While API 682 covers seals, the 12th Edition of API 610 updates the interface requirements, including:

: Cantilevered impellers (e.g., OH2 centerline-mounted).

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: New guidelines for selecting pumps at their Best Efficiency Point (BEP) to reduce life-cycle costs.

The impeller is mounted on a shaft between two bearing housings (e.g., BB1, BB2, BB3).