| 摘要 |
A fail safe secondary containment system for a cryogenic liquid transport pipeline spool having a mainline liquid transport pipe and a secondary containment pipe whi ch overlies the mainline liquid transport pipe and is affixed to the outer surface of the mainline liquid transport pipe to form a sealed annular containment space therebetween, has a cap mounted on the secondary containment pipe to provide a sealed tertiary space. A first check valve has an inlet connected to the secondary containment space for receiving fluid therefrom and an outlet connected to t he tertiary containment space and a second check valve has an inlet corrected to the tertiary containment space for receiving fluid therefrom and an outlet connected to the inside of the mainline liquid transport pipe.
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