Abstract: A repair welding method according to at least one embodiment is for a member in which a first end and a second end of a parent material are connected by welding and includes: a step of removing a portion including at least a part of a first heat-affected zone of an existing welded portion of the member; and a step of performing repair welding after removing the portion. In a cross-section including the parent material and the existing welded portion, all intersection portions between the first heat-affected zone of the existing welded portion and a second heat-affected zone due to the repair welding have an intersection angle between the first heat-affected zone and the second heat-affected zone of 70° to 110°.

Abstract: A diagnosis device for diagnosing a plant based on an operating state of the plant includes a monitoring data acquisition unit configured to acquire a plurality of monitoring data which are measurement values of a parameter related to the operating state of the plant measured at different times, a diagnosis target pattern generation unit configured to generate a diagnosis target pattern that is a plot pattern where each of the plurality of monitoring data is plotted against plant output data of the plant, and a pattern diagnosis unit configured to diagnose the plant based on the plot pattern of the diagnosis target pattern.

Abstract: A repair welding method according to at least one embodiment is for a member in which a first end and a second end of a parent material are connected by welding and includes: a step of removing a portion including at least a part of a first heat-affected zone of an existing welded portion of the member; and a step of performing repair welding after removing the portion. In a cross-section including the parent material and the existing welded portion, all intersection portions between the first heat-affected zone of the existing welded portion and a second heat-affected zone due to the repair welding have an intersection angle between the first heat-affected zone and the second heat-affected zone of 70° to 110°.

Abstract: A diagnosis device for diagnosing a plant based on an operating state of the plant includes a monitoring data acquisition unit configured to acquire a plurality of monitoring data which are measurement values of a parameter related to the operating state of the plant measured at different times, a diagnosis target pattern generation unit configured to generate a diagnosis target pattern that is a plot pattern where each of the plurality of monitoring data is plotted against plant output data of the plant, and a pattern diagnosis unit configured to diagnose the plant based on the plot pattern of the diagnosis target pattern.

Abstract: In a cooling device for a high temperature pipe, a high temperature pipe is efficiently cooled, and cooling performance is improved. A cooling device (10) for a high temperature pipe that cools a surface to be cooled (104) of a pipe (100) as a high temperature pipe includes: a cooling medium supply header (11) that is disposed so as not to shield heat dissipation by radiation from the surface to be cooled (104) to the periphery, and allows a cooling medium to flow out toward the surface to be cooled (104); and a cooling medium supply device (12) that supplies the cooling medium to the cooling medium supply header (11).

Abstract: A method of extending a life expectancy of a high-temperature piping, includes removing a heat insulation material which covers the piping having a high creep rupture risk, and lowering an outer surface temperature of piping, wherein a width of an exposed portion obtained is twice or more a distance from a peeled-off end portion of the exposed portion to a portion where a compressive stress is asymptotical to 0 after a change in stress between a tensile stress and the compressive stress occurring in the piping due to the removal of the heat insulation material is made from the tensile stress to the compressive stress, and the distance is calculated based on the following formulae, ?x=5, ? = 3 ? ( 1 - v 2 ) a 2 ? h 2 4 here, ? is a Poisson's ratio, a is an average radius of the piping, and h is a plate thickness of the piping.

Abstract: A method for trouble managing in equipment is provided, with which optimal timing of repairing the equipment and occurrence of malfunction probable to occur concurrently with present malfunction or later stage can be inferred with sufficient accuracy, and which can be adopted for large-scale equipment used in a plant.

Abstract: A method of extending a life expectancy of a high-temperature piping, includes removing a heat insulation material which covers the piping having a high creep rupture risk, and lowering an outer surface temperature of piping, wherein a width of an exposed portion obtained is twice or more a distance from a peeled-off end portion of the exposed portion to a portion where a compressive stress is asymptotical to 0 after a change in stress between a tensile stress and the compressive stress occurring in the piping due to the removal of the heat insulation material is made from the tensile stress to the compressive stress, and the distance is calculated based on the following formulae, ?x=5, ? = 3 ? ( 1 - v 2 ) a 2 ? h 2 4 here, ? is a Poisson's ratio, a is an average radius of the piping, and h is a plate thickness of the piping.

Abstract: A method for trouble managing in equipment is provided, with which optimal timing of repairing the equipment and occurrence of malfunction probable to occur concurrently with present malfunction or later stage can be inferred with sufficient accuracy, and which can be adopted for large-scale equipment used in a plant.

Abstract: The present invention has as its object the provision of a restoration method for a deteriorated part, which is capable of easily and reliably repairing and restoring a deteriorated part generated in a metal member to reliably prolong the lifetime of the metal member. Specifically, a local heating step of locally heating a deteriorated part C by a main heater 25 and pressure-welding the deteriorated part C by a compression force by thermal expansion and a peripheral heating step of heating the periphery and vicinity of a heated region HA1 in the local heating step by a sub heater 26 are carried out, followed by carrying out a cooling step of cooling the heated region HA1 by the main heater 25 and a heated region HA2 by the sub heater 26 at the same time.