Approx Mid Point of Hull

with Minimum Pitch

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.

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.

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.