Underhållskoncept : tillståndsbaserat underhåll på smörj- och hydrauloljesystem

Sammanfattning: Abstract This report describes our ten week long thesis work which is the last task in our education in mechanical engineering at Linköpings University. The project has been performed at Siemens Industrial Turbomachinery AB’s service department. The company which is located in Finspång produces, sells and provides service for steam and gas turbines around the world. The purpose of this project is to help Siemens develop their maintenance programs for two of the auxiliary systems which are a part of the complete steam turbine system. These are lube and control oil systems. The project is restricted to two of Siemens maintenance products, No Stop Check (NSC) and the annual Safety Inspection (SI). Some parts of the major and limited overhauls have also been investigated. During the work different maintenance concepts have been investigated and evaluated. Focus has been centered on finding possible solutions that allow maintenance work while the steam turbine system is running. The economical consequences are enormous if the turbine has to be shut down. This due to today’s expanded capacity of the plants. Many discussions and interviews have taken place during the project. Information has also been obtained from documents, literature and the Internet. A Failure Mode and Effect Criticality Analysis (FMECA) has also been input for the task, especially while maintenance measures and concepts were discussed. The present maintenance that Siemens supplies are mostly based on time and experience. We have tried to implement a more condition based maintenance. A lot of time has therefore been spent finding methods for reliable measuring of the machinery condition. The work has generated a lot of different recommendations for the future maintenance. These are more or less condition based and tailor-made for Siemens steam turbine systems. We hope that these propositions will be used in the future maintenance work and also to give some new ideas on how to develop the condition based maintenance at Siemens.