Abstract
This article concerns a reverse engineering-based design process of last stage blade (LSB) for other original equipment manufacturer (oOEM). For Loviisa Power Plant (Finland) GE designed and delivered a set of oOEM LSBs to be fit into existing low pressure (LP) turbine module steam path. Although cost competitiveness is a one of major selection criterion for steam turbine spare parts components supplier, diversification of suppliers is also a strategic for power plant owner. Considered here is a process of reengineering of oOEM LSB and all relevant challenges related to this process especially management of geometry deviations between reverse-engineered and oOEM blade. In this article, there are a design steps described taken to qualify reverse-engineered design. Moreover, a manufacturing process of the LSB is shown.
Highlights
Design descriptionAll relevant to LSB data was obtain from reverse engineering process
In order to verify the strength of the reverse engineered LSB according to GE Power design rules, stress in all relevant LSB feature were compared to permissible values
It can be concluded that all internal GE design rules are fulfilled for reverse engineered LSB for Loviisa power plant
Summary
All relevant to LSB data was obtain from reverse engineering process. For a purpose of the process based on contract agreement, GE was handed four OEM blades from the power plant warehouse. Two of them were used and two were new. An on-site measurement campaign was conducted to capture a relevant rotor geometry i.e. interface between LP rotor and LSB. LSB has a shroud and one dumping wire located in vicinity of a mean diameter. The total blade length is 1103,5mm, whereas airfoil high is 1030mm. The material of OEM was identified as high alloyed steel
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