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Consideration of the full implications of combined operations and the potential adverse effects on safe helideck operations will be required during design where it is intended to install (permanently or temporarily) an offshore structure (fixed or mobile) in close proximity to another. The operating aspects of combined operations are covered in detail in the UKOOA Guidelines for the Management of Offshore Helideck Operations [Ref: 49].
1000 metres is the required horizontal distance to provide a clear unimpeded 210o Obstruction Free Sector for any operational helideck. Therefore, any structure located closer than 1000 metres in this sector will present an obstruction to potential flight paths.
A structure located within approximately 250 metres of another installation with an operational helideck, and not necessarily within the obstruction free sector, also has the potential to create adverse turbulent and thermal conditions. These conditions can seriously affect helicopter handling, increase pilots’ workload and may impact on safe helicopter operations to that helideck. Adverse turbulent conditions caused by adjacent structures normally emanate from windflows over the structure, gas turbine exhausts thermal effects and process flares. Additionally, adjacent structures and vessels (e.g. shuttle tankers) may also cause hazardous flying conditions due to gas releases during process venting.
The arrangements and configurations defined as ‘Combined Operations’ can vary considerably and are typified by:
1.
One or more fixed installations (manned or normally unattended) bridged to each other
2.
A fixed installation (e.g. NUI) with a Jack-up rig alongside
3.
A fixed or floating structure linked to a nearby sub-sea anchored loading buoy (SALM) equipped with a helideck
4.
Shuttle tanker operations to FPUs, FPSOs and loading buoys
5.
A floatel bridge linked to an Installation (construction and operations support scenarios)
6.
Specialist vessel support operations adjacent to an Installation.
In all the above cases where there is a helideck intended to be used for routine operations, all potential effects on the helicopter operating environment shall be closely examined and the effects quantified and recorded.
(Photograph courtesy of British Gas Plc)
Notes about Figure 8.1: The Jack-Up and Floatel are temporarily located as part of production / drilling operations. Both the Jack-Up and Floatel helidecks are accessible but the Installation helideck is inaccessible so it is NOT IN USE (Landing Prohibited Marker in position). Relative positions of each helideck 210° Obstruction Free Sector are shown approximately (dotted lines).
8.1.2 Main References
CAP 437, Chapter 6.
8.1.3 Design Considerations
8.1.3.1 General Principles
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