Method and equipment for assessing the life of members put under high in-service temperature environment for long period

A method of assessing the life of a member subjected to a high in-service temperature for a long period comprising the steps of:

• determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and service time period during which the member is used in-service temperature and using data established by calculating the creep damage degree on the basis of cumulative damage rules from the hardness and stress of the member to approximate the relationship between the Larson-Miller parameter and the creep damage degree by an expression including an exponential function;
• and
• estimating the creep damage degree by adding probabilistic statistical processing to the approximate expression.

A method of assessing the life of a member subjected to a high in-service temperature for a long period, wherein the hardness of the member is estimated by an expression given as

• H=(at+b)(βm{square root}{square root over (ln(1−Pf)−1))}
• wherein H is the hardness of the member, t is the total operation time when the hardness of the member is measured, a and b are constants, m is the Weibull coefficient, β is the scale parameter, and Pf is the cumulative probability corresponding to the hardness of the member.

A method of assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated comprising the steps of:

• calculating an estimation parameter which is a function of a set of the start count and thermal stress, and thermal fatigue and damage degree based on cumulative damage rules for the member whose life is to be assessed and establishing data;
• and
• approximating the relationship between the estimation parameter and the thermal fatigue and damage degree by an approximate expression.

A method of assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated comprising the steps of:

• using an estimation parameter which is a function of the start count and thermal stress, and data established by calculating thermal fatigue and damage degree based on cumulative damage rules, for the member whose life is to be assessed, and approximating the relationship between the estimation parameter and the thermal fatigue and damage degree by an approximate expression;
• and
• estimating the thermal fatigue and damage degree by adding probabilistic statistical processing to this approximate expression.

An apparatus for assessing the life of a member subjected to a high in-service temperature for a long period, comprising:

• means for determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and a service time period during which the member is used in-service temperature, and calculating the creep damage degree on the basis of cumulative rules from the hardness and stress of the member to establish data;
• and
• means for approximating the relationship between the Larson-Miller parameter and the creep damage degree by an expression including an exponential function.

An apparatus for assessing the life of a member subjected to a high in-service temperature for a long period comprising:

• means for determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and service time period during which the member is used in-service temperature and using data established by calculating the creep damage degree on the basis of cumulative damage rules from the hardness and stress of the member to approximate the relationship between the Larson-Miller parameter and the creep damage degree by an expression including an exponential function;
• and
• means for estimating the creep damage degree by adding probabilistic statistical processing to the approximate expression.

An apparatus for assessing the life of a member subjected to a high in-service temperature for a long period, wherein the hardness of the member is estimated by an expression given as

• H=(at+b)(β·m{square root}{square root over (ln(1−Pf)−1))}
• wherein H is the hardness of the member, t is the total operation time when the hardness of the member is measured, a and b are constants, m is the Weibull coefficient, β is the scale parameter, and Pf is the cumulative probability corresponding to the hardness of the member.

An apparatus for assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated comprising:

• means for calculating an estimation parameter which is a function of a set of the start count and thermal stress, and thermal fatigue and damage degree based on cumulative damage rules for the member whose life is to be assessed and establishing data;
• and
• means for approximating the relationship between the estimation parameter and the thermal fatigue and damage degree by an approximate expression.

An apparatus for assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated comprising:

• means for using an estimation parameter which is a function of the start count and thermal stress, and data established by calculating thermal fatigue and damage degree based on cumulative damage rules, for the member whose life is to be assessed, and approximating the relationship between the estimation parameter and the thermal fatigue and damage degree by an approximate expression;
• and
• means for estimating the thermal fatigue and damage degree by adding probabilistic statistical processing to this approximate expression.

A method of assessing the life of a member subjected to a high in-service temperature for a long period comprising the steps of:

• inputting a service time period during which the member is used in-service temperature, whose life is to be assessed from a terminal connected to a network;
• and
• according to the input, in a service supplying equipment connected to the network, determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and service time period during which the member is used in-service temperature, assessing the life of the member by the approximate expression including an exponential function of the relationship between the Larson-Miller parameter and the creep damage degree using data established by calculating the creep damage degree on the basis of cumulative damage rules from the hardness and stress of the member, and outputting the assessed life to the terminal.

