In industrial process sectors, efficient fluid handling governs the stability of the entire production line. Whether transporting clean water, chemicals or other liquids, industrial centrifugal pumps convert mechanical energy into kinetic energy to maintain steady flow of media at designed rates. Yet because they may appear to be “just pumps”, their selection is often oversimplified into a form-filling exercise. In serving clients across chemical processing, water treatment, metallurgy and energy sectors, Teffiko repeatedly observes that a considerable share of after-sales issues stem not from manufacturing defects, but from misjudged operating conditions at the selection stage — the pump itself functions properly, yet it is tasked with work it was never designed to perform.

The phrase “the pump shall comply with API 676” found within technical specifications is one of the most frequently cited yet widely misunderstood statements in pump procurement. The seller responds “fully compliant”, and the buyer rests assured. Neither statement specifies the edition, data‑sheet options, nor the scope of testing. Six months later, when an inspector asks which clause governed the hydrostatic test, both parties discover they each relied on different editions.

This article introduces the API 610 pump‑type selection matrix, comparing OH1‑OH6 overhung and BB1‑BB5 between‑bearings pump configurations. It covers duty‑based selection logic, typical application scenarios, key updates of the 13th edition, common tender‑document mistakes and practical FAQs for process‑pump specification.