| 摘要 |
An over-pressure limiting arrangement for a cryogen vessel comprising an access neck 20 for providing access in to a cryogen vessel at its lower extremity; a tubular structure 21 extending through the access neck; a turret outer assembly 24 enclosing upper extremities of the access neck 20 and the tubular structure 21; an egress path 40 defining a route for cryogen gas to escape from the turret outer assembly; and a pressure limiting device such as a quench valve 32 sealing the egress path from the interior of the turret outer assembly, operable to open in response to a differential pressure between the interior of the turret outer assembly and the interior of the egress path exceeding a predetermined value. The present invention particularly provides an auxiliary burst disc 50, or an equivalent valve, attached to the tubular structure 21, within the turret outer assembly 24. An inner surface 50a of the auxiliary burst disc 50, or valve, is exposed to the interior of the tubular structure, and an outer surface 50b of the auxiliary burst disc is exposed to the interior of the turret outer assembly 24. |
