Port/liner assembly method for pressure vessel

1. A method comprising;

molding polymeric material to form a polymeric liner defining a fluid containment cavity and having an opening defining a port aperture extending between an inner surface and an outer surface of the polymeric liner, a rigid ring element is embedded within the polymeric liner and surrounding the port aperture;

disposing a metallic port element on the outer surface of the polymeric liner and registered with the port aperture;

fixing the metallic port element to the rigid ring element; and

applying a fiber composite material about the outer surface of the polymeric liner to form a composite overwrapped pressure vessel.

2. The method of claim 1 , wherein the molding step comprises molding polymeric material about all sides of the rigid ring element and embedding the rigid ring element between the inner surface and an outer surface of the polymeric liner.

3. The method of claim 1 , wherein the fixing step comprises bolting the metallic port element to the rigid ring element.

4. The method of claim 3 , further comprising disposing a constant force element disposed on the bolts.

5. The method of claim 3 , further comprising unbolting the metallic port element from the rigid ring element.

6. The method of claim 1 , wherein the molding comprises roto-molding.

7. The method of claim 1 , further comprising disposing an o-ring between the metallic port element and outer surface of the polymeric liner.

8. The method of claim 1 , wherein the rigid ring element is concentric with the port aperture.

9. The method of claim 1 , wherein the molding step forms a seamless polymeric liner defining a fluid containment cavity.

10. The method of claim 1 , wherein the rigid ring element is completely embedded within the polymeric liner.

11. The method of claim 1 , wherein the rigid ring element surrounds the port aperture.

12. The method of claim 1 , wherein the molding step embeds the rigid ring element within the polymeric liner.

13. The method of claim 1 , wherein the rigid ring element is formed of a metal.

14. The method of claim 1 , wherein the molding step embeds the rigid ring element and an attached fastener within the polymeric liner.

15. The method of claim 14 , wherein the fastener has a fastener head and the rigid ring element is between the fastener head and the outer surface of the polymeric liner.

16. The method of claim 14 , wherein the fixing step comprises mating a bolt nut to the fastener to fix the metallic port element to the rigid ring element.

17. A method comprising;

molding polymeric material to form a seamless polymeric liner defining a fluid containment cavity and having an opening defining a port aperture extending between an inner surface and an outer surface of the polymeric liner;

embedding a rigid ring element within the seamless polymeric liner during the molding step, the rigid ring element surrounding the port aperture;

disposing a metallic port element on the outer surface of the seamless polymeric liner and registered with the port aperture;

fixing the metallic port element to the rigid ring element; and

applying a fiber composite material to the outer surface of the polymeric liner.

18. The method of claim 17 , wherein the molding step embeds the rigid ring element and an attached fastener within the seamless polymeric liner.

19. The method of claim 18 , wherein the fastener has a fastener head and the rigid ring element is between the fastener head and the outer surface of the seamless polymeric liner.

20. The method of claim 18 , wherein the fixing step comprises mating a bolt nut to the fastener to fix the metallic port element to the rigid ring element.