Lance Access Platforms

Located 40 km southwest of Dalby in Queensland, Braemar 1 power station is adjacent to the QLD-NSW high voltage transmission interconnector and Power Link 320/274 kV substation. It is an integrated 504 MW open cycle gas-fired power station and 150 km high pressure gas pipeline network.

 Braemar Power Station approached Solidtech Engineering Services to provide a solution for accessing the turbine exhaust temperature probes. The probes are radially arrayed in the turbine exhaust diffuser and require both breakdown and preventative maintenance servicing, which has been of some difficulty due to their very limited access.

The access systems are to fit three locations with building structural members differing in location up to 100mm in places, so cost efficiency and practicality of a number of concepts was evaluated.  Other major considerations were structure weight, load capacity, and positioning it within easy access to the probes while maintaining clearance to the diffuser surface.  Not normally a challenge, however for operational reasons the roof needed to remain in place and every platform piece was to be brought into one side door, then positioned and fitted without external craneage.

Laser measurement of the 5.5m diameter exhaust diffuser and internal building structure ensured that the platforms would fit accurately - not only around the exhaust housing but also within pipework, beams, columns and uneven ground heights too.  Solidtech Engineering’s platform structure design achieves all installation requirements with safe and efficient access to each of the lances.  Construction is under way, with the lower platforms already installed at one exhaust and more to follow shortly.