Abstract: To address the low energy efficiency of valve throttling regulation in chemical plant circulating water systems, magnetic speed regulation retrofit was implemented on one 560 kW circulating water pump and one 220 kW cooling tower fan. A multi-parameter synchronous monitoring system was deployed to conduct 30-day comparative data acquisition and analysis of electrical power consumption, vibration intensity, and pipeline network pressure before and after the retrofit. The measured results demonstrate that the circulating water pump achieved an electricity saving rate of 17.78%, the cooling tower fan achieved an electricity saving rate of 16.55%, vibration intensity was reduced by 59.3%, annual comprehensive cost savings reached 781,500 RMB, and the static investment payback period was 2.30 years. The findings validate the energy-saving performance and operational reliability of magnetic speed regulation technology in industrial circulating water systems.