Flange gasket

1. A method of making a corrugated metal gasket for use between flanges, the method comprising:

providing an annular ring made from a raw stock material comprising a first portion and a second portion;

machining a first plurality of substantially uniform corrugations into a first axial surface of said second portion of said annular ring; and

machining a second plurality of substantially uniform corrugations into a second axial surface of said second portion of said annular ring,

wherein said first portion of said annular ring has a non-compressed axial thickness after said machining of said first plurality of substantially uniform corrugations and said machining of said second plurality of substantially uniform corrugations,

wherein said first portion is distinct from said second portion and said first portion does not include corrugations,

wherein a non-compressed distance between a peak of a corrugation of said first plurality of corrugations and a trough of said corrugation of said first plurality of corrugations is less than said non-compressed axial thickness of said first portion,

wherein said first and/or second plurality of corrugations are the largest corrugations of the annular ring,

wherein the non-compressed axial thickness of the material of the first portion is less than a distance measurable between parallel lines defined by the troughs of the first and second plurality of substantially uniform corrugations,

wherein the machining a first plurality of substantially uniform corrugations includes cutting a corrugated profile by radial machining of said first axial surface, and wherein the corrugated profile is subsequently milled to form the desired corrugated geometry.

2. The method according to claim 1 wherein the providing the annular ring includes machining the selected raw stock material to produce an annular ring shape.

3. The method according to claim 2 wherein the machining the raw stock material includes use of a water jet or a laser.

4. The method according to claim 1 wherein the providing the annular ring includes forming an initially straight strip of the selected raw stock material into an annular ring shape by welding opposing ends of the initially straight strip.

5. The method according to claim 1 wherein the raw stock material is selected to have a thickness of 0.250 inches.

6. The method according to claim 1 wherein a pitch between adjacent corrugations in the first axial surface and the second axial surface is at least 0.125 inches.

7. The method according to claim 1 wherein a pitch between adjacent corrugations in the first axial surface and the second axial surface is about 0.250 inches.

8. The method according to claim 1 further comprising providing an outer guide ring to the corrugated metal gasket.

9. The method according to claim 8 wherein providing the outer guide ring includes machining an annular groove into an outer annular edge of the annular ring, said outer annular edge disposed between the first axial surface and the second axial surface, and attaching the outer guide ring into the annular groove.

10. The method according to claim 8 wherein the outer guide ring is unitary and formed from the annular ring.

11. A corrugated metal gasket made according to the method of claim 8 .

12. A corrugated metal gasket made according to the method of claim 1 .

13. The corrugated metal gasket of claim 12 wherein an outside diameter of the corrugated metal gasket is between 6.12 and 6.88 inches.

14. The corrugated metal gasket of claim 12 wherein an inside diameter of the corrugated metal gasket is 4.87 inches.

15. A method of making a corrugated metal gasket for use between flanges, the method comprising:

providing an annular ring made from a raw stock material comprising a first portion and a second portion;

machining a first plurality of substantially uniform corrugations into a first axial surface of said second portion of said annular ring; and

machining a second plurality of substantially uniform corrugations into a second axial surface of said second portion of said annular ring,

wherein said first portion of said annular ring has a non-compressed axial thickness after said machining of said first plurality of substantially uniform corrugations and said machining of said second plurality of substantially uniform corrugations,

wherein said first portion is distinct from said second portion and said first portion does not include corrugations,

wherein a non-compressed distance between a peak of a corrugation of said first plurality of corrugations and a trough of said corrugation of said first plurality of corrugations is less than said non-compressed axial thickness of said first portion,

wherein said first and/or second plurality of corrugations are the largest corrugations of the annular ring,

wherein the non-compressed axial thickness of the material of the first portion is less than a distance measurable between parallel lines defined by the troughs of the first and second plurality of substantially uniform corrugations,

wherein the machining a first plurality of substantially uniform corrugations includes cutting a corrugated profile by radial machining of said first axial surface,

wherein the corrugated profile is subsequently milled to form the desired corrugated geometry, and

wherein the first axial surface and the second axial surface are coated with graphite.

16. A corrugated metal gasket made according to the method of claim 15 .