Vibrations in piping systems are not an unusual occurrence in industrial plants. During the period of operation, users of these plants have frequently learned to assess and to accept these vibrations on the basis of experience values.
However, with new plants the user is confronted with the problem that these experience values are non-existent. This is the case during start-up when the first alarm indications occur, such as subjective major vibrations, noises caused by secondary effects, screws falling out and similar. An objective assessment of the situation is then required.
The description of the excitation and transmission mechanisms and the assessment of the situation is possible with the measurement of piping, machine and foundation vibrations as well as pressure pulsations in the pipe. In addition, effective reduction measures for improving the situation can be processed on the basis of the available measuring values.
Reduction of piping vibrations: Exact knowledge of the excitation and transmission mechanisms is required for the refurbishment of the vibration situation in piping. If the piping vibrations are subject to the coincidence of acoustical or structure natural frequency with the excitation frequency of the connected machine as a first step, an improvement of the situation can be obtained by means of shifting of the resonance frequency.
The structure natural frequency of a piping can be changed by attaching additional supports. The support must have a sufficient rigidity here because no adequate shifting of the natural frequency can be otherwise obtained. A further measure could be, for example, additional supporting and/or relocating of armatures and valves which can have a considerable influence on the local natural frequency due to their concentrated mass.
If acoustical natural frequencies are responsible for the piping vibrations, the pulsation in the piping can be reduced by means of
3D Piping Models
Agitator / Mixer
Design & Drawings
Agitator / Mixer
Zero Hold up Filter
Cross Country Piping