API 685 is the only standard within the API system specifically governing seal‑less centrifugal pumps. Its current edition is the 3rd Edition, July 2022. It covers two categories: magnetic‑drive pumps and canned‑motor pumps.

Teffiko recognizes that chemical pumps are equipment with high energy consumption in chemical production. Many factory pumps operate far from the best‑efficiency point for long periods, with flow regulated by valve throttling, resulting in substantial waste of electric energy. The losses of chemical pumps mainly fall into three categories: hydraulic loss, volumetric loss and pipeline leakage loss. Energy‑saving retrofitting requires systematic implementation covering selection, maintenance, components, speed regulation, pipelines, operation and maintenance, so as to achieve stable energy consumption reduction and mitigate faults such as cavitation and seal failure.

This guide is compiled and published by teffiko. teffiko specializes in industrial high-temperature fluid transfer and is committed to providing professional high-temperature centrifugal pump selection support and product solutions for the chemical, thermal power, and refining industries. We hope this guide will help engineers and procurement decision-makers match operating requirements more quickly and reduce the cost of trial and error in selection. For further technical consultation or product quotations, please contact the teffiko engineering team.