Creep damage indicator module for a valve and actuator monitoring system
AssigneeGeneral Electric Technology GmbH
InventorMartin Reigl
Life of this patent
Estimating the term…
Abstract
The present application provides a method of evaluating valve creep damage in a turbine by a data acquisition system. The method may include the steps of receiving a number of operating parameters from a number of sensors including steam temperatures and steam pressures about the valve over time, generating a design material model for the valve, determining an indicator for consumed creep lifetime based on the steam temperature and steam pressures about the valve over time as compared to the design material model, and altering one or more of the operating parameters and/or initiating repair procedures based upon the consumed creep lifetime indicator.
Claims13
A method of evaluating valve creep damage in a turbine by a data acquisition system, comprising:
- receiving a plurality of operating parameters from a plurality of sensors including steam temperatures and steam pressures about the valve over time;
- generating a design material model of an intended material lifetime for the valve based at least in part on a nominal steam temperature, a nominal steam pressure, and a design intended lifetime;
- determining, using the design material model, an end of life value at which (i) a material stress is equal to the nominal steam pressure, and (ii) a metal temperature is equal to the nominal steam temperature;
- determining an indicator for consumed creep lifetime based on the steam temperatures and steam pressures about the valve over time as compared to the design material model;
- determining an indicator for consumed creep damage based on the steam temperatures and steam pressures about the valve over time as compared to the design material model;
- and
- altering one or more of the plurality of operating parameters or initiating repair procedures based upon the consumed creep lifetime indicator.
A turbine system, comprising:
- a plurality of valves;
- a plurality of sensors capable of receiving turbine and valve operating parameters;
- and
- a data acquisition system, including a processor in communication with the plurality of sensors and wherein the data acquisition system is operable to perform the following operations:
- receiving the plurality of turbine and valve operating parameters from the plurality of sensors including steam temperatures and steam pressures about the plurality of valves over time;
- generating a design material model of an intended material lifetime for the plurality of valves, wherein the generation of the design material model is based at least in part on a nominal steam temperature, a nominal steam pressure, and a design intended lifetime;
- determining, using the design material model, an end of life value at which (i) a material stress is equal to the nominal steam pressure, and (ii) a metal temperature is equal to the nominal steam temperature;
- determining an indicator for consumed creep lifetime based on the steam temperatures and steam pressures about the plurality of valves over time as compared to the design material model;
- determining an indicator for consumed creep damage based on the steam temperatures and steam pressures about the valve over time as compared to the design material model;
- altering one or more of the plurality of turbine and valve operating parameters based upon the consumed creep lifetime indicator;
- and
- providing a warning if the consumed creep lifetime indicator exceeds a predetermined value.
Dependencies are inferred from the claim text.