Method of vessel fabrication

Claim 1

A METHOD OF FABRICATING A TWO-LAYER PRESSURE VESSEL: FORMING AN INNER SHELL, SAID INNER SHELL BEING A COMPLETE ENCLOSURE WITH AN OPENING THEREIN; FORMING AN OUTER SHELL ABOUT SAID INNER SHELL, THE INSIDE OF SAID OUTER SHELL BEING SLIGHTLY LARGER THAN THE OUTSIDE OF SAID INNER SHELL; DETERMINING A TENTATIVE INTERNAL PRESSURE LEVEL FOR APPLICATION TO THE INSIDE OF THE INNER SHELL TO EXPAND BOTH THE INNER AND THE OUTER SHELL; APPLYING A FLUID MEDIUM TO THE INSIDE OF THE INNER SHELL THROUGH THE OPENING THEREIN TO INCREASE GRADUALLY THE PRESSURE UP TO THE SELECTED TENTATIVE INNER PRESSURE, THEREBY EXPANDING BOTH THE INNER VESSEL AND THE OUTER VESSEL; REMOVING THE FLUID MEDIUM TO DECREASE THE PRESSURE WITHIN THE INNER VESSEL THEREBY CONTRACTING BOTH THE INNER VESSEL AND THE OUTER VESSEL; OBSERVING THE LONGITUDINAL STRAIN ON THE OUTSIDE OF THE OUTER SHELL IN RELATION TO THE DECREASING PRESSURE TO DETERMINE IF THEIR REMAINS CONSTANT THEREBY DETERMINING PRESENCE OF REVERSE SLIDING; REAPPLYING THE FLUID MEDIUM TO THE INSIDE OF THE INNER SHELL THROUGH THE OPENING THEREIN TO INCREASE GRADUALLY THE PRESSURE UP TO THE SELECTED TENTATIVE INNER PRESSURE; FURTHER INCREASING THE PRESSURE A SLIGHT AMOUNT OVER THE TENTATIVE INNER PRESSURE; REMOVING AGAIN THE FLUID MEDFIUM TO DEVREASE THE PRESSURE WITHIN THE INNER VESSEL THEREBY CONTRACTING BOTH THE INNER VESSEL AND THE OUTER VESSEL; AND OBSERVING AGAIN THE LONGITUDINAL STRAIN ON THE OUTSIDE OF THE OUTER SHELL IN RELATION TO THE DECREASING PRESSURE TO DETERMINE IF THEIR RATIO REMAINS CONSTANT THEREBY DETERMINING THE PRESENCE OF REVERSE SLIDING.

Claim 2

A METHOD OF FABRICATING A TWO-LAYER PRESSURE VESSEL: FORMING AN INNER SHELL, SAID INNER SHELL BEING A COMPLETE ENCLOSURE WITH AN OPENING THEREIN; FORMING AN OUTER SHELL ABOUT SAID INNER SHELL, THE INSIDE OF SAID OUTER SHELL BEING SLIGHTLY LARGER THAN THE OUTSIDE OF SAID INNER SHELL; DETERMINING A TENTATIVE INTERNAL PRESSURE LEVEL FOR APPLICATION TO THE INSIDE OF THE INNER SHELL TO EXPAND BOTH THE INNER AND THE OUTER SHELL; APPLYING A FLUID MEDIUM TO THE INSIDE OF THE INNER SHELL THROUGH THE OPENING THEREIN TO INCREASE GRADUALLY THE PRESSURE UP TO THE SELECTED TENTATIVE INNER PRESSURE, THEREBY EXPANDING BOTH THE INNER VESSEL AND THE OUTER VESSEL; REMOVING THE FLUID MEDIUM TO DECREASE THE PRESSURE WITHIN THE INNER VESSEL THEREBY CONTRACTING BOTH THE INNER VESSEL AND THE OUTER VESSEL; OBSERVING THE LONGITUDINAL STRAIN ON THE OUTSIDE OF THE OUTER SHELL IN RELATION TO THE DECREASING PRESSURE TO DETERMINE IF THEIR REMAINS CONSTANT THEREBY DETERMINING PRESENCE OF REVERSE SLIDING; REAPPLYING THE FLUID MEDIUM TO THE INSIDE OF THE INNER SHELL THROUGH THE OPENING THEREIN TO INCREASE GRADUALLY THE PRESSURE UP TO THE SELECTED TENTATIVE INNER PRESSURE; FURTHER INCREASING THE PRESSURE A SLIGHT AMOUNT OVER THE TENTATIVE INNER PRESSURE; REMOVING AGAIN THE FLUID MEDFIUM TO DEVREASE THE PRESSURE WITHIN THE INNER VESSEL THEREBY CONTRACTING BOTH THE INNER VESSEL AND THE OUTER VESSEL; AND OBSERVING AGAIN THE LONGITUDINAL STRAIN ON THE OUTSIDE OF THE OUTER SHELL IN RELATION TO THE DECREASING PRESSURE TO DETERMINE IF THEIR RATIO REMAINS CONSTANT THEREBY DETERMINING THE PRESENCE OF REVERSE SLIDING.