Module Sequence, ISO Box Accomodation
Module M10, Magnus Power Generation
Lift Loads, Direct, Angular Force Triangulation
If 4a looked at Topsides Shapes and 4a_1 looked at a One Piece Module Topsides,
4a_2 introduces how Standard Modules as Boxes used whilst 4a_3 shows the current
fashion, (probably) now towards FPSO's and how those Boxes are used.
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a general understanding of Modules 
Modules, General, Offshore
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In 4a General we looked at
the shapes a module may
have to conform with.In
4a_2, Magnus is taken as
the example of a series of
Modules to make up a
4a_2 Magnus, Modules (Boxes) required a base to sit on a jacket Module Support
Frame and tops of Modules for a single pick using four point lift. On the Magnus Box
can be seen the Roof "X" shaped stiffening required for such a lift.
4a_2, also shows a Module Box based on an ISO Container, such boxes use a
standard Top Lift Frame and are in size the other end of the scale to Magnus
4a_1 Clair, was a Twin Crane Pick by one barge. The Topsides required a base
structure strong enough to sit on 4 legs, and a top structure for 2 lift points.
Magnus 4a _2 is used as an example to illlustrate the
progression that has gone on between its design time and
later developments as Clair 4a _1 and West Navion 4a _3.
Magnus was a platform of large module boxes sitting astride
a central corridor used for main corridor cabling, hooked
into the Modules Offshore when installed. One level of
Boxes sat ontop of another. This style of design was
conditioned by the Offshore Cranes available with a lift
capability to install them. Being on a large multileg jacket
the option to floatover was also limited. By the time Clair
came along to be installed the lift weight capability of
Offshore Cranes had improved, as 4a _1 illustates The
picture of the Magnus Module Modle shows the "X" beam
shape that must be added to the roof to lift each module.
This model style has developed to that used by West
Navion where multi point lifts with minimal side forces allows
less steel to be used in the Module. Any side forces are
restrained by Spreader Crane Beams which although not in
the Module still add to the crane load lift weight. Lifting
Modules is not only about the weight of the module but
must inclde the rigging.
4a_3 West Navion, had Power Module Boxes for Wartsila Deisels. The box is
somewhat smaller than Magnus and the Floor and Roof steel less as no module sits
ontop. This style of approach is now common in FPSO's as shown in recent concepts
If Magnus 4a _2 is one end of the scale this example using
the ISO Box approach is the other. Each Module (container)
is approximately 100 th the weight of some Magnus
Modules. In this example ISO boxes are stacked together to
form an accomodation block. The Block itself may be the
complete Topsides or it may become a Module to be
incorporated with other Modules into a Topside
Spreader Frame Connects to top of Container
Level 2
Level 1
Level 3
1, Magnus Elevation
1, Magnus Elevation
2, Magnus made of Modular Boxes
2, Magnus made of Modular Boxes
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