离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(60)

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Whilst controlling a major helicopter fire and fuel spillage, monitor operations will lay down massive amounts of water / foam compound.  Therefore, the large area of a helideck combined with the need to rapidly clear large fluid volumes from the surface requires a highly effective drains system.  
To ensure that the safety of an installation, MODU or vessel is not compromised, the scuppers and drain headers should be designed:
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For the worst-case event (all monitors operating plus maximum fuel spillage) to ensure that good drainage flow rates can be achieved

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With a good upstand around the perimeter of the helideck to prevent accumulations of burning fuel mixed with the water / foam overflowing onto areas beneath the helideck surface

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With adequately sized scuppers to collect and retain the liquids and then direct them into the drain headers

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With debris traps to ensure that blocking cannot occur. These are essential and should be removable to facilitate cleaning and maintenance

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With effective flame traps incorporated to safely carry away ignited aviation fuel including the additional volume of liquid resulting from the use of firefighting media

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To discharge directly to the sea in a manner that provides adequate protection to the installation, MODU or vessel from ignited fuel residues on the sea surface.

 

Note: It is usually impractical to consider routing helideck surface drainage into the installation, MODU or vessel hazardous drainage system because it cannot accommodate the potentially high volume of fluid flow.
9.10  PERIMETER SAFETY NET
9.10.1 Introduction
The helideck perimeter safety net should provide a proper catchment for a person falling anywhere on the exposed perimeter of the deck.
9.10.2 Main References
CAP 437, Chapter 3.
Other references can be found in the ICAO Heliport Manual, IMO MODU Rules, etc.
In some jurisdictions there may be a requirement for the perimeter safety net not to exceed 150 mm above the elevation of the helideck surface.  This requirement is included in the IMO MODU Rules for harsh environment, for example.
9.10.3  Design Considerations
The overall dimensions, strength and configuration of the helideck perimeter net should be adequate.
The construction materials should be fire resistant or protected.
The dimensions of a perimeter safety net: both the width and height above landing surface, are critical.  This is because it is necessary for the helicopter to be able to clear the helideck perimeter net in the event of engine failure during take-off.  See Figure 9.10.
The angle of the perimeter safety net relative to the landing surface is also important. Where the angle is less than 10° an individual falling onto the net is unlikely to be adequately restrained from falling overboard.  Therefore, the net should be angled at approximately 10° from the horizontal.
　
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