PURPOSE:To miniaturize a device and to automatize an operation by performing security evaluation corresponding to a wide vibration frequency region and the frequency of vibrations and further corresponding to the external diameter and length of piping. CONSTITUTION:When the security of the piping 1 is evaluated, evaluation conditions are set on a console panel 20 by using respective dials 52A, 51A, and 45A for external diameter setting, distance setting, and measurement time setting. Then a relative amplitude detecting means 40 calculates the peak value of a relative amplitude deltaR within a range of measurement time T from the amplitudes delta1 and delta2 and vibration frequency (f) of the piping 1 detected by a vibration detecting meter 31 and a vibration meter 32 for comparison detection and a reference amplitude deltaS is calculated 50 from an equation II based upon the vibration frequency (f), external diameter (d), distance (l), Young's modulus E, service life, and safety factor S; and a display means 34 displays danger, caution, or safety according to the result of comparison 33 between the amplitude deltaS and deltaR.
展开▼
