METHOD OF LIFE TIME ESTIMATION OF PIT ITEMS OF POWER EQUIPMENT Russian patent published in 2015 - IPC G01N23/00 G01L1/25 

FIELD: power industry.

SUBSTANCE: from pipe worked in power equipment one specimen is prepared, as well as two reference specimens from the pipe that was not operated. According to the relative parameter changes of the elementary cell of the specimen worked in the boiler speed and duration of first area of transient creep is determined on the curve similar to classic creep curve. The first reference specimen is tested by thermal cycling method, and maximum possible relative parameter change of the crystal lattice under thermal loads is determined. The second reference specimen is subjected to cold cyclic deformation, and maximum possible relative parameter change of the crystal lattice under external pressures is determined. By means of summation of the thermal cycling and cold deformation results the maximum relative parameter change of the elementary crystal lattice is determined at area of the accelerated creep achieved upon exhaustion of the item operability life for the time calculated based on the fundamental V.M. Goldschmidt crystal-chemical criterion equal to 15%, and selected as service life of the matrix plasticity. The item service life is determined based on test relationship between the parameter change of the elementary crystal lattice and time similar to the classic creep curve.

EFFECT: increased accuracy of determination of the residual service life of the pipe items of the power equipment.

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