Most compressors produce more capacity than needed to allow for process control. The excess capacity is typically recycled to the inlet of the compressor to meet demand. The energy required to recycle the excess capacity is wasted.
Variable capacity control systems give operators the ability to adjust compressor capacity to demand, eliminating recycle. This reduces energy usage and operating costs.Variable capacity control devices are becoming more prevalent in the process market because of increased energy costs and the desire to save energy and related expenses whenever possible.
