.
Security of the installation when unmanned
.
Reducing the possibility of wasted flights, if for some reason, the helideck is unsuitable for a landing
.
Monitoring the ‘build-up’ of guano accumulations where the NUI is used as a roost by seabirds. This has merit for maintenance planning and avoiding helicopter landing restrictions.
8.2.5.11 Bird Exclusion Devices
Bird exclusion devices are covered in more detail in Section 11.11.
All NUIs should be fitted with an automatic bird-scaring device that may be manually switched off during periods when the installation is manned.
8.2.5.12 Tie Down Points
Where insufficient tie down points are provided on the helideck, it will not be permissible to conduct operations where a planned helicopter shut down is required. This deficiency will obviously effect helideck operability and preclude flights during strong wind conditions.
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9.0 HELIDECK STRUCTURES
9.1 INTRODUCTION
This section indicates some of the structural considerations to be taken into account to achieve a satisfactory helideck structural design. The helideck is the foundation on which helicopter operations take place on an offshore installation, MODU or vessel. The helideck and its supporting structure are safety critical elements as a result of their role in emergency evacuation, as well as during normal operations.
The helicopter facilities should have sufficient clear approach and departure paths to enable any helicopter intended to use the landing area to land and take off safely in any wind or weather conditions that permit helicopter operations.
The landing area should be situated so that it is located on the installation with respect to prevailing wind conditions in such a position that structure-induced airflow and temperature effects are minimised.
Designers should be aware of all of the types of helicopter likely to use the helideck, both normally and in an emergency. The helicopter landing and take-off area and parking area should be of sufficient size and strength and laid out so as to accommodate the largest size of helicopter to be used and to adequately resist impact from heavy and emergency landings.
Helicopter parameters for all of the known helicopters that will operate to the helideck should be obtained from the helicopter manufacturers. It is recommended the designer compiles a database for the helicopters, noting dimensions, weights, contact areas etc. and reviews the data as necessary, including projections for likely future helicopter developments, to ensure the helideck design will remain suitable for use in the future.
The helideck and supporting structure should be designed to withstand the worst likely emergency to be encountered. CAP 437 assumes that a single engine failure in the hover at 9.14 metres wheel height (30 feet) is the case among likely survivable cases which would generate the highest vertical rate of decent onto the helideck.
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