Protecting Corus nitrogen gas pipeline

Citation

(2001), "Protecting Corus nitrogen gas pipeline", Anti-Corrosion Methods and Materials, Vol. 48 No. 5. https://doi.org/10.1108/acmm.2001.12848eab.003

Protecting Corus nitrogen gas pipeline

Protecting Corus nitrogen gas pipelineKeywords: Winn & Coales (Denso), Pipelines, Corrosion prevention

A new 6km x 300mm diameter nitrogen gas pipeline installed at Corus steelworks in Scunthorpe, UK has been protected with Winn & Coales' Densoclad 70 Tape (Plate 2). It is an addition to the existing trunk line from the nearby BOC site and will carry nitrogen gas at a pressure of 7.5 bar for a variety of uses on the Corus site.

Contractors for the project were Grimsby Pipework Engineering.

Plate 2 Part of the new nitrogen gas pipeline protected with Densoclad 70 Tape at Corus, Scunthorpe (photo courtesy of Corus Construction & Industrial)

Approximately 85 per cent of the new gas line will be at ground level mounted on concrete plinths, 10 per cent is at high level, and 5 per cent is buried.

Densoclad Tapes consist of a thick polymer bitumen adhesive laminated to a tough plasticised pvc backing. These cold applied tapes are designed for protecting buried or immersed pipes and fittings, as well as giving long-life protection above ground.

Winn & Coales also informs us that it is four years since the UK's RPM Group (Repair Protection & Maintenance) Ltd carried out environmental protection work in several plant areas at the Corus steelworks at Scunthorpe. The long term success of this project, plus RPM's proven track record, was a key feature in their obtaining a new contract, via main contractors Amec, for protection work at the Corus Port Talbot steelworks.

A large diameter pipe carrying hot gases from the blast furnace to a gas scrubber had reached the end of its working life. This has been replaced with a similar 96in diameter tapered and welded section which, because of its shape, is described as a lobster back bend. To ensure long life resistance to the hot gases, RPM has applied a lining of Winn & Coales' Archco-Rigidon 403D. This is a polyester based flake glass filled coating claiming excellent corrosion/erosion resistance in highly corrosive environments.

The lining was thickness checked after application and spark tested to ensure a pinhole-free surface.

The West Yorkshire based RPM Group are experienced corrosion engineers and approved applicators of the full range of Winn & Coales' Archco-Rigidon protective coating systems.

Details available from: Winn & Coales (Denso) Ltd. Tel: +44 (0)20 86707511; Fax: +44 (0)20 8761 2456.