Insulated refrigeration tank structures

Claim 1

AN INSULATING TANK STRUCTURE FOR HOLDING A LIQUEFIED GAS AT LOW TEMPERATURES HAVING THE COMBINATION OF A TANK HAVING WALLS AND A ROOF, FOR CONTAINING SAID GAS, WITH A STRUCTURE ARRANGED THEREABOUT FOR INSULATING SAID TANK FROM THE ATMOSPHERE COMPRISING A FIRST NON-VAPOR SEALED THIN ALUMINUM METAL SIDE WALL SUPPORTED ON A FIRST FRAMEWORK WHICH SPACES SAID SIDE WALL AWAY FROM THE TANK WALL BY A PRESELECTED AMOUNT TO FORM A FIRST SIDE AIRSPACE, EXPANSION BOLTS ANCHORING SAID FIRST FRAMEWORK TO SAID TANK WALLS IN A FLOATING MANNER, A FIRST NONVAPOR SEALED ROOF FORMED OF A THIN ALUMINUM METAL WALL SUPPORTED ON A ROOF SCAFFOLD WHICH SPACES SAID FIRST ROOF WALL AWAY FROM THE TANK ROOF BY A PRESELECTED AMOUNT, TO FORM A FIRST ROOF AIRSPACE, EXPANSION BOLTS ANCHORING SAID FIRST ROOF WALL TO SAID TANK ROOF IN FLOATING MANNER, SAID FIRST SIDE AIRSPACE AND SAID FIRST ROOF AIRSPACE BEING CHANNELLED FOR COMMUNICATION WITH EACH OTHER, A SECOND THIN ALUMINUM METAL NON-VAPOR SEALED SIDE WALL AND A SECOND THIN ALUMINUM METAL NON-VAPOR SEALED ROOF WALL EACH SUPPORTED ON A SIDE FRAMEWORK AND ROOF SCAFFOLD WHICH SPACES THE SECOND SIDE AND ROOF WALLS AWAY FROM THE FIRST SIDE AND ROOF WALLS BY A PRESELECTED AMOUNT, TO FORM SECOND SIDE AND ROOF AIRSPACES IN COMMUNICATION WITH EACH OTHER, A THIRD THIN ALUMINUM METAL SIDE WALL SUPPORTED ON A THIRD FRAMEWORK WHICH SPACES THE THIRD SIDE WALL AWAY FROM THE SECOND SIDE WALL BY A PRESELECTED AMOUNT TO FORM A THIRD SIDE AIRSPACE, A THIRD THIN ALUMINUM METAL ROOF WALL SUPPORTED ON A THIRD ROOF SCAFFOLD WHICH SPACES SAID THIRD ROOF WALL AWAY FROM SAID SECOND ROOF WALL BY A PRESELECTED AMOUNT, TO FORM A THIRD ROOF AIRSPACE, SAID THIRD WALL AIRSPACES COMMUNICATING WITH EACH OTHER, VAPOR SEALING MEANS ON THE OUTER FACE OF THE THIRD METAL SIDE WALL AND ON THE THIRD METAL ROOF WALL, COMPRISING A PRESSURE SEALED TAPE OVER ALL JOINTS FORMING SAID WALLS AND A PRESSURE CAP EMBRACING SAID TAPE AND FORCING IT INTO CONTACT WITH THE WALL FACES, A PLURALITY OF CONDUITS EXTENDING THROUGH SAID SIDE WALLS COMMUNICATING WITH SAID FIRST SIDE AND ROOF AIRSPACE AND PROJECTING INTO THE ATMOSPHERE EXTERNAL OF SAID STRUCTURE AND CONTROL VALVES ON SAID CONDUITS NORMALLY SEALING SAID CONDUITS FROM THE ATMOSPHERE TO PERMIT VENTING OF SAID FIRST AIRSPACE BY OPENING SAID VALVES.