A survey of "Failure Incidents Experienced in P91/92 components"

Background

Since Grade P91 and P92 steel was introduced in the 1980s as creep strength enhanced ferritic steel, it has been used extensively in high temperature headers and steam piping systems in power and steam generating plant. However, evidence from premature weld failures in P91 steel suggests that design standards and guidelines may be non-conservative for P91 welded pressure components. Incidences of cracking in P91/92 welds have been reported in components with service life significantly less than 100,000 hours leading to safety and reliability concerns worldwide.

As a result, ASME has now introduced a reduction factor of two to the allowable stress for P91 welded pipe. The application of this reduction factor has the effect of reducing the design life of existing P91 components by more than one order of magnitude.

This survey aims to set up a database capturing failure incidents experienced in P91/92 components and correlating their fabrication methods and service histories where possible to enable plant operators to assess the risk of failure of their plant and make an appropriate decision to manage that risk of failure.

The survey should take no more than 5 - 10 minutes to complete and can be saved at any time, to be finished at a later date. If you do not wish to answer any questions, simply leave them blank. It is emphasised that this survey is confidential and you will be given access to the results if you provide a response to this survey.

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