CLOSURES FOR PRESSURE VESSELS, AND ASSOCIATED SYSTEMS AND METHODS

1 . A sealing member for sealing an interface between a first vessel portion of a pressure vessel and a second vessel portion of the pressure vessel, the sealing member comprising:

a first portion configured to be positioned between and contact the first vessel portion and the second vessel portion to provide a first seal; and

a second portion configured to contact an inner surface of the first vessel portion and an inner surface of the second vessel portion to provide a second seal.

2 . The sealing member of claim 1 wherein the second portion is sized to contact the inner surfaces of the first and second vessel portions via an interference fit.

3 . The sealing member of claim 1 wherein the second portion includes (a) a first angled surface configured to contact the inner surface of the first vessel portion and (b) a second angled surface configured to contact the inner surface of the second vessel portion.

4 . The sealing member of claim 1 wherein the first and second vessel portions bound a groove therebetween, and wherein the first portion includes (a) a first angled surface configured to contact a first surface of the groove and (b) a second angled surface configured to contact a second surface of the groove.

5 . The sealing member of claim 1 wherein:

the first and second vessel portions bound a groove therebetween;

the first portion includes (a) a first angled surface configured to contact a first surface of the groove and (b) a second angled surface configured to contact a second surface of the groove; and

the second portion includes (a) a first angled surface configured to contact the inner surface of the first vessel portion and (b) a second angled surface configured to contact the inner surface of the second vessel portion.

6 . The sealing member of claim 1 wherein the first portion has a generally rectangular cross-sectional shape.

7 . The sealing member of claim 1 wherein the first portion has a thickness less than a thickness of the second portion.

8 . The sealing member of claim 1 , further comprising a third portion extending between the first and second portions, wherein the third portion has a thickness less than a thickness of the first portion and less than a thickness of the second portion.

9 . A sealing system including:

a sealing member for sealing an interface between a first vessel portion of a pressure vessel and a second vessel portion of the pressure vessel, the sealing member comprising:

a first portion configured to be positioned between and contact the first vessel portion and the second vessel portion to provide a first seal; and

a second portion configured to contact an inner surface of the first vessel portion and an inner surface of the second vessel portion to provide a second seal.

10 . The sealing system of claim 9 wherein the second portion is sized to contact the inner surfaces of the first and second vessel portions via an interference fit.

11 . The sealing system of claim 9 wherein the second portion includes (a) a first angled surface configured to contact the inner surface of the first vessel portion and (b) a second angled surface configured to contact the inner surface of the second vessel portion.

12 . The sealing system of claim 9 wherein the first and second vessel portions bound a groove therebetween, and wherein the first portion includes (a) a first angled surface configured to contact a first surface of the groove and (b) a second angled surface configured to contact a second surface of the groove.

13 . The sealing system of claim 9 wherein:

the first and second vessel portions bound a groove therebetween;

the first portion includes (a) a first angled surface configured to contact a first surface of the groove and (b) a second angled surface configured to contact a second surface of the groove; and

the second portion includes (a) a first angled surface configured to contact the inner surface of the first vessel portion and (b) a second angled surface configured to contact the inner surface of the second vessel portion.

14 . The sealing system of claim 9 wherein the first portion has a generally rectangular cross-sectional shape.

15 . The sealing system of claim 9 wherein the first portion has a thickness less than a thickness of the second portion.

16 . The sealing system of claim 9 , further comprising a third portion extending between the first and second portions, wherein the third portion has a thickness less than a thickness of the first portion and less than a thickness of the second portion.

17 . A sealing system including:

a pressure vessel including:

a first vessel portion, and

a second vessel portion; and

a sealing member for sealing an interface between the first vessel portion the second vessel portion, the sealing member including:

a first portion configured to be positioned between and contact the first vessel portion and the second vessel portion to provide a first seal via a compression fit, and

a second portion configured to contact an inner surface of the first vessel portion and an inner surface of the second vessel portion to provide a second seal.

18 . The sealing system of claim 17 wherein the second portion is sized to contact the inner surfaces of the first and second vessel portions via an interference fit.

19 . The sealing system of claim 17 wherein the second portion includes (a) a first angled surface configured to contact the inner surface of the first vessel portion and (b) a second angled surface configured to contact the inner surface of the second vessel.

20 . The sealing system of claim 17 wherein the first and second vessel portions bound a groove therebetween, and wherein the first portion includes (a) a first angled surface configured to contact a first surface of the groove and (b) a second angled surface configured to contact a second surface of the groove.