A pulsation analysis performed only at rated speed misses resonance conditions that exist at part speed. Variable speed compressors require a full sweep across the entire operating range.
Pulsation bottles are acoustic filters, not simple volume tanks. Understanding how they attenuate pulsation — and how they can fail to — is essential for anyone specifying compressor packages.
A pulsation analysis is only as accurate as its input data. Inaccurate piping geometry or gas composition are the most common reasons analysis results diverge from field measurements.
API 618 defines three levels of pulsation analysis with different scope and cost. Choosing the wrong level wastes money or leaves compliance gaps — here’s how to choose correctly.
Discovering pulsation problems after fabrication means fixing them within the constraints of what’s already built. Analysis before fabrication means designing them out before anything is cut.