초록

A double-wall tank having inner and outer walls bonded to connecting hollow annular ribs. A passageway through the ribs enable leak-detecting liquid to fill the spaces between ribs, within ribs, and between end caps.

대표청구항 ▼

A double-wall tank particularly adapted for use underground and comprising radially spaced inner and outer cylindrical walls bonded to hollow ribs disposed therebetween, each of the hollow ribs extending lengthwise annularly around the inside of the outer cylindrical wall and around the outside of t

A double-wall tank particularly adapted for use underground and comprising radially spaced inner and outer cylindrical walls bonded to hollow ribs disposed therebetween, each of the hollow ribs extending lengthwise annularly around the inside of the outer cylindrical wall and around the outside of the inner cylindrical wall and the hollow ribs being spaced from each other axially of the cylindrical walls, and spaces in the hollow ribs being in communication with spaces between the ribs and between the cylindrical walls.