Patent ID: 7918956

Claim:
A method for manufacturing a polymeric inner liner for a storage tank, in particular for a hydrogen storage tank, the method comprising the steps of: providing a cylindrical body made from polymer material, the cylindrical body including a structural layer and a barrier layer, and said cylindrical body having a first open end and a first peripheral connection tab at said first open end; providing a dome-shaped end cap made from polymer material, the end cap including a base with a cross-section that substantially corresponds to a cross-section of the first open end of the cylindrical body, and a second peripheral connection tab at a peripheral end portion of said end cap; placing the base of the end cap onto the first open end of the cylindrical body such that said first and second peripheral connection tabs contact each other; and welding the first and second peripheral connection tabs together, wherein the first and second peripheral connection tabs are bent inwards so that external surfaces of the cylindrical body and of the end cap are welded together.