scope:

The scope of this guideline includes the rotodynamic pump types listed in Table 20.3.4.2.1. The efficiency values determined by this guideline only apply at the best efficiency rate of flow.

The efficiencies shown in this guideline are those generally obtained using common manufacturing practices and are based on actual data supplied by pump manufacturers. This guideline is provided for informational purposes only and should not be used to determine compliance with any existing or future regulations that set pump efficiency requirements. It is the responsibility of the pump manufacturers to ensure proper understanding and compliance with any regulations that set efficiency requirements applicable to their products.

The efficiency prediction charts (see Figures 20.3.4.2.1a and b) relate to pumps designed, manufactured, and tested in accordance with recognized industry standards (ANSI/HI 14.6 Rotodynamic Pumps for Hydraulic Performance Acceptance Tests, ANSI/HI 11.6 Rotodynamic Submersible Pumps: for Hydraulic Performance, Hydrostatic Pressure, Mechanical and Electrical Acceptance Tests, and ISO 9906 Rotodynamic pumps - Hydraulic performance acceptance tests - Grades 1, 2 and 3).

Purpose

The purpose of this guideline is to support the aims of the Hydraulic Institute by educating the pump user community regarding the impact on rotodynamic pump predicted efficiency from:

• Selection of a pump type or design

• Pump size and rate of flow

• Specific speed

• Wear-induced increased running clearances (leakage losses)

• Surface finish of the hydraulic passages