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Material for boiler ducting supplied to power stations

CORE COMPONENT
Turnmill Proquip Engineering is supplying about 120 t a month of boiler ducting material to the Kusile power station

CORE COMPONENT Turnmill Proquip Engineering is supplying about 120 t a month of boiler ducting material to the Kusile power station

Photo by Structa

27th June 2014

By: Mia Breytenbach

Creamer Media Deputy Editor: Features

  

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Manufacturing, machining and refurbishment services engineering company Turnmill Proquip Engineering, a subsidiary of suppliers of steel products and related services Structa Group, is producing material for boiler ducting for cold and hot air and supplying it to State-owned power utility Eskom’s Kusile power station, in Mpumalanga, says Structa Group chairperson Piet Coetzer.

The material includes 16 MO3 material for hot-air ducting and 350 WC material for cold-air ducting. Coetzer explains that 16 MO3 alloyed steel can be used at elevated service temperature and is suitable for pipe material for boilers, superheater tubes, hot steam pipes and in heat exchangers.

He adds that the products for Kusile are manufactured according to the AWSD1.1 specifications for structural welding and the Hitachi specifications for steel fabrication.

“Turnmill Proquip Engineering has supplied Eskom since 2010 with more than 200 t of material for boiler ducting, on behalf of Japanese multinational engineering and electronics conglomerate company Hitachi Power Africa,” Coetzer says, adding that the company is supplying about 120 t a month of the material to the Kusile power station.

Kusile, once finished, will comprise six units, each rated at about 800 MW installed capacity. The erection of the Unit 3 boiler frame was progressing well, while the Unit 2 boiler tube element erection was progressing better than that of Unit 1, Eskom reported last month.

The group also undertook three projects for Medupi last year, including the fabrication of substation steelwork and construction of the exhaust-steam ducting. The total contract value is about R100-million and consists of tubular duct sections of up to 6 m in diameter and plate thicknesses of up to 25 mm. The ducting leads from the plant’s turbine outlet to the steam condenser.

The project, in which Turnmill Proquip Engineering undertook fabrication and painting of 2 500 t of ducting, started in September 2010 and was completed in February last year, Turnmill Proquip GM Carel Pienaar told Engineering News last year.

The Medupi power station – a greenfield coal-fired power plant project, west of Lephalale, in Limpopo – is the fourth dry-cooled power station built in South Africa in 20 years and will be the largest coal plant in the southern hemisphere. The boiler and turbine contracts for Medupi are the largest contracts that Eskom has ever signed.

Medupi’s first unit is expected to be synchronised in the second half of this year, while Kusile’s first unit will follow a year thereafter, Eskom outgoing CEO Brian Dames reported at a media briefing in March.

Further, Coetzer notes that other Structa Group subsidiaries are supplying Eskom with pylons for distribution and transmission lines, substation steelwork and one subsidiary is supplying the water tank, which has a capacity of 3.5 million litres, at Medupi.
Turnmill Proquip Engineering has been in operation since the 1990s and was bought by the Structa Group in 2008. It boasts a yearly turnover of about R150-million, with its product range including general and heavy fabricated equipment and pressurised equipment such as columns, vessels, reactors and shell and tube heat exchangers.

The company also manufactures furnaces, ladles, crane beams, reclaimers, stackers and tripper cars, rotary kilns, scrubbers, ducting and steel stacks, ship loaders and unloaders, silos, charge buckets and dragline components for the mining industry.

Edited by Megan van Wyngaardt
Creamer Media Contributing Editor Online

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