Offshore Structure Platform Design - Offshore Structures: Design, Construction and Maintenance - page 201

FIGURE 3.60 Helideck as a separate platform.

has an upward and outward slope of at least 10 ° . Standard dimensions for safety

nets are given in Table 3.18 .
The net should be strong enough to withstand and contain, without damage,
a 100 kg weight being dropped from a height of 1 m.
According to API RP2L, a safety net designed to meet these criteria should
not act as a trampoline, giving a

effect. Where lateral or longitudinal
center bars are provided to strengthen the net structure, they should be arranged
and constructed to avoid causing serious injury to persons falling on them. The
ideal design has a

“ bounce ”

effect, which should securely contain a body fall-
ing, rolling or jumping into it, without serious injury. When considering the
securing of the net to the structure and the materials used, care should be
taken that each segment will meet adequacy of purpose considerations. Polypro-
pylene deteriorates over time; various wire meshes have been shown to be
suitable if properly installed.
For the helideck markings, the color of the helideck should be dark green or
gray, as shown in Figure 3.62 . In addition, the perimeter should be clearly
marked with a white painted line 300 mm wide.
Figure 3.62 also presents the dimensions of the yellow circle and the H
marking on the helideck.

“ hammock ”