摘要 |
A storage tank (10) has a hollow interior (25) defined by at least one wall, the at least one wall having at least two wall portions (12, 14, 16, 18, 20, 22, 24) and defining at least one passageway (60) communicating with the exterior of the tank that extends between at least two (12, 18) of the at least two wall portions (12, 14, 16, 18, 20, 22, 24) and through the hollow interior (25). |