Tank assembly, related method of manufacture and reinforcement method

A tank assembly, comprising:

• an elongated tubular pipe structure formed by a steel reinforced polyethylene pipe;
• at least one end wall attached to the tubular pipe structure, the end wall comprising a composite unit formed by:
• a unitary plastic sheet member sized to cover a cross-sectional area defined by the tubular pipe structure;
• a plurality of composite reinforcement strips bonded to the plastic sheet member, each composite reinforcement strip including an elongated plastic base portion having a plurality of spaced apart ribs extending from a first side thereof and lengthwise therealong, each rib comprising an elongated metal reinforcement encased in plastic, the plastic base portion having a second side electrofusion welded to a surface of the plastic sheet member;
• wherein the plastic sheet member is electrofusion welded to the tubular pipe structure with an orientation such that each composite reinforcement strip extends vertically upward along the plastic sheet member with each rib running vertically along the end of the tubular pipe structure and each rib positioned at an exterior side of the tubular pipe structure.