离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(34)

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Although the helideck may be classified as a non-hazardous area under normal platform operating conditions, the specification and selection of electrical equipment used for helideck lighting systems, etc. should be suitable for use in potentially explosive atmospheres. This should ensure that the helideck could remain fully operational for evacuating personnel, providing prevailing conditions around the installation and at the helideck do not prohibit helicopter operations. 
Additionally, the specification and selection of equipment used in aviation fuel pumping and dispensing systems should be suitable for use in potentially explosive atmospheres and is dependent upon the system design and where each part of the system is to be located on the helideck or elsewhere on the installation.
When developing the design and preparing specifications for procuring helideck systems and equipment, reference should be made to the following:
.  
Dangerous Substances and Explosive Atmospheres Regulations 2002 [Ref: 12]

.  
Dangerous Substances and Explosive Atmospheres - Approved Code of Practice and Guidance (L138). [Ref: 19]

.  
HSE Operations Notice No. 58 (Jan 2003) - Dangerous Substances and Explosive Atmospheres Regulations 2002 - A short guide for the offshore industry. [Ref: 28]

.  
HSE Operations Notice No. 59 (Jan 2003) - The Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations 1996 - A short guide for the offshore industry. [Ref: 29]

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HSE Operations Notice No. 63 (Dec 2003) - A Guide to the Equipment and Protective Systems intended for Use in Potentially Explosive Atmospheres Regulations 1996. [Ref: 30]

11.2  VISUAL AIDS - MARKINGS
11.2.1 Introduction
Care is necessary to ensure that all markings on the helideck follow the guidance of CAP 437 precisely, except where otherwise agreed with the BHAB Helidecks.  
Where markings are found to be incorrect, this problem may have occurred during preparation of the initial helideck design drawings, whilst painting a new build helideck or as a result of repainting during helideck maintenance.
11.2.2 Main References
CAP 437, Chapter 4.
11.2.3 Helideck Markings
All helideck markings should be properly specified in accordance with CAP 437.
In particular, the offshore installation or vessel identification NAME should be adequately sized, unobstructed and clearly visible to flight crews approaching the helideck. The safe landing area should be identified as ONLY the area that is contained within the white perimeter line and within the 210° unobstructed arc, and does not include other adjacent helideck areas such as a parking area (the parking area should be painted in a contrasting colour).
If there is any doubt about particular helideck marking requirements, or where it considered both appropriate and necessary to deviate from the markings specified in CAP 437, designers should first consult with BHAB Helidecks or other specialists.
　
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