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Many MODUs and specialist vessels are foreign flagged and are certificated to operate on a worldwide basis. When they enter UK waters on contract they should meet the UK standards required for helidecks and helicopter operations otherwise they are likely to be severely restricted, until such time as they do. They will require inspection by the BHAB Helidecks before helicopter operations can commence on the UKCS.
Often there is a failure to comply fully with UK standards. This has the effect of reducing commercial value in the worldwide marketplace because many other countries are also applying the same or very similar standards.
The following sections deal with the variations to helideck layout and systems that will be encountered when specifying the design requirements for floating structures, MODUs and vessels. These requirements (over and above those generally applied to a fixed installation) should be fully taken into account when the floating structure, MODU or specialist vessel is intended to operate in UK waters.
7.2 MOBILE DRILLING RIGS
7.2.1 Introduction
Invariably a MODU (a semi-submersible, jack-up on the move, or drill ship) will initially be specified using the IMO MODU Code [Ref: 70] as the basis for design.
It should be noted that helidecks are covered in Chapter 13 of that code, and the basic deck specified is smaller than that required by ICAO Annex 14 Volume 2 and CAP 437 standards. However, ‘where adverse climatic conditions are prevalent, as in the North Sea, the Coastal State may…[specify a larger helideck]’ (MODU Code 13.2.3). The MODU Code specifications are still very brief and relying exclusively on Chapter 13 of the IMO MODU Code, could easily mislead a designer into producing an inadequate helideck facility for UK operations.
Therefore, it is imperative that UK national codes and guidance for helidecks and helicopter operations are referenced alongside the IMO MODU Code.
7.2.2 Main References
CAP 437, Chapter 6.
IMO MODU Code.
7.2.3 Specific Features to Consider in MODU Helideck Design
The following sections cover specific topics that are relevant to MODU structures (but differ significantly from fixed installations) and require specific consideration during the design of such MODU structures. They are not in order of importance.
7.2.3.1 Operating Environments
Semi-submersibles
The marine operating environment for a semi-submersible is similar to a fixed installation insofar as the helideck heading is generally fixed as a result of the anchoring arrangement or, if fitted, a dynamic positioning (DP) system.
However, it differs from a fixed installation in that the helideck has a dynamic movement in roll and pitch axes, heave, surge and sway due to the vessels dynamic characteristics.
In addition to wind speed and direction, helideck movement (velocity and accelerations as well as heave amplitude) induced by the floating structure should be fully taken into account during helideck and system design and helicopter operations. See Section 10.
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