离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(40)

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The earlier, in conceptual design, these features are given proper consideration, the more likely the ship designer will be able to provide an efficient and operable helideck.
7.4.2 Main References
CAP 437, Chapter 9.
7.4.3 Specific Features to Consider in Vessel Helideck Design
The following sections cover specific topics that are relevant to specialist vessels (but differ from fixed installations) and require specific consideration during the design of helidecks on specialist vessels.  The requirements set out below are in addition to those applied to fixed installation helidecks and should be read in conjunction with the sections of these guidelines that deal with structures, equipment, etc.
Potentially, specialist vessels can operate in many marine and meteorological environments.  However, several of the parameters and features to consider in design are broadly the same as MODUs (See Section 7.2).  These will include: 
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Operating environment

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Anchoring

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Dynamic positioning

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Drainage

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Helideck size, location and obstacle environment

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Materials of construction

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Helicopter fuelling

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Firefighting.
In addition the following topics should also be addressed:

 

7.4.3.1 Icing Conditions
In UK waters icing conditions on Installations and vessels will occur occasionally.
The potential for icing conditions to occur and the effects this may have on helicopter operations should be fully taken into account during design and vessel operations.
The primary concern should be to ensure that helideck fire / safety systems susceptible to malfunction during low temperature operations are fully protected.
A requirement of CAP 437 is to provide sufficient equipment to adequately deal with snow / ice / frost removal from the landing surface.
It also prudent, when designing a helideck, to consider its location in relation to any superstructures that may be affected by ice accretion during low temperature operations.
Ice falling onto helidecks from superstructures has been reported in the UK, in the past. This is a hazard to both aircraft and personnel safety and should be properly accounted for (See HSE Safety Notice 5/96 [Ref: 22]).  
7.4.3.2 Hinged Helidecks
Some vessels are designed with a portion(s) of the helideck hinged to provide a helideck of adequate size or to make way for the primary vessel operation and for coming into port.  Examples of these arrangements include seismic vessels equipped with foredeck and aft mounted helideck structures.
The primary concern for the helideck designer, from a helicopter operations viewpoint, is to ensure that hinge systems do not create a hazard for the helicopter whilst landing and manoeuvring.  It is preferable to locate hinges on the underside of the helideck however, where hinge systems protrude above helideck surface level they should be kept to minimum height and be designed such that they offer as small an obstruction as possible.  Apart from the obstruction hazard, the hinges should also be designed to avoid possible tyre damage.
　
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