North Sea deal for Forgemasters

Casting off: A 114-tonne casting leaves Sheffield Forgemasters' plant, bound for the middle of the North Sea.
Casting off: A 114-tonne casting leaves Sheffield Forgemasters' plant, bound for the middle of the North Sea.
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SHEFFIELD Forgemasters has completed the first part of a multi-million pound contract to supply crucial components for a North Sea oil platform.

The Brightside Lane company has dispatched a 114-tonne ‘clamp casting’ which will be used to repair the under sea structure of the Siri platform, on the Danish continental shelf.

The six metre long casting, with a 2.8 metre radius is the main part of the platform’s new sub-structure being made by Forgemasters, which is also making 35 flange and spacer castings, that are due to be delivered early next year.

Ian Nicholls, managing director of Vulcan SFM, Forgemasters specialist subsidiary for bespoke products for offshore oil and gas, said: “The particular operating conditions for this clamp mean that high fatigue resistance is critical to the successful operation.

“Castings offer the ideal engineering solution for this type of situation, but the quality of the component is extremely important. Using the known properties of fracture toughness for the cast material and the extreme loading scenarios for the particular operational conditions an engineering critical assessment has been carried out to determine extremely high quality standards.”

The steel used in the casting was developed by Forgemasters to provide the strength, toughness and weldability needed for this type of use and the group’s new research and development subsidiary, RD26, assisted with the design by developing computer simulations showing how the giant clamp would expand and contract after casting and during heat treatment.

Forgemasters says the extreme size and shape of the casting meant it was extremely important to understand the dimensional changes that could take place while the clamp was being made.