Approx Mid Point of Hull
with Minimum Pitch
Drilling Whole range
Drilling Whole range
a general understanding of Modules 
Varg is a very specific style and design of FPSO, many others are different since they are based on standered tanker hulls. The Fast style is
also specific. Of floating projects 75% are FPSO's, 10% FPSS's, 10% TLP's and 5% SPM's. ( see Varg GA Diag and Fast Forward Composite
Diag. If we also consider projects which have fixed jackets we bring into play another sizeable group which further increases the impact of a
design of a standard module. Process has its own particular forms of impact. The size of a particular process item, that is why Varg was
chosen as it has a large seperator, it also brings into play the question of preferred location. Varg had a design outline which settled the
approach of Seperation, but there are also other processes and other consideration.
C2V Where you see this, Click too View
Modules, General, Offshore
C2V Where you see this, Click too View
This location is a very common place for Seperation, any equipment with free
surface area liquids
If we look at the plan of Varg we can see that
Seperation is in its sweet spot, mid ships where the
effect of head on waves is minimised. If we look at
Fastforward Project Optimisation we can see similar
approaches. Where the landing of the hoses is mid
ships, Panama style we may see a slightly different
approach conditioned by the hase arrangement (go
Petronas Berantai FPSO style).
If location and space is a problem for a particular Process then we must also considor the process itself. Do Offshore Facilities have
Processes? Proces, a series of actions that produce change, then yes they do. Chemical Processes, well most of what happens Offshore
does not produce a chemical change. True Chemical Change happens on shore. Offshore a series of actions are carried out to find crude or
gas, condition it to enable well production, further condition it to enable it to be stored or conveyed to shore. True change occurs onshore
where the crude is split into various fractions, products extracted, eg sulpher, carbon. Offshore we carry out limited processes such as
removing Well Water from Production and reinjecting it, dosing flowlings with chemicals such as MEG, In field seperation of MEG from Well
Water, De Aeration, Sea Water Treatment etc. To gather an understanding of the scope of these Offshore Systems NORSOK Standard P-100
gives an outline listing and there requiremets. The table of Systems from the 90,s when the scope of Offshore started to get formal definition
shows a rathe mechanistic list with hardly a mention of Chemical namesThe Systems although lacking complexity, the equipment used in
them can have restraints on where they are located. High Speed Rotating Machinery does not like vibration or being thrown all over the place,
bearings are monitored for vibration, gravitational displacemet, gap between rotating parts and casing etc. Both Varg and the shortened project
study were very much conditioned where the swivel should be located, hence the Modules are in areas where they dont interfere.
This Location favours Accomodation away from the process areas.
Accomodation may be in an existing location, often the stern or Bow, the later
demanding a rethink of these generalities
This Location is favoured for the Swivel and Mooring, about which the FPSO
may lay. Because of Bow movement it si not favoured for Rotating Equipment,
large liquid vessels
This Location is often chosen for less hazardous equipment. The stern usually
has less movement than the bow.
Fastforward Bow Postn
Fastforward Bow Postn
Fastforward Fwd of  Bow Postn
Fastforward Fwd of Bow Postn
 Fastforward  No Swivel
Fastforward No Swivel
NORSOK Offshore System List
NORSOK Offshore System List
In 4c Process, we reviewed generalisations
and chose Seperation as an example. Its a
good example because its very common and
comes with its own problems. In 4c_1, Varg
we use that topsides to elaborate these
problems to finalise modules, standard
modules. Varg being an FPSO shows newer
approaches to the design basis.
Level 1
Level 3