Industrial cooling | project study
1,270MWe combined cycle gas turbine power genera- tion facility. The site supplies around 1.5m customers. To guarantee proper cooling of the three 430 MW gas turbines in the combined cycle gas turbine power station, and to ensure the cooling water pipe was protected against corrosion and encrustation for decades to come, EDF Energy entrusted the pipe lining project to the Italian construction company Idroambi- ente. It selected SPR Europe’s Tubetex liner system, which met the requirements for trenchless installation within the short project timeframe and could cope with the challenge of the the various 90° elbows of the Bonna cooling pipe (which comprises a steel liner enclosed within a steel reinforced external coating). Idroambiente and its German subcontractor Uniror
commenced the lining project on 3 January this year when cleaning of the six supply and discharge pipes got underway using a special pigging system on the 500mm diameter pipes servicing all three turbine units.
Installation techniques Installation of the Tubetex liners commenced on 8 January and was completed using a reversion drum system within 11 days. The round woven, seamless Tubetex polyester yarn reinforced liner was inserted into each turbine unit supply pipe to a length of 157 m and into each discharge pipe to a length of 113 m. The inner was then shaped and steam cured to create a robust pipe of total length of 710 m. The flexible structure of the uncured fabric tube
accommodates all of the shaped elements in the pipe, dealing especially well with the 90° elbows. During the curing process, the liner is bonded to the steel pipe by the NordiPox TX epoxy resin. According to SPR Europe, this creates a highly stable structure while allowing it to retain sufficient elasticity to compensate for movements and to absorb any impact on the pipe. The seven bends in the supply lines - five bends and two connections for
November 2012 | PIPELINE COATING 27
the discharge pipes - were provided with AMEX seals before the pipe was put into operation. “The West Burton project was considered a resound-
ing success by all those involved, particularly the client. With its coverage and smooth internal surface, corrosion and encrustration of the bonna pipe will be a thing of the past for at least the next 50 years,” says Indroambiente managing director Stefano Dini.
About SPR Europe Headquartered at Schieder-Schwalenberg in Germany, SPR Europe is part of the international SPR (Sekisui Pipe Rehabilitation) Group, which is part of the €5.7bn Japanese Sekisui Group. SPE Europe’s 500-strong workforce provides spiral wound, CIPP and close-fit pipe lining solutions to underground infrastructure, utility and construction companies across Europe. Its three key lining technologies are developed by SPR Europe member companies Sekisui NordiTube, R.Tec and Eslon and are manufactured at plants in Germany, Belgium and the Netherlands. Installation is carried out by KMG Pipe Technologies and Rabmer. ❙
www.sekisuispr.com
Above left: The 500mm diameter
Bonna cooling pipes before lining
Above right:
TubeTex liner and AMEX seal in place in the Bonna pipe
Below:
Installation of the TubeTex liner into the
cooling system using Idroambi- ente’s reversion machine
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