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Pressure drop has been used for more than half a century to control resonant pulsation in reciprocating compressor piping. Although avoiding these resonances is the preferred method, this is not possible in many high-speed/variable-speed installations. In these cases, resonant pulsation is often managed by using orifice plates to dampen the response. Helmholtz absorbers are an old technology, used to improve the acoustics of ancient Greek theaters and modern recording studios alike. Although their application in the field of piping acoustics has been well documented, this paper presents new ways in which they have not yet been applied. In this paper, experimental data is shown for a self-tuning Helmholtz absorber, or Side Branch Absorber (SBA) used to cancel a piping length resonance, and for a Virtual Orifice that is used to reduce cylinder nozzle pulsation. These devices open up new doors for controlling pulsation with reduced horsepower costs in reciprocating compressor installations.Copyright © 2007 by ASME |
