Storage tank.

摘要

A tank for storing a large quantity of liquid, e.g. drinking water or sewage is formed from a flexible light-weight bag (5) located within a wire mesh surround (1). The bag has vertical rigid or semi-rigid ribs (6) fixed to its side walls. As liquid is emptied from the tank the sides of the bag collapse inwardly and are raised again when the bag is filled. The ribs prevent the back from crumpling and prevent folds of material being trapped when the bag is refilled.