离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(27)

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The following sections of these design guidelines address in detail operational considerations, helideck systems and support equipment.  The designer may draw on this information for new installations in order to achieve a detailed design that follows good industry practice based on practical considerations that are supported by field experience.
For existing installations that are being modified, a review may be necessary to assess the effects of any new plant and equipment on the operability of the helideck. Examples of modifications that could affect operability include the construction of an additional accommodation or other module and provision of satellite dish nearby.
6.3.5.3 Helideck Environmental Considerations
Section 10 of these design guidelines deals with assessing the potential effects on helicopters from aerodynamic and thermal environments and wave motions that may be encountered around offshore helidecks.

(Photograph courtesy of John Burt Associates Limited)

(Photograph courtesy of Shell Exploration & Production) (Photograph courtesy of Conoco UK Ltd)

(Photograph courtesy of Amerada Hess Limited) (Photograph courtesy of Western Geco)

(Photograph courtesy of Western Geco)

(Photograph courtesy of Dolphin A/S)

(Photograph courtesy of Maersk)
6.4 THE SAFE LANDING AREA
6.4.1 Main References
CAP 437, Chapter 2.
6.4.2 General
The safe landing area (SLA) must be big enough to accommodate the largest helicopter that the landing area is intended to serve.  The SLA is the area of a helideck that is contained within the WHITE Perimeter Line.  This does not necessarily mean that the SLA will be the largest possible ‘D’ circle that can be accommodated within the overall structural dimensions of a helideck.  Examples of helidecks with various Safe Landing Area arrangements are shown in the following figures 6.10 to 6.12 (see also previous sections that address the need to optimise helideck layout). The SLA should be given full and proper consideration from an operational perspective whilst laying out the helideck arrangement during the conceptual design phase of an installation or vessel.  
‘D’ is the largest dimension of the helicopter when the rotors are turning and in a conventional helicopter with an exposed tail rotor; it is the distance from the front of the main rotor tip path to the rear of the tail rotor tip path.  The parameter ‘D’ (overall length) for the chosen helicopter is found in CAP 437 – ‘D’ Value and Helicopter Type Criteria along with the aircraft weight data.
Importantly, the SLA should be carefully positioned on the helideck to give an obstruction free environment (see Section 4.7 for details), which will provide adequate landing, overshoot and take-off paths, ample clearance from structures, etc. during helicopter manoeuvres and sufficient space for the helideck crew to operate and passengers to embark and disembark safely.
　
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