Service life management system for high-temperature part of gas turbine

A life management system for high-temperature parts of a gas turbine which manages lives of parts composing the gas turbine and being arranged in a channel of combustion gas thereof, wherein:

• the life management system comprises client systems, each of which is dedicated for each one of operations management, maintenance, design, and material data of the gas turbine;
• and a server system that integrates these client systems and manages a database for a whole system;
• wherein each of the client systems is set to have a function for performing access and entering data to the database, the server system saves a program for performing analysis necessary for the life management, and each of the client systems and the server system are connected via an Intranet,
• wherein the life management system is equipped with means comprising:
• a device for monitoring an operation pattern of the gas turbine;
• a database for storing relationships between the operating parameters of the gas turbine and damage or damage growth rate of the parts of the gas turbine;
• and
• a computer for analytically predicting the damage growth of the parts from the monitored operation pattern, wherein the means computes coefficients and indexes representing effects of the operating parameters on the damage growth rate according to both damage data of the parts and operation history of the gas turbine, performs arithmetic execution by applying these as acceleration coefficients for the damage growth to the damage growth analysis that is executed by the computer, and computes and displays damages and the remaining lives of the parts or the amount of damage at time of next inspection,
• wherein the life management system has a database pertaining to repairing methods corresponding to damage occurring in a part in use as well as the life extension rate and costs when one of these repairing methods is applied, and
• means for judging a repairing method that satisfies requirements concerning a given operation schedule and costs corresponding to the damages of the parts of the gas turbine using the data of the database, and
• wherein the life management system has either of means for judging whether a cost per unit operating time is reduced by applying the thermal barrier coating and means for finding a time of coating application that reduces the cost, both means being driven with the use of a group of data comprising:
• data of the amount of reduction of the stress versus the temperature when thermal shield coating is applied on a member surface of the part of the gas turbine that is obtained through the structure analysis with varied thermal boundary conditions;
• data of a life extension rate attained by the thermal barrier coating that is obtained through the damage growth analysis based on the amount of reduction of the stress;
• and
• data of costs pertaining to the thermal shield coating.