187 Acoustic Enclosure Braemar GT13E2 Outdoor Project Description The outdoor acoustic enclosure is part of a power Station located in the west of Dalby in Queensland Australia. The site is described as Lot 128 on SP121102. The Owner is Wambo Power Ventures (ERM Power + Babcock & Brown Bank). Three units (3xGT13E2-2 MXL, Turnkey EPC), which are designed in an equal way, will be executed. Wendt SIT GmbH & Co. KG was ordered to deliver these acoustic enclosures with completely new design, which is expected to become an execution standard for future projects. The acoustic enclosure is designed for an outdoor arrangement with the benefit to replace the turbine building of the power plant. This way of working leads to an enormous cost reduction and was one of the important arguments for the positive decision of the customer to this kind of execution. The shown acoustic enclosure has the function to reduce noise emissions caused by a gas turbine and its connected generator. The enclosure is divided into 4 different compartments, one for the gas turbine, one for the auxiliary, one for the diffuser and one for the generator. Special operation conditions have to be considered during design period to meet the technical requirements of the project. The enclosed machinery has a big heat loss, so the acoustic enclosure has to be equipped with a ventilation system to fulfil maximum interior temperatures lower than 60°C. Higher temperature inside would be harmful for the electrical equipment and would also not allow access of maintenance personnel during operation. Special attention was paid to the hazardous area inside the gas turbine compartment, which is possible to occur, by a leakage in the turbo machinery system. The acoustic panels of the enclosure have the advantage to be removable without loosing any connection elements. The wall and roof elements are executed weather- and gas tight as well. Over the generator building is a filter house. The loads resulting from it are derived by their own steel structure. The structural steel structure is used to support the piping of the machinery. A lot of interfaces of components by others had to be considered during design period. Several penetrations caused by the generator bus duct, turbine diffuser, ventilation ductwork and piping are integrated into the design of the acoustic enclosure. Static System: The static system of the acoustic enclosure consists in transverse direction of frameworks. The building in the longitudinal direction is stabilized by the roof and vertical bracings. The static analysis acc. EC3 is calculated using a 3D-model to optimise the weight of the structural steel. The columns of the steel structure are aligned in a way that the front flanges of the column sections have the same outline dimensions to allow easily assembly of the wall elements. Therefore additional eccentricities had to be considered. The steel structure is designed for easy disassembly to allow fast access to the machines for maintenance and repair purposes. Wendt SIT GmbH & Co. KG delivered the following components Software: Acoustic design of the enclosure elements including splitters silencers of the ventilation system Complete design, layout -, outline-, detail- & erection drawings Static analysis of the steel structure and structural parts of the enclosure including the consideration of seismic & wind loads. Design of ventilation system, fans and filters Design of electrical equipment & illumination calculation Hardware: Structural steel structure Platforms, stairs and ladders Wall and roof panels Ventilation systems and filters Fans Lighting Seaworthy Packing Technical Data of the enclosure: GT-Compartment Length 13,9 m; Width 7,7 m; Height 8,0 m GENO-Compartment Length 10,9 m; Width 4,9 m; Height 4,2 m AUX-Compartment Length 13,9 m; Width 6,3 m; Height 6,5 m Diffusor-Compartment Length 5,4 m; Width 14,0 m; Height 8,0 m Weight of steel structure: ~ 70 tons per unit Area of wall and roof elements: 1200 m² Program description: Software used for the calculation: ESA-Prima Win 3.60 Advantages of software: During the design phases several calculations were made to find an optimised solution. With ESA-Prima Win it was easy to perform the different checks. The load cases can be easily generated with the graphic load generator The stress calculations and design of frame corners was executed with ESA-Prima Win as well. Special requirements: The calculation considers the local seismic and wind loads (Australian Standard)
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