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Trelleborg Offshore has installed its Elastopipe corrosion-free fire safety deluge system on Maersk’s Ngujima-Yin, a floating production storage and offloading (FPSO) vessel.

The new deluge system has been installed to replace the existing carbon steel pipework on seven modules.

The system was installed in less than three months, without disrupting the vessel’s oil-and-gas production schedule.

Christian Eilersen, director of FPSO projects at Maersk, said: ‘Trelleborg provided the complete survey, design, engineering, supply and installation package, as well as removing the old installation.

‘It was important that operation of the FPSO was not affected in any way and that safety was considered of paramount importance,’ he added.

The existing carbon steel seawater deluge system on the seven-module FPSO vessel, located in the Vincent Field off Western Australia, had corroded over the two years since its installation.

The system required constant maintenance, cleaning and testing and a replacement was required to reduce the long-term cost of ensuring essential fire protection.

The challenge with the installation was to replace the existing fire protection throughout the FPSO modules, without affecting the safety of the vessel as it continued output.

The system required 1,687m (5,535ft) of pipework, from 25mm (1in) to 200mm (8in) diameters, and associated fittings and accessories.

Hans-Leo Hals, Elastopipe product group manager at Trelleborg, said: ‘Because Elastopipe is a synthetic rubber-based flexible piping system, it is installed without any welding or other hot work, such as high-speed cutting, which could compromise the safety of the vessel.

‘We installed a temporary Elastopipe deluge system for each module, removed the existing steel pipes, then completed the permanent Elastopipe pipework and fixings and moved the temporary deluge onto the next module.

‘This method ensured that full fire protection was retained throughout the project.

‘In addition, the flexibility and light weight of Elastopipe allow very rapid installation, compared with a rigid pipe system; it can be swiftly configured to confined spaces.

‘The first two modules were completed in just a month, in contrast with the estimated 15 months to install a comparable copper-nickel installation,’ he added.

Said to offer advantages over metal and polymer rigid pipework, Trelleborg’s Elastopipe offers a 30-year minimum maintenance life for fire deluge and sprinkler systems.

Thanks to its corrosion-free performance, system testing frequency can be reduced while maintaining full 24/7 availability.

Elastopipe is resistant to impact and jet fire (1,400C/2,552F for one hour) and its light weight, flexibility, ease of cutting and fitting ensure that installation is quick and simple.

Compared with alternative pipework materials, which need replacing at regular intervals over a platform or vessel lifetime, with frequent testing and maintenance, Elastopipe deluge and sprinkler fire safety systems offer low total life costs, according to Trelleborg.

Trelleborg Harbour Marine

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