A method of assessing the life of a member subjected to a high in-service temperature for a long period comprising the steps of:

• inputting a service time period during which the member is used in-service temperature and the hardness of the member whose life is to be assessed from a terminal connected to a network;
• and
• according to the input, in a service supplying equipment connected to the network, determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and time of the member, using data established by calculating the creep damage degree on the basis of cumulative damage rules from the hardness and stress of the member to approximate the relationship between the Larson-Miller parameter and the creep damage degree by an expression including an exponential function and to assess the life of the member by an expression estimating the creep damage degree added with probabilistic statistical processing, and outputting the assessed life to the terminal.

A method of assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated comprising the steps of:

• inputting the start count of the member whose life is to be assessed from a terminal connected to a network;
• and
• according to the input, in a service supplying equipment connected to the network, assessing the life of the member by an approximate expression of the relationship between the estimation parameter and the thermal fatigue and damage degree, which is approximated from an estimation parameter which is a function of the start count and thermal stress, and data established by calculating thermal fatigue and damage degree based on cumulative damage rules for the member whose life is to be assessed, and outputting the assessed life to the terminal.

A method of assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated comprising the steps of:

• inputting the start count and hardness of the member whose life is to be assessed from a terminal connected to a network;
• and
• according to the input, in a service supplying equipment connected to the network, using an estimation parameter which is a function of the start count and thermal stress, and data established by calculating thermal fatigue and damage degree based on cumulative damage rules, for the member whose life is to be assessed, approximating the relationship between the estimation parameter and the thermal fatigue and damage degree, assessing the life of the member by an expression estimating the thermal fatigue and damage degree added with probabilistic statistical processing, and outputting the assessed life to the terminal.

An apparatus for assessing the life of a member subjected to a high in-service temperature for a long period, comprising:

• means for inputting a service time period during which the member is used in-service temperature, whose life is to be assessed from a terminal connected to a network;
• and
• means for according to the input, in a service supplying equipment connected to the network, determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and service time period during which the member is used in-service temperature, assessing the life of the member by the approximate expression including an exponential function of the relationship between the Larson-Miller parameter and the creep damage degree using data established by calculating the creep damage degree on the basis of cumulative damage rules from the hardness and stress of the member, and outputting the assessed life to the terminal.

An apparatus for assessing the life of a member subjected to a high in-service temperature for a long period, comprising:

• means for inputting a service time period during which the member is used in-service temperature and the hardness of the member whose life is to be assessed from a terminal connected to a network;
• and
• means for according to the input, in a service supplying equipment connected to the network, determining a Larson-Miller parameter for the member whose life is to be assessed from the in-service temperature and time of the member, using data established by calculating the creep damage degree on the basis of cumulative damage rules from the hardness and stress of the member to approximate the relationship between the Larson-Miller parameter and the creep damage degree by an expression including an exponential function and to assess the life of the member by an expression estimating the creep damage degree added with probabilistic statistical processing, and outputting the assessed life to the terminal.

An apparatus for assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated, comprising:

• means for inputting the start count of the member whose life is to be assessed from a terminal connected to a network;
• and
• means for according to the input, in a service supplying equipment connected to the network, assessing the life of the member by an approximate expression of the relationship between the estimation parameter and the thermal fatigue and damage degree, which is approximated from an estimation parameter which is a function of the start count and thermal stress, and data established by calculating thermal fatigue and damage degree based on cumulative damage rules for the member whose life is to be assessed, and outputting the assessed life to the terminal.

An apparatus for assessing the life of a member provided in an apparatus which is started and stopped over and over again and subjected to a high in-service temperature for a long period while the apparatus is being operated, comprising:

• means for inputting the start count and hardness of the member whose life is to be assessed from a terminal connected to a network;
• and
• means, according to the input, in a service supplying equipment connected to the network, for using an estimation parameter which is a function of the start count and thermal stress, and data established by calculating thermal fatigue and damage degree based on cumulative damage rules, for the member whose life is to be assessed, approximating the relationship between the estimation parameter and the thermal fatigue and damage degree, assessing the life of the member by an expression estimating the thermal fatigue and damage degree added with probabilistic statistical processing, and outputting the assessed life to the terminal.