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1. main (upper) deck, which supports the drilling/production systems and

several modules (drilling, process, utilities, living quarters, compression,

etc.).

2. cellar deck, which supports systems that need to be placed at a lower

elevation and installed with the deck structures, such as pumps, some

utilities, pig launchers/ receivers, Christmas trees, wellhead manifolds,

piping, etc.

3. additional deck levels, if needed. For example, if simultaneous drilling

and production operations are planned, some process equipment may be

located in a mezzanine deck.

The typical modular deck components are:

- module support frame (MSF), which provides a space frame for

supporting the modules and transferring their load to the jacket/tower

structure. MSF may also be designed to envelope a number of platform

facilities, such as the storage tanks, pig launching and receiving systems,

metering /proving devices and the associated piping systems,

- Modules. These provide a number of production and life support

systems, such as the:

Living quarters module (generally supporting a heliport, communication

systems, hotel, messing, office and recreational facilities),

Utilities module (generally supporting power generation and electrical

and production control systems, including a control room),

Wellhead module (generally supporting the wellheads, well test and

control equipment),

Drill rig module (containing the drill tower, draw-works, drillers and

control rooms, drill pipe and casing storage racks and pipe handling systems).

Drill rig module is located over and supported by the wellhead module.

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