25 Marine Lifting & Piling

Marine Lifting & Piling

Lifting Offshore

Lifting offshore is particularly complex because of the nature of marine operations and the need for good sea state, general weather conditions and specialised purpose vessels as well as competent operatives and equipment. Important issues are associated with the responsibilities during the transfer of the asset whether it is monopole, transition piece, tower, nacelle, structure or transformer.

Piling Offshore

When piling offshore a number of considerations are required associated with the vessel sail away and the jack-up support vessel for lifting operations. Prior to commencement of the piling operations a number of environmental and other reports are required including the geology of the seabed and proximity to subsea hazards such as wrecks or UXO and fishing grounds. Once dynamic positioning has been used to establish the point of insertion a percussion hammer is used to pile the monopole into position.

This can only be done when the jack-up vessel has carried out preload tests on its legs on the seabed floor, if the seabed has a very soft silt layer then spud cans may be required to limit leg penetration to avoid a leg-stick which can be very hazardous on a rising spring tide and could cause the jack-up to tilt requiring evacuation of the vessel. Jack-ups also have to be aware of the geology in order to avoid a punch-through of the vessel leg also causing evacuation of the crew. All completed piles will require a marker arrangement with illumination to identify hazard to shipping.
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QHSE services in Quality, Health, Safety, Environment

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