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  • 1.
    Larsson, Heléna
    Linköping University, Department of Management and Engineering, Machine Design.
    Omkonstruktion av avtappningens inloppsrör på utloppsdiffusorn på SGT-8002011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this examination paper, the bleed air inlet pipe on the exhaust diffuser for gas turbine STG-800 has been redesigned. The project has been performed at Siemens Industrial Turbomachinery AB in Finspång at the design department for gas turbines, RCTD.

    The aim for this project has been to develop a solution that makes it easier for the welders to mount the inlet pipes at site and to decrease the time for mounting. Another aim for the project has been to make a comparison of cost between the original design and the new design.

    The methodology that has been used in this thesis is the Voice of the customer table and Systematic design based on Vladimir Hubka’s design process, among others. There have also been studies of the original inlet pipe design by looking at drawings and pictures from former site mountings.

    Today, the original inlet pipe is shipped unassembled together with the exhaust diffuser direct from KSG AB in Surte, one of SIT AB’s subcontractors, to be mounted and welded on site. Due to the angled mounting caused by the design of the inlet pipe and the round exhaust diffuser, today’s welding must be made on an elliptic hole. This results in poor fitting of the inlet pipe and the hole and modifications have to be made to make them fit together.

    To find a new design for the inlet pipe, 17 concepts was created from interviews and brainstorming. Of those, nine was singled out and further evaluated by the developed criterions of the customer. This evaluation resulted in rejection of three more concepts. Last, the three maintaining concepts were compared and one final concept was selected.

    The new concept consists of two pipes. The upper pipe has the same inner diameter as the outer diameter of the downer pipe. This brings the opportunity for adjustments in height and angle to fit the bellow that does connect the inlet pipe with the bleed air pipe. The upper pipe has been welded on to the exhaust diffuser before it was shipped to site. To mount these two pipes together, they must be welded, even if the assemblers hoped this type of mounting would be avoided. This has been solved by designing round pipe endings. It is also most likely possible to make the design with reduced diameter, which will decrease the weight of the product.

    This new design will approximately decrease the mounting time on site up to 60 % in comparison with the original design. This will result in decreased installation cost. Due to the upper pipe’s need for mounting before it is shipped to site, the manufacturing cost will approximately be the same as for the original pipe. The total cost for both pipes will be decreased with approximately 45 %, compared to the original pipes.

    Hopefully, an interest has been generated at SIT AB by this project to make a change of the design for this component, to make the mounting easier in the future.

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