Actus des entreprises

CETIM MATCOR co-Launch of a New International Group “JUS” for the Assessment of Ageing Power and Process Plants

In response to the critical need for life extension of high-temperature industrial power and process plants, KMTL and CRIEPI of Japan, ETD of the UK, and CETIMMATCOR of Singapore have joined forces to create the JUS Consortium (Japan, UK, and Singapore). This global alliance offers cutting-edge, quantitative life assessment services for owners and operators of high-temperature plants across a range of industries, including power generation, refining, petrochemical, and nuclear sectors.

As aging fossil fuel and nuclear plants face extended service demands due to environmental restrictions on building new facilities, their role in supporting variable renewable energy sources has become essential. However, this increased demand for flexible operation can accelerate both creep and fatigue damage. Traditional life assessment methodologies, often conservative, rely on minimum material properties as specified by ASME, European, or Japanese standards. Such approaches may underestimate the true remaining life of components, potentially leading to premature and costly repairs or early replacements.

The Problem

A key challenge in life assessment is accurately determining the remaining strength of critical components without causing damage to the materials in use. The EDSE (Electrical Discharge Sampling Equipment), a revolutionary portable spark erosion sampling machine developed by KMTL in Japan, effectively addresses this issue. This tool enables precise, non-damaging sample collection from components of various thicknesses, cutting boat samples ranging from 1 to 20 mm in thickness and of different widths and lengths, even in some of the areas not easily accessible by mechanical boat samplers. By preserving the integrity of the component, EDSE offers a safer alternative to traditional boat samplers.

For example, cutting a miniature 5 mm thick sample for three miniature tensile specimens (used for creep or fatigue testing) from a 25 mm thick wall component has been shown to have little to no impact on the component’s remaining life. However, some plant owners remain hesitant to remove samples of this thickness. In response to this concern, the JUS Consortium has developed ultra-miniature specimen testing techniques for specimens that can be machined from 1mm thick boat samples. This minimises any disruption to the component and provides greater confidence in the component safety.

The Solution

To deliver quantitative and reliable life assessment, the JUS Consortium has pioneered an innovative testing approach using ultra-miniature specimens. This method involves cutting specimens just 1 mm thick and performing tensile creep tests designed to focus stress on the specimen's gauge length, thus ensuring precise and reliable results. This refined testing technique allows for highly accurate, quantitative data on the remaining life of critical components. It has proven superior to the Small Punch Creep test, a method that often produces variable results due to multiple influencing factors.

 

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