Diagnostikmetoder för ångreglerventil med servomotor
In this bachelor thesis, diagnostic methods for one of Siemens stem inlet control valves have been developed. The work has taken place during ten weeks at Siemens Industrial Turbomachinery AB in Finspång. The company produce steam- and gas turbines and also provides service and maintenance. The purpose with this project has been to develop diagnostic methods that oversee the health of the control valves. By using the developed methods you will know when it?s time for maintenance. With these diagnostic methods it?s possible to some degree leave the predetermined maintenance that Siemens uses today on their control valves. The project has been limited to involve just one of Siemens control valves. The report describes the control valve?s function and the components included in the valve structure. It describes the problems that can occur with the valve and what could be done monitoring it to detect potential failures before they develop into functional failures. A short description of different measuring equipment and how they work is also included. Interviews have been conducted at Siemens, at Linköpings University and also with companies that delivers measuring devises. A visit to follow a vibration measurement of a control valve at Idbäcksverket in Nyköping has also taken place. Another tool that has been used in this work is an FMECA that describes errors that may occur with the control valve and what caused them. Books and the internet have also provided necessary facts. This report presents some recommendations on what to do to monitor health of the control valve and equipment to prevent functional failures. The intention with the report has been to show that the equipment presented here can be used in the future to avoid unnecessary preventive maintenance and eliminate the use of corrective maintenance.