离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(26)

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Figure 6.4 – Fixed platform (NUI) with cantilevered helideck Figure 6.5 – Accommodation vessel with helideck above buoyancy legs and
anchor winches (also note the provision of 2 helidecks) Figure 6.6 – FPSO with aft mounted helideck Figure 6.7 – Drilling / Production ship with bow mounted Helideck (above bridge)  Figure 6.8 – Seismic vessel with foredeck mounted helideck Figure 6.9 – Seismic vessel with aft mounted helideck Figure 6.10 – Mobile Offshore Drilling Unit (MODU) with helideck Inboard of the
buoyancy legs and anchor winches
Figure 6.11 – Jack-up drilling rig with cantilevered helideck.

6.3.4 Helideck Orientation
6.3.4.1 Fixed Installations
The jacket, topsides, and riser strength and fatigue considerations for the chosen location of the facility will primarily dictate the orientation of fixed installations. Potential hydrodynamic and wind loadings on the structure have to be taken into account during design for the predicted oceanographic and environmental conditions likely to be encountered offshore.  
Reference should be made to Section 10 where this topic is discussed in detail with respect to helideck environmental effects.
6.3.4.2 FPSOs and Vessels
Ship-shaped FPSOs and Vessels generally have the ability to move their heading into the weather and, as a result, they have greater operational flexibility when optimising helideck orientation and movement for the prevailing winds.  This feature is addressed in more detail in Section 7.
6.3.4.3 MODUs, Jack-Ups and other Semi-Submersibles
MODUs and Jack-ups, when operating alone, are effectively the same as fixed installations when determining the helideck orientation.  
For example, in the Northern North Sea, the preferred orientation for a MODU is about 300° True because this is where the most severe weather comes from (e.g. winds and waves).
When MODUs, Jack-ups and other Semi-Submersibles (e.g. Floatels) are positioned for combined operations there is a need to integrate several key marine
(e.g. anchoring) and operating (bridging, etc.) requirements.  The marine, drilling and other operational positioning considerations will take priority.
This tends to cause some loss of flexibility for orienting the helideck to optimise wind flows.  However, in this mode of operation there will usually be a choice of operational helideck.  This situation is addressed in more detail in Section 7.
6.3.5 Assessing Suitability of the Proposed Helideck Arrangement
6.3.5.1 Introduction
Having decided upon the initial layout and before proceeding further with detailed design, the designer should examine operational effectiveness of the proposed arrangements with respect to both physical (space and other material aspects) and with respect to potential environmental effects.
6.3.5.2 New Designs and Modifications to Existing Installations 
　
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