
- d3 = Outside diameter of sealing element.
- d4 = Outside diameter of Outer ring.
- Thickness of inner and outer ring: 2.97 mm - 3.33 mm.
- Thickness sealing element: 4.45 mm.
- Tolerance Outside diameter for NPS 1/2 through NPS 8 is ± 0.8 mm; for NPS 10 trough NPS 24 tolerance is + 1.5 mm - 0.8 mm.
- ASME B16.20 does not covers class 400 flanges up to NPS 3 and class 900 flanges up to NPS 2.1/2.
- There are no class 400 flanges NPS 1/2 thru NPS 3 (use Class 600), class 900 flanges NPS 1/2 thru NPS 2.1/2 (use Class 1500), or class 2500 flanges NPS 14 or larger.
- 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.
- ASME B16.20 which covers spiral wound gaskets requires the use of solid metal inner rings in: Pressure Class 900, nominal pipe sizes 24 and larger, Pressure Class 1500 from nominal pipe sizes 12 and larger, Pressure Class 2500 from nominal pipe sizes 4 and larger and all PTFE filled gaskets.