对三个加拿大供水系统如何选择泵送方案的分析包括一系列泵送曲线，这些曲线表明了每个装置考虑的替代方案的相对运行范围和效率。双速双绕组电机虽然最初比恒速电机的成本稍高，但更有效地满足了两个系统的特定泵送要求，因此在功率需求方面，寿命成本将显著降低。 广泛覆盖范围的恒速离心泵被确定为更有效地用于休伦湖的开放供水。包括4个参考文献、表格和图表。

This analysis of how pumping schemes were selected for three Canadian water supply systems includes a series of pump curves that indicate the comparative operating range and efficiency of the alternatives considered for each installation. Dual-speed, 2-winding motors, although somewhat more costly initially than constant-speed motors, met the specific pumping requirements of two systems so much more efficiently that the lifetime costs will be significantly reduced in terms of power demand. Constant-speed centrifugal pumps with a broad range of coverage were determined to be more efficient for an open water supply obtained from Lake Huron. Includes 4 references, tables, figures.