Stress Engineering Services’ Subsea Vibration Data Logger (SVDL) services the need to collect high-quality vibration data for extended periods in increasingly stringent subsea environments. Combined with prediction analysis to assess expected mode shapes and fundamental system frequencies before measurement, and with proper data interpretation and reduction following measurement, the SVDL is a customizable tool that improves operational safety, reduces risk, maximizes uptime and operational efficiency, and improves overall upstream profitability. The SVDL installs directly onto subsea equipment in order to monitor vibration and to assess fatigue. The SVDL operates in two states: long-term-intermittent or short-term-continuous. Housed inside the unit is a triaxial accelerometer. Signals are passed through a low-pass analog filter before being digitized by a high-resolution analog-to-digital converter. In addition to signal filtering, oversampling techniques are employed to maintain the high digitized signal quality. The data logger and custom-designed clamping devices feature a low mass and high-mechanical-impedance structure, ensuring that the vibration signals collected by the logger are not distorted by the mechanical characteristics of the logger system itself, even at measurement frequencies of 50 Hz or greater. The SVDL has a depth rating of 10,000 ft in seawater.
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