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Some Examples:
The examples given here are necessarily limited and short on background information. They cover only a small part of my involvement in one project, the Saga Petroleum a.s. Snorre TLP Development Project.
(See More About Rosewood page for background.)
Plan of one of the four Snorre TLP Mooring Compartments at the start of the platform installation procedure, as drawn by me. (Yes, I've done some AutoCad as well.)
This compartment is 20 metres in diameter with a 6 metre diameter access shaft at its centre.
The approximately 70 black circles represent the stored tether elements, waiting to be screwed together, lowered down through the four tether conduits, and then connected to the foundations on the seabed. Each standard tether element is a steel tubular with 32" outside diameter, 1.5" wall thickness, and a length of 16.4 metres.
Other equipment included the Tensioner/Motion Compensator (TMC, shown in orange) and the Torque Tool (TT, shown mainly in purple).
The TMC was used to lock off the first tether in each mooring compartment, and convert the TLP from a free floating vessel to a secured platform. It included an hydraulic cylinder with a load capacity of about 1300 tonnes and a stroke of over 3 metres.
Elevation through the Snorre Mooring Compartment shown in plan above. This shows one of the standard tether elements being moved around within the compartment, with a man on the walkway giving an idea of the scale.
This drawing gives a hint of the problems in moving and assembling these tether elements in a confined space and on a moving, floating platform.
The various tether components and items of installation equipment were designed and manufactured by sub-contractors, but I was the person with the most complete understanding of how they all fitted together. I wrote a fairly detailed installation procedure and then the specification for the installation contract based on this procedure. This installation contract was awarded to Rockwater, with whom I worked closely and then assisted offshore during the installation operations by acting as advisor.
My involvement in the Saga Snorre Project was as an employee of the Norwegian company Aker Engineering, although in the later stages I was seconded into the Saga Project Team.
Alan Waters (MA, CEng, MIMarE)
Rosewood Engineering Ltd.
2 St Clair Close
Reigate
Surrey
RH2 0QB
United Kingdom
Tel: 01737 248811
Fax: 0870 161 5439
Email: alan@rosewood-engineering.co.uk
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