Multistage Cross-Over Spool

Flanged or other connected equipment with more than one restricted-area sealing means to provide suitable capability to suspend and seal around multiple inner strings of casing or tubing at several stages. NOTE A multistage cross-over spool may have a top connector with a pressure rating above that of the lower connector.

Source: API RP 17A Addendum 1, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, December 2010. Global Standards

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