New order for a power plant in India: Siemens to provide cooling tower make-up water treatment equipment

Siemens Water Technologies in India has secured a contract to provide a water treatment system for Torrent Power Limited’s 382.5 megawatt UNOSUGEN gas-based combined cycle power plant in Surat, district Gujarat, India. Siemens will supply two Contrafast Concentric systems, which will treat water from the Tapi River and produce up to 4 million gallons per day (15,142 m3/day) of cooling tower make-up water. The system, which is part of a capacity expansion at the power plant, is scheduled to be commissioned in September 2012.

Power plants need a consistent, reliable source of water for cooling tower make-up that is also cost effective and sustainable. In many cases, cooling tower make-up water must be treated for suspended solids reduction and/or hardness reduction. With properly treated water, the potential for scaling in the cooling tower is significantly reduced. This reduces cooling circuit cleaning requirements, extends the life of the cooling equipment, and reduces the cooling tower blowdown flow to the environment.

The Siemens Contrafast Concentric system supplied for the UNOSUGEN power plant is a highrate clarification and thickening process that consists of a solids contact reaction chamber, clarifier with tube settler and gravity thickener in a single tank. The entire process is contained in a single, unitized steel basin, and is designed to simplify installation time and reduce cost. The design allows up to an 80% reduction in footprint compared to conventional clarification systems, and the process enhances suspended solids’ removal, lime softening and heavy metals removal. Torrent Power chose the Contrafast Concentric system for the UNOSUGEN plant mainly because of the system’s integral solids thickener and minimal footprint.

Siemens Water Technologies in India will engineer and source the system hardware, with design review and on-site technical services provided by Siemens Water Technologies in Ames, Iowa, U.S.A.

Torrent Power is one of the largest private players in India with integrated operations in the power sector. It generates 1,647.5 megawatts of power and distributes to nearly 3 million customers in the cities of Ahmedabad, Gandhinagar and Surat in Gujarat, Bhiwandi in Maharashtra, and Agra in Uttar Pradesh.

Contrafast is a trademark of Siemens and/or its affiliates in some countries.

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The Siemens Industry Sector (Erlangen, Germany) is the worldwide leading supplier of environmentally friendly production, transportation and building technologies. With integrated automation technologies and comprehensive industry-specific solutions, Siemens increases the productivity, efficiency and flexibility of its customers in the fields of industry and infrastructure. In fiscal 2010, which ended on September 30, 2010, revenue from continuing operations of the Industry Sector (excluding Osram) totaled around €30.2 billion. At the end of September 2010, Siemens Industry Sector had around 164,000 employees worldwide without consideration of Osram. Further information is available on the Internet at:

The Siemens Industry Solutions Division (Erlangen, Germany) is one of the world’s leading solution and service providers for industrial and infrastructure facilities comprising the business activities of Siemens VAI Metals Technologies, Water Technologies and Industrial Technologies. Activities include engineering and installation, operation and service for the entire life cycle. A wide-ranging portfolio of environmental solutions helps industrial companies to use energy, water and equipment efficiently, reduce emissions and comply with environmental guidelines. With around 29,000 employees worldwide (September 30), Siemens Industry Solutions posted sales of €6.0 billion in fiscal year 2010.

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