离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(43)

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Achieving the optimal position for locating a structure adjacent to another and maintaining the required operational clearances for the helideck(s) may not always be possible due to overriding marine, safety and other installation operating constraints (e.g. anchoring dictates the position of MODUs working over a template).
In such cases orientation of the structures should endeavour to minimise the potential obstructions to flight paths and to maximise the anticipated and most favourable prevailing winds over their helidecks.
8.1.3.2 Bridge Linking
When designing bridge links for a fixed or mobile installation to gain access to another installation the designer should take fully into account the positioning of gangway connection options and their likely effect on helideck operations in relation to impeding all or part of the host installation / mobile unit helideck 210° obstruction free sectors.
In some cases it may be necessary to forego the use of one of the helidecks and to nominate the other as the primary landing site.  In this case the ‘closed’ helideck should display a ‘Landing Prohibited’ Marker.
In the case of two permanently bridged fixed structures, both with helidecks, it may be decided that the newer structure with a helideck is the ‘operating’ helideck and the other becomes redundant or may be used as a secondary or emergency landing site if it remains accessible.

8.1.3.3 Environmental Effects around Helidecks
The environmental effects around helidecks are a key consideration when designing and operating offshore installations in combination.  See Section 10.
Whether the combined facilities are permanent new build structures, an additional installation to complement existing field facilities or a temporarily located mobile unit, great care should be taken to assess the probable impact on helideck aerodynamic performance and helicopter operations of one installation in relation to another.
During initial design or subsequent modification of installations where additional structures are planned it is imperative that the potential helideck aerodynamic effects are modelled as a complete complex to ensure that any interactions between the installations are fully understood and quantified.
8.1.4 Safety Cases
8.1.4.1 Permanent Arrangements

The Safety Case developed during the initial design (or if later modified) should reflect all aspects of the combined facilities that will have potential impacts on helicopter operations and flight safety.
Where it is intended that an additional permanent structure will be installed (within 1000 metres of the other), the effects on the helicopter flying environment around the combined facilities should be fully re-assessed (whether or not both structures have helidecks).  
The information in the Safety Case should also be passed to the Helicopter Operator / BHAB Helidecks in order for them to make an assessment of the extent and form of any operating restrictions or limitations that should be applied.  Flight Crews will use the information for flight planning and flight management purposes.
　
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