| 摘要 |
A production swivel (10) with passive control of dynamic seal gap (66) width using internal swivel pressure. The swivel (10) includes inner and outer housings (16, 12) with a middle housing (17) which transfers component deformation due to fluid pressure from the dynamic sealing interface (64) to the static sealing interface (65). The outer housing and inner housing (16, 12) rotate together, but the outer housing (12) is free to expand radially outward from the middle housing (17) with increasing fluid pressure. A floating riser spool (60A) is pressure balanced at the connection to the inner housing (16) and to a fixed swivel stack base (54). Swivels (10a, 10B) are stacked with a swivel connector/spool (52) and upper and lower mounting rings (46, 48) cooperatively dimensioned so that access to seals (63, 64) can be obtained while the swivels (10a, 10b) remained stacked without the use of overhead cranes or other lifting points than the swivel being serviced. |
