In recent years, also because of the overall contraction of the market, all compressor manufacturers are differentiating their products by offering solutions that optimize/minimize costs while maintaining the same robustness and reliability.

To achieve this goal, the main guidelines are “Power Density” and “Efficiency”.

On hyper compressors for LDPE plants, the absorbed power of the valves has a key role in overall efficiency and, thanks to dedicated development programs aimed to design more and more efficient valves, represents one of the disciplines where it is still possible to improve the performance.

The absorbed power of this type of valves is strictly correlated to their behavior which is challenging to predict because it depends on many factors. The expected macroscopic gas parameters, such as pressure, temperature and gas composition often are not sufficient to properly evaluate valve behavior in the field.

In fact valve operation is highly dependent on local phenomena such as localized pressure losses and presence of vortexes which are in turn influenced by the geometry of the valve and by its behavior.

To better understand all these phenomena it is needed to characterize these valves through experimental tests aimed at defining, with a good precision and accuracy, the valve dimensionless parameters Cd (drag coefficient) and Ks (flow coefficient) as a function of the geometry of the valve itself. If the coefficients Cd and Ks are not accurate, the expected behavior of the valve and, as a consequence the valve losses, may be completely different from the evidence of the field and could not properly explain some unexpected power consumption.

Therefore, through a dedicated characterization of the valves design, it is possible to improve the predictability of the valve, also in terms of power consumption, that contributes to a better evaluation of the total absorbed power by the compressor, which allows designers to reduce their margins of uncertainty.

This content is only available via PDF.
You do not currently have access to this content.