离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(27)

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N  NE  E  SE  S  SW  W  NW  Var  Tota l 
0  0+  0+  0+  0+  0+  0+  0+  0+  0.3  0.5 
1  0.2  0.1  0.1  0.1  0.1  0.1  0.2  0.2  0.5  1.5 
2  0.9  0.8  0.7  0.6  0.8  0.6  1.2  1.0  0.2  7.0 
3  2.1  1.3  1.3  1.5  2.1  2.3  2.5  2.4  0+  15.5 
4  2.8  1.5  1.5  2.0  3.4  3.2  3.0  3.6  21.1 
5  2.7  1.0  1.8  2.3  4.2  3.6  3.4  3.5  22.5 
6  0.6  1.6  2.1  3.4  3.3  2.7  2.5  18.0 
7  0.2  1.1  1.3  1.8  2.0  1.4  1.1  9.8 
8  0.1  0.5  0.5  0.6  0.6  0.4  0.4  3.3 
9  0+  0.1  0.1  0.1  0.1  0.1  0.1  0.7 
10  0+  0+  0+  0+  0+  0+  0.1 
11  0+ 
12 
Total  11.6  5.7  8.8  10.5  16.5  16.1  14.9  14.9  1.0  100 
Figure 10.18 – Example wind frequency table showing estimation of total downtime.

In the example the total of the highlighted cells is 14.3% indicating that, on average, helideck restrictions may apply 1 day in 7. The direct cost and associated inconvenience of these flight limitations can only be determined by the field operator.  If necessary similar assessments may be made on a seasonal basis.
10.10 PRESENTATION OF WIND FLOW ASSESSMENT RESULTS
10.10.1 General
The results of wind flow assessment are used at two quite distinct stages of the development of an offshore installation design.
In the first instance the results are used in design.  They may be used to justify changes to the layout to the installation superstructure and helideck location, and they may be used to estimate the future operability of the helideck.  This requires detailed tabulations and plots of the aerodynamic features around the helideck, and Section 10.10.2 below contains recommended formats for the presentation of these results, and guidance on the range of different wind conditions and other parameters that should be covered.
When the design process is complete, and any changes have been taken into account, there is a need to summarise and present the data to the helicopter operators and pilots through BHAB Helidecks.  This ultimately needs to be a concise assessment of the flow modelling results, interpreted in terms of the restrictions that will need to be placed on flight operations.  Section 10.10.3 contains recommended formats for the presentation of this summary information to operators and pilots.
　
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