High-pressure storage vessel constructed of pre-stressed concrete

Claim 1

A PRESSURE VESSEL COMPRISING: A MONOLITHIC PRE-STRESSED CONCRETE BODY INCLUDING A HOLLOW CYLINDRICAL AND END SLABS CLOSING THE TWO ENDS THEREOF; A FIRST PLURALITY OF SEPARATE PASSAGES EXTENDING FROM ONE AXIAL END OF SAID CONCRETE BODY TO THE OTHER AND THROUGH THE CONCRETE OF SAID HOLLOW CYLINDER AND OF SAID END SLABS, SAID FIRST PLURALITY OF PASSAGES INCLUDING A FIRST GROUP IN WHICH EACH PASSAGE CONFORMS TO A UNIDIRECTIONAL PART OF AN APPROXIMATE HELIX OF RIGHT HAND ABOUT THE AXIS OF, AND EACH PASSAGE EXTENDING ABOUT A PART ONLY OF THE CIRCUMFERENCE OF, SAID CONCRETE BODY, AND A FURTHER GROUP IN WHICH EACH PASSAGE CONFORMS TO A UNIDIRECTIONAL PART OF AN APPROXIMATE HELIX OF LEFT HAND ABOUT THE AXIS OF, AND EACH EXTENDING ABOUT A PART ONLY OF, THE CIRCUMFERENCE OF SAID CONCRETE BODY AND EACH CROSSING A PLURALITY OF THE PASSAGES IN THE SAID FIRST GROUP; A NETWORK OF CABLES ONE CONTAINED IN EACH ONE OF SAID FIRST PLURALITY OF SEPARATE PASSAGES; ANCHORS ONE ON EACH END OF EACH CABLE OF SAID NETWORK IN ENGAGEMENT WITH THE CONCRETE AT THE AXIALLY OUTER END SURFACES OF SAID END SLABS AND MAINTAINING THE CABLES UNDER TENSION AND THE CONCRETE OF SAID BODY IN COMPRESSION; A SECOND PLURALITY OF SEPARATE PASSAGES IN THE CONCRETE OF ONE OF SAID END SLABS AND A THIRD PLURALITY OF SEPARATE PASSAGES IN THE CONCRETE OF THE OTHER OF SAID END SLABS, EACH OF SAID SECOND AND THIRD PLURALITIES OF SEPARATE PASSAGES INCLUDING FIRST GROUPS AND SECOND GROUPS EXTENDING THROUGH THE CONCRETE OF THE RESPECTIVE END SLAB WITH THE PASSAGES OF THE FIRST GROUP EXTENDING TRANSVERESELY OF THE END SLAB AND CROSSING A PLURALITY OF PASSAGES OF THE SECOND GROUP; FURTHER NETWORKS OF CABLES ONE CONTAINED IN EACH ONE OF THE PASSAGES OF SAID SECOND PLURALITY AND SAID THIRD PLURALITY OF SEPARATE PASSAGES; ANCHORS ONE ON EACH END OF EACH CABLE OF SAID FURTHER NETWORKS IN ENGAGEMENT WITH THE CIRCUMFERENTIAL SURFACES OF THE CONCRETE OF THE END SLABS AND MAINTAINING THE CABLES OF SAID FURTHER NETWORKS UNDER TENSION AND THE CONCRETE OF THE END SLABS IN COMPRESSION.