曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
Chains should be installed at each point of access to the helideck, preferably at the initial entry point (e.g. bottom of stairway).
9.9 DRAINAGE
9.9.1 Introduction
Good drainage of helidecks is important. Water and aviation fuel puddling on the landing surface is to be avoided as it may have an adverse impact during operations, particularly in an emergency. A helideck with puddling problems can also directly affect the safety of aircraft and personnel and the operability of the helideck when icing conditions are present.
Helidecks should therefore be designed to remain free from standing water and fuel accumulations at all times.
On vessels, MODUs and floating structures drainage may be assisted by the vessel motions. This assumes that the scuppers are adequately designed to carry away any standing liquids.
Low level, bow mounted helidecks may also be seriously affected by ‘green water’ or spray. This operational feature should be taken into account.
9.9.2 Main References
CAP 437, Chapter 3.
9.9.3 Environmental Considerations
Discharging pollutants from offshore installations, MODUs and vessels is generally considered an environmentally unacceptable practice. It is therefore prudent to carefully consider helideck drainage and any restrictions that may be applied.
However, there is currently no prohibition of draining pollutants (e.g. aviation fuel) to the sea in an emergency, as would be the case in the event of a helicopter crash, particularly if the event were to involve a fire.
MARPOL Annex 1, Regulation 11(a) states that, Regulations 9 and 10 of this Annex shall not apply to: ‘(a) The discharge of oil or oily mixture necessary for the purpose of securing the safety of a ship or saving life at sea;………’.
9.9.4 Operational Considerations
The helideck drain system should be designed with the following operational requirements in mind:
.
Good containment (within the confines of the helideck) of burning aviation fuel
.
Rapid and safe disposal of any liquids flowing onto the landing surface
.
Potential for drains system blockages minimised
.
Easy checking and maintenance of the system.
9.9.5 Design Considerations
The surface selected for the helideck will determine the likely effects on surface drainage. They are as follows:
.
Steel plated - susceptible to puddling due to welded plate construction
.
Aluminium Extruded - tend to remain relatively free of water providing the surface profile allows good run off to the scuppers
.
Safedeck - very little surface water retention due to perforated surface design.
ICAO Heliport Manual [Ref. 54] recommends that a maximum camber of 1:100 be provided on a fixed platform helideck to facilitate drainage. In the case of MODUs, vessels and floating structures, see also Section 7 for further considerations when operating helicopters to moving helidecks.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(59)
