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However, the design and construction of its production and utility systems will be subject to the offshore verification process only if designated as an Offshore Installation and deemed safety critical.
The helideck structure will usually be regarded as part of the ships structure. Where this is the case, it is important to consult the appointed Classification Society Ships’ or MODU Rules for Design & Construction and any International Rules (e.g. IMO and SOLAS) that have been included in the owners specification for the FPSO.
When designing an FPSO that will be operated in UK waters, helideck certification will require compliance with CAP 437 and not the IMO or other national codes.
Because there are currently some differences between UK and international maritime and offshore requirements, anomalies in the overall certification / verification processes may arise. These anomalies will need to be resolved with the appointed Classification Society and Verification Body, early in design.
7.3.6 Optimising Helideck Location and Layout
See Section 10, which deals specifically with helideck environmental effects.
7.3.7 Shuttle Tanker Operations
Helicopter landings on FPSOs during offloading operations may incur operating restrictions for both marine and safety reasons.
Landings on bow mounted helidecks may be routinely permitted. However, where the helideck is located at the stern of the vessel, helicopter operations will probably be limited during shuttle tanker activities due to the shuttle tanker orientation and obstructions caused by loading hoses, etc. temporarily infringing declared obstacle free sectors.
As a result of these operational limitations, shuttle tanker operations will have a direct effect on helideck availability and this should be taken into account when undertaking helideck operability analyses.
(Photo courtesy of Bluewater BV)
7.4 SPECIALIST VESSELS
7.4.1 Introduction
A whole range of specialist vessels of varying type, design, size, displacement and function work in the offshore oil and gas industry. Many are equipped with helidecks. These vessels include:
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Seismic vessels
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Diving Support vessels
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Well Intervention vessels
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Pipelaying vessels / barges
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Floatels / Accommodation vessels.
Each of these vessel types will have unique capabilities depending on their primary function. Additionally, there may be overriding constraints placed on the helideck design and its operation.
(Photograph courtesy of Technip Coflexip)
Depending on vessel size, basic hull and superstructure design, it is normally the primary function of the vessel (in addition to maintaining good vessel stability at all times) that will dictate the vessel layout and thus the helideck location, size, shape and elevation. Space and weight considerations will also dictate the locations (and sometimes capacities) of the associated helideck support systems.
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