| 摘要 |
A sealing arrangement for a subsea wellhead component is provided which comprises a primary seal (36) to prevent leakage of internal pressure from within the wellhead component and a secondary seal (38) surrounding the primary seal to prevent entry of ambient pressure into the wellhead component. The secondary seal is adapted to permit pressure which leaks past the primary seal to also leak past the secondary seal and vent to the atmosphere to provide an indication during testing of the primary seal that the primary seal has failed.
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