FIELD: maintenance of steam turbines.
SUBSTANCE: diagnosing is performed for several steps - when manufacturing and inspecting during turbine maintenance. At each step after removing valve drive column the strain gauge is mounted outside steam box of valve. After it impact force is applied to top end of valve excites lateral oscillations and frequency characteristic damping vibrations is recorded. The characteristic is compared with previous ones and change in rigidity of stem and ability of cracking are judged from character of changes. Valve shouldn't be dismounted to detect cracks on stem.
EFFECT: increased efficiency of maintenance.
1 dwg
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