1, Swivel in Cone Buoy, Pull in
1, Swivel in Cone Buoy, Pull in
2, CALM, limited Swivel
2, CALM, limited Swivel
3, SALM, Limited Swivel
3, SALM, Limited Swivel
A Swivel is a device that allows an incoming fixed orientation Product/Process line to connect to a Floater that rotates around the same axis. The first two Diagrams illustrate the impact of Swivels on the remaining deck area in which to place modules or pancakes. The first 2 Diags show the typical positions for a Swivel Stack. The other two Diags are some styles of stack. Diag a) is the through deck variation  Do we need swivels the answer is not necessarily, Diag b) shows one where the connections between incoming lines and to the process deck are through flexibles. It is also the case that where a vessel is large enough to not have to weathervane then it can be fixed moored without a swivel. Fixed platforms  have an advantage in not needing a swivel. 
These Diagrams illustrate applications using a ship shape Floater, Diag 1 is a through deck cone.  Diag 2 is a SALM where in a simple form it uses a knuckle joint but again som versions use a table top requiring Swivels  Diag 3 a SALM usually used in Offloading, Diag 4 a typical swivel for a Basic FPSO
Through Deck Swivel Applications
* Diagram 1 and 2, show where such a swivel can be positioned. Position A) allows the ship to face bow or stern into the weather, this is a least rotation case. B) is the point nearer the Bow it allows a space of use between bow and swivel for such things as accomodation, control Room, helipad etc. C) is in the bow probably more favoured for hull conversions where accomodation and control; is alrady in place in the stern. D) and E) are other alternates in front of the bow allowing a better style of connection to the ship conventional applications using a ship shape Floater,
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General
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Index, Section  2 Supports,
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a general understanding of Modules 
MODULEitus
*
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Level 2
Level 2
Level 1
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Diagram 1 Stern Offloading
Diagram 1 Stern Offloading
 Diagram 2, Ships Varying Submergence Stern Offloading
Diagram 2, Ships Varying Submergence Stern Offloading
4, Conventional Inbuilt, Thru Deck
4, Conventional Inbuilt, Thru Deck
a), Swivel with Full Rotation
a), Swivel with Full Rotation
b), Swivel, Partial Rotation
b), Swivel, Partial Rotation
Various Swivel
Applications
Diag 1, Swivel,  5 Positions, Plan
Diag 1, Swivel, 5 Positions, Plan
Diag 2, Swivel,  5 Positions, Plan
Diag 2, Swivel, 5 Positions, Plan
Offloading Applications
Besides a Swivel for Production an arragement may be needed for Offloading. Diagrams 1 and 2 show an applications to Stern offloadid  to a shuttle tanker connected inseries with the FPSO. The impact from such arrangements means that the FPSO weather vanes around the Swivel Column, the shuttle tanker acts like a dogs tail and may wag as loading progresses. Both vessels may vary in displacement as Off Loading progesses
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1, Swivel at Bow
1, Swivel at Bow
2, Swivel Thru Deck Positions
2, Swivel Thru Deck Positions
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