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install flue-gas desulphurisation (FGD) – a state-of-the-

art technology used to remove oxides of sulphur, such

as sulphur dioxide, from exhaust flue gases in power

plants that burn coal or oil. This technology is fitted as

an atmospheric emission abatement technology, in line

with current international practice, to en-

sure compliance with air-quality standards,

especially since the power station is located

in a priority air shed area.

It goes without saying that the dimen-

sions on the site are correspondingly big:

Almost 60-ton heavy steel and concrete

elements have to be moved, and a total of

approximately 115,000 tons of steel will be

installed in the construction.

To aid construction, seven red Wolff

cranes owned by Mitsubishi Hitachi Power

Systems Africa (MHPSA) are currently in

operation.

Four Wolff 1250 B luffing cranes are at

the power plant site where they really earn

their place with their lifting capacity of up to 60 tons.

These cranes also feature the standard Wolff Fine

Positioning controls allowing for a centimetre accurate

positioning of loads. This is of major importance in the

cramped conditions on the construction site.

Despite having a tower height of 120 meters, the

Wolff 1250 B cranes with their 60 m long jibs are only

tied to the stair towers of the boiler plants once.

Andreas Kahl, Managing Director at Wolffkran

explains:

“Working together with MHPSA, our technical

support department developed special collar

frames for the stair towers to enable simple and

yet stable anchoring of the crane to the

structure.”

. “The crane concept envisages that one of

the 1250 B cranes will be relocated to Unit 6 as

construction progresses.”

Luffing Crane On Top Of Boiler Plant

The four red giants are supported by three Wolff 355 B

luffing cranes with 50 m jibs, which were erected directly

on top of the 122 m high boiler plants. In this way, an

overall hook height of 186 meters was achieved with

the use of just one tower segment.

Wolffkran

Contractors World International Vol 7 No 2

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