4c_2_Clair

This section 4_c_2, Clair, uses Clair and other Topsides to show other forms of Modularisation which downscales the units of manufacture and

are often referred to as PAU,s, Pre assembled Units or Packages. Clair is a structure into which PAU,s are added prior to becoming a one

piece topside. It is an open frame structure. Although demobilised a good example of the smaller Platform is Statpipe 2/4s. This had an MSF

as a celler deck with conventional modules (2) mounted on it. If we view Elf Froy we see a Platform that clearly had the opportunity to add a

conventional Module. If we look at the extension of Processes on Heidrun we end up with a host of PAU,s none of which are very modular

other than being items in a Process System Train. Obviously one of the factors that affects all of these are the Process they must fulfill both in

termes of process functionality (does it remove salt from sea water) but also space (how big is it, will it fit in) and will the process function in

any locality, can we afford it, so the list of requirements goes on.

In 4c-2 we look at other approaches,

Clair and also Statpipe 2/4s, Froy and

Heidrun. Statpipe 2/4s illustrates the

small riser platform, simplistic with not a

lot on it. Froy illustrates the attraction of

room for expansion and M52 a one piece

module. Finally Heidrun illustrates where

space is at a premium, room for

expansion has not really been considored

and Modules are really not a solution.

Clair is an example of modules which are package size and added mainly during construction to the

structure in a sequence floor upon floor, This sequence of pictures shows :- 1) the complete structure

followed by 2) the outline of the Process System for Pigging the Export Line, 3) the initial element of

construction is a pigging module. 4)) shows the Pigging Module being incorporated into the Cellar Deck,

5) the mid deck which when completed is added to the Cellar Deck and finally 6 the Drilling Deck which

caps the Mid Deck. 7) shows the decks mounted one on top of the other. By design other major

packages such as Drilling Derrick and Accomodation may be added later or even Offshore. 8) covers later

additions for well connection.

Heidrun Style Concept, this shows what

happens in cases where systems need to be

added and unlike Froy, space is not available

for a full Module to be added. The example in

questiob concerns a Condeep but shows the

problem for any existing Topsides with no

space for expansion/ The system reqired

concerms Water Injection and and removal of

Sulphates and solids burden, To fit things

slace must be recognised and a Process

which minimises size needs to be selected.

Froy Style Concept, this shows what happens in cases where systems need to be added and previous

designs allow for a full Module to be added/ The MSF has a capability to take the weight and size of the

Module. The Module must be compact enough to fit the space. Many FPSO's now in building are

specific for their first Project with minimum space for the future. This may be OK where this is a one

Project, no future Process changes or modification with a size impact, for Field/FPSO/ Of flexibility is

required then major work may be necessary,

Statpipe Module Style Concept, this shows a different approach to

Clair in that the Jacket has an MSF and Modules are added on top in

layers. This platform is obsolessant but its concept is not. For the

simple platform for pipeline riser interstage pigging, riser hook up for

outreach wells, etc then this basic design may be applicable. What

has gone on since its demise is the design of outreach wells,

directional drilling and subsea development obviating bringing things

to the surface see 3c-3 Other Processes.