MSI conducted specialized vibration testing of a digester complex compressor piping in the US-Midwest. The main purpose of the testing was to find the root cause for the elevated noise levels.
MSI performed specialized vibration testing that included experimental modal analysis (EMA), continuous monitoring, operating deflection shape (ODS) characterization, and collected motion magnified video data using VibVue™. This testing indicated that beating phenomena was occurring because of slight variations in the compressor speeds, causing the pressure excitation to rise and fall in severity as the pulsations from each compressor drift in and out of phase with each other. While acoustic resonance was not contributing to the problem, the impact testing revealed a mechanical natural frequency in the piping system near the pressure pulsation frequency of 20 Hz that was exacerbating the problem.
Locations of the twelve triaxial accelerometers used
Vibratory response of the pipes at the indicated measurement location and direction.
Frequency response function plot of a modal impact test point.
Pipe hangers of particular importance to contain the motion exhibited during noisy periods.
A major pump OEM called on MSI to help resolve multiple pump driveshaft failures for an ore mining company in East Africa.
To identify potential opportunities for early bearing failure, MSI performed experimental modal analysis (EMA) and operational deflection shape (ODS) tests on a prototype unit for the manufacturer.