1. The document discusses standards for pump and motor efficiencies in various countries and regions. It provides details on efficiency curves and requirements for single-stage and multi-stage pumps according to standards in the European Union, China, and ISO.
2. It also discusses the European Union's efforts to promote higher pump efficiencies through establishing minimum efficiency levels and targets to improve efficiencies of 80% of products. Guidelines and curves for acceptable pump efficiencies based on flow rate and head are presented.
3. Comparisons are made between efficiency requirements and curves of different standards, showing the European Union requiring higher efficiencies at lower flow rates and China and CNS standards having lower efficiency values and lacking head corrections.