| 摘要 |
A secondary containment in which gasoline passes from a storage tank through an underground pipeline past an impact valve to an inlet of a gasoline dispenser includes inner and outer pipelines. The inner pipeline includes a rigid segment connected to the storage tank at one end and a flexible pipe segment at its other end. The flexible segment further connects to an additional pipe segment which passes through the bottom of a gasoline containment box to an impact valve housed therein. The impact valve, in turn, leads to the dispenser inlet. The box is installed below the dispenser, and the flexible segment connects to the additional pipe segment at a point below the box. The flexible segment is removed from the outer pipeline by disconnecting it from the rigid pipe segment, then disconnecting the impact valve from the dispenser inlet and box, and removing the impact valve from the box. The additional pipe segment and the flexible pipe segment are thus pulled through the bottom of the containment box.
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