Vessels with personnel access provisions

1. A transportable vessel capable of holding and transporting high-purity and ultra-high-purity gases, comprising:

a shell defining an internal volume; said shell having an inner surface and an outer surface;

a hollow sleeve mounted on and extending through an opening in the shell;

a cover permanently connected to an end of the sleeve, and a support welded to an outer surface of the sleeve and the outer surface of the shell;

wherein the support locates the weld between the support and the outer surface away from said opening to prevent or discourage debris generated by the welding process from entering the internal volume when the weld is cut to remove the support, the sleeve and the cover to gain access to the opening.

2. The vessel of claim 1 , wherein the cover is welded to the end of the sleeve.

3. The vessel of claim 1 , wherein the end of the sleeve is located within the internal volume of the shell.

4. The vessel of claim 1 , further comprising a valve mounted on the cover.

5. The vessel of claim 1 , wherein the sleeve defines a passage extending between the internal volume and outside of the vessel, and the passage has a width or a diameter of approximately 2.5 feet or more.

6. The vessel of claim 1 , wherein the cover isolates the internal volume from an ambient environment outside of the vessel.

7. The vessel of claim 2 , further comprising a projection mounted on the cover; wherein the sleeve and the projection define a groove, and a weld that connects the cover and the sleeve is located at least in part within the groove.

8. The vessel of claim 2 , wherein the sleeve is substantially cylindrical and the support is substantially ring shaped.

9. A method for accessing an internal volume of a transportable vessel, the vessel comprising a shell that defines an internal volume, said shell having an inner surface and an outer surface, a sleeve mounted on the shell and extending through an opening in the shell, and defining a passage from outside of the vessel to the internal volume, a cover connected to an end of the sleeve by a weld, and a support welded to an outer surface of the sleeve and an outer surface of the shell, the method comprising:

cutting the weld between the outer surface of the shell and the support, wherein the support locates the weld between the support and the outer surface away from said opening to prevent or discourage debris generated by the welding process from entering the internal volume;

moving the cover, the sleeve and the support away from the passage; and

entering the internal volume by way of the passage.

10. The method of claim 9 , wherein moving the cover away from the passage comprises lifting the cover, the sleeve and the support.

11. The method of claim 9 , wherein the cover is welded to the end of the sleeve.

12. The method of claim 9 , wherein the end of the sleeve is located within an internal volume of the shell.

13. The method of claim 9 , wherein a valve is mounted on the cover.

14. The method of claim 9 , the sleeve defines a passage extending between the internal volume and outside of the vessel, and the passage has a width or a diameter of approximately 2.5 feet or more.

15. The method of claim 9 , wherein the cover isolates the internal volume from an ambient environment outside of the vessel.

16. The method of claim 9 , further comprising a projection mounted on the cover; wherein the sleeve and the projection define a groove, and a weld that connects the cover and the sleeve is located at least in part within the groove.

17. The method of claim 9 , wherein the sleeve is substantially cylindrical and the support is substantially ring shaped.

18. The vessel of claim 1 wherein the cover further comprises brackets for lifting straps.

19. The vessel for claim 9 , wherein said cover comprises brackets for lifting straps and prior to said moving step is the step of attaching lifting straps to said brackets.