ARC ENERGY VALVE CLADDING HELPS SEVERN GLOCON WIN AN OILFIELD DEVELOPMENT ORDER
28 November 2011
Weld overlay cladding and fabrication specialist Arc Energy Resources has completed a major contract for the cladding of highly specialised globe valves for Severn Glocon, a world leader in the manufacture of control and choke valves for specialist markets such as oil & gas, LNG and power. These control valves are destined for the Manifa field development in Saudi Arabia, which will eventually produce 900,000 barrels of heavy crude oil a day. Weld overlay cladding has enabled Severn Glocon to overcome the prohibitive cost associated with the casting of corrosion resistant alloy valves, which is the conventional method of protecting them from sour, corrosive gases such as hydrogen sulfide.
Arc Energy Resources contract involved cladding all internal wetted areas of twenty-four globe valves ranging from 6-inch to 24-inch diameters with a 4mm thick metallically bonded layer of a corrosion resistant nickel-based alloy. The largest of the valves, four 24-inch units weighing 12 tonnes each, were among the first to be clad on two new Rotating Head welding machines, which Arc Energy installed late last year at a cost of £500,000. They extend the size and scope of the components the company can process.
Commenting for Arc Energy, managing director Alan Robinson says the vast weight and size of the 24-inch valves would have presented a serious handling challenge for conventional welding workstations, where the overlay cladding is deposited by moving components around a fixed welding torch.
Explaining the significance of the automated Rotating Head machines, he says they are designed to manipulate the welding head around the fixed globe valve, positioning the head to apply the overlay accurately to the complex cast geometries.
He adds that Arc Energy worked with Severn Glocon engineers to develop a geometry that was suitable for cladding, and the new machines certainly justified the investment by effectively applying the essential protective coating in areas that would usually be considered difficult to clad.
Arc Energy’s project management of this contract involved the production of bespoke tooling to handle the various sizes of valves and to meet the varied and difficult access requirements. All twenty-four valves were produced to a strict delivery schedule, with Arc Energy effectively utilising its resources to meet cladding deadlines. Arc Energy also undertook heat treatment after the cladding process, as well as pre- and post-weld NDT testing.
Summing up, Severn Glocon sales director Ron Baker comments: “The close working relationship with Arc Energy helps to ensure that our high-integrity valves meet even the most demanding needs of our customers, whilst still being cost-effective.”
For further information contact Alan Robinson,
Arc Energy Resources Limited Unit 12 Eastington Industrial Estate, Meadow Mill, Eastington, Glos GL10 3RZ Tel: +44 (0)1453 823523 Fax: +44 (0)1453 823623 E-mail: firstname.lastname@example.org Web: www.arcenergy.co.uk