Method and apparatus for lining process tanks

A method of lining a tank, the method comprising:

• extrusion welding a pair of sheets together by infusing a molten thermoplastic material along and between the pair of sheets;
• extrusion welding the pair of sheets to a bottom sheet by infusing the molten thermoplastic material along and between the pair of sheets and the bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet when the tank is filled with the contents;
• and
• positioning a triangular insert at a lining corner formed by the infused pair of sheets and bottom sheet and extrusion welding the triangular insert to the infused pair of sheets and bottom sheet.

A lining method for use with a tank, comprising:

• bonding a bottom sheet of a plurality of plasticized polyvinyl chloride sheets to a bottom of the tank;
• bonding a pair of sheets of the plurality of plasticized polyvinyl chloride sheets to adjacent walls of the tank and above the bottom sheet, each sheet of the pair of sheets having a first edge and a second edge such that the first edges of the pair of sheets are positioned at an intersection of adjacent walls of the tank to position an interface between the pair of sheets;
• exposing the interface between the pair of sheets to the atmosphere;
• moving a portable extrusion welder near the exposed interface;
• activating the portable extrusion welder to generate and discharge molten thermoplastic material;
• controlling the pressure and temperature of the discharged molten thermoplastic material;
• extrusion welding the pair of sheets together by infusing the molten thermoplastic material from the portable extrusion welder, along the pair of sheets and within the exposed interface of the pair of sheets at the controlled pressure and temperature;
• extrusion welding the pair of sheets to the bottom sheet by infusing the molten thermoplastic material along and between the pair of sheets and the bottom sheet at the controlled pressure and temperature wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet;
• and
• positioning a triangular insert at a lining corner formed by the infused pair of sheets and bottom sheet and extrusion welding the insert to the infused pair of sheets and bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet.

A lining method for use with a tank, comprising:

• bonding a bottom sheet of a plurality of sheets to a bottom of the tank;
• bonding a pair of sheets of the plurality of sheets to a wall of the tank and above the bottom sheet to position an interface between the pair of sheets and the bottom sheet, each sheet of the pair of sheets having a first edge and a second edge such that the first edges of the pair of sheets position another interface between the pair of sheets;
• exposing the interface between the pair of sheets and the bottom sheet and the other interface between the pair of sheets to the atmosphere;
• moving a portable extrusion welder near the exposed interfaces;
• activating the portable extrusion welder to generate and discharge molten polyvinyl chloride material;
• controlling the pressure and temperature of the discharged molten polyvinyl chloride material;
• extrusion welding the pair of sheets together by infusing the molten polyvinyl chloride material from the portable extrusion welder, along the pair of sheets and within the exposed interface of the pair of sheets;
• extrusion welding the pair of sheets to the bottom sheet by infusing the molten polyvinyl chloride material along and between the pair of sheets and the bottom sheet and within the exposed interface between the pair of sheets and the bottom sheet at the controlled pressure and temperature wherein the infused polyvinyl chloride material seals the pair of sheets and bottom sheets to isolate the tank from contents that contact the pair of sheets and bottom sheet;
• positioning a triangular insert at a lining corner formed by the infused pair of sheets and bottom sheet and extrusion welding the insert to the infused pair of sheets and bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet.

A method of lining a tank, the method comprising:

• extrusion welding a pair of plasticized polyvinyl chloride sheets together by infusing a molten thermoplastic material along and between the pair of plasticized polyvinyl chloride sheets;
• extrusion welding the pair of plasticized polyvinyl chloride sheets to a bottom plasticized polyvinyl chloride sheet by infusing the molten thermoplastic material along and between the pair of plasticized polyvinyl chloride sheets and the bottom plasticized polyvinyl chloride sheet wherein the infused thermoplastic material seals the pair of plasticized polyvinyl chloride sheets and bottom plasticized polyvinyl chloride sheet to isolate the tank from contents that contact the pair of plasticized polyvinyl chloride sheets and bottom plasticized polyvinyl chloride sheet when the tank is filled with the contents;
• and
• positioning a triangular insert at a lining corner formed by the infused pair of plasticized polyvinyl chloride sheets and plasticized polyvinyl chloride bottom sheet and extrusion welding the insert to the infused pair of sheets and bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet.

A method of lining a tank, the method comprising:

• extrusion welding a pair of sheets together by infusing a molten thermoplastic material along and between the pair of sheets;
• and
• extrusion welding the pair of sheets to a bottom sheet by infusing the molten thermoplastic material along and between the pair of sheets and the bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet when the tank is filled with the contents, wherein extrusion welding comprises:
• exposing the pair of sheets and the bottom sheet to the atmosphere;
• activating a portable extrusion welder to generate and discharge molten polyvinyl chloride material;
• controlling the pressure and temperature of the discharged molten polyvinyl chloride material;
• extrusion welding the pair of sheets together by infusing the molten polyvinyl chloride material from the portable extrusion welder, along the pair of sheets and along the pair of sheets and the bottom sheet;
• and
• positioning a triangular insert at a lining corner formed by the infused pair of sheets and bottom sheet and extrusion welding the insert to the infused pair of sheets and bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet.

A method of lining a tank, the method comprising:

• bonding a bottom sheet of a plurality of plasticized polyvinyl chloride sheets to the bottom of the tank;
• bonding a pair of sheets of the plurality of plasticized polyvinyl chloride sheets to a wall of the tank and above the bottom sheet to position an interface between the pair of sheets;
• activating a portable extrusion welder to generate and discharge molten thermoplastic material;
• controlling the pressure and temperature of the discharged molten thermoplastic material;
• extrusion welding the pair of sheets together by infusing the molten thermoplastic material from the portable extrusion welder, along the pair of sheets and within the interface of the pair of sheets at the controlled pressure and temperature;
• extrusion welding the pair of sheets to the bottom sheet by infusing the molten thermoplastic material along and between the pair of sheets and the bottom sheet at the controlled pressure and temperature wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet;
• and
• positioning a triangular insert at a lining corner formed by the infused pair of sheets and bottom sheet and extrusion welding the insert to the infused pair of sheets and bottom sheet wherein the infused thermoplastic material seals the pair of sheets and bottom sheet to isolate the tank from contents that contact the pair of sheets and bottom sheet.