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TagsPump Standardization Quality (Business) Consensus Decision Making Units Of Measurement
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ANSI/HI 9.8-2012

American National Standard for

Rotodynamic
Pumps
for Pump Intake Design

http://www.pumps.org

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Contents
Page

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

9.8 Pump intake design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

9.8.1 Design objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

9.8.2 Intake structures for clear liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

9.8.2.1 Rectangular intakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

9.8.2.2 Formed suction intakes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

9.8.2.3 Circular pump stations (clear liquids) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

9.8.2.4 Trench-type intakes (clear liquids) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

9.8.2.5 Tanks - pump suction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.8.2.6 Can vertical turbine pump intakes (clear liquids), including those with submersible
motors (refer to Appendix G) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

9.8.2.7 Unconfined intakes (Figure 9.8.2.7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9.8.3 Intake structures for solids-bearing liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.8.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.8.3.2 Trench-type wet wells for solids-bearing liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9.8.3.3 Circular plan wet pit for solids-bearing liquids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9.8.3.4 Rectangular wet wells for solids-bearing liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9.8.4 Physical model studies of intake structures and pump suction piping . . . . . . . . . . . . . . . . . . . . . 32

9.8.4.1 Need for a physical model study. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.8.4.2 Physical model study objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

9.8.4.3 Physical model similitude and scale selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

9.8.4.4 Physical model study scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.8.4.5 Instrumentation and measuring techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.8.4.6 Test plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.8.4.7 Acceptance criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.4.8 Report preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.5 Inlet bell design diameter (D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.5.2 Objective. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.6 Required submergence for minimizing surface vortices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

9.8.6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

9.8.6.2 Controlling parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

9.8.6.3 Application considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

9.8.7 Use of computational fluid dynamics (CFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.8.7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.8.7.2 Simulation methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

9.8.7.3 Correlation of simulation and experimental results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

9.8.7.4 Acceptable uses of computational fluid dynamics (CFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Hydraulic Institute Standards, Copyright © 1997-2012, All Rights Reserved

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9.8.8 Glossary and nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

9.8.8.1 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

9.8.8.2 Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Appendix A Remedial measures for problem intakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Appendix B Sump volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Appendix C Intake basin entrance conditions, trench-type wet wells for solids-bearing liquids . . . . . . . . . . . . 79

Appendix D Performance enhancements for trench-type wet wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Appendix E Aspects of design of rectangular wet wells for solids-bearing liquids . . . . . . . . . . . . . . . . . . . . . . 89

Appendix F Suction bell design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Appendix G Submersible pumps – well motor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Appendix H Modification of existing pumping systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Appendix I Alternate formed suction intake designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Appendix J Rectangular intakes for shallow liquid source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Appendix K Influence of pump selection on intake design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Appendix L References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Appendix M Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Figures

9.8.2.1.4a — Rectangular intake structure layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

9.8.2.1.4b — Filler wall details for proper bay width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

9.8.2.2.2 — Formed suction intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

9.8.2.3.1a — Wet-pit duplex sump with pumps offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9.8.2.3.1b — Wet-pit duplex sump with pumps on centerline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9.8.2.3.1c — Dry-pit/wet-pit duplex sump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9.8.2.3.1d — Wet-pit triplex sump, pumps in line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9.8.2.3.1e — Wet-pit triplex sump, compact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9.8.2.3.1f — Dry-pit/wet-pit triplex sump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9.8.2.4.1a — Trench-type wet well . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

9.8.2.4.1b — Trench-type wet well with formed suction inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

9.8.2.5.4 — Datum for calculation of submergence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

9.8.2.5.5 — Definitions of V and D for calculation of submergence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

9.8.2.6.4 — Open bottom can intakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

9.8.2.6.5 — Closed bottom can . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9.8.2.7 — Unconfined intakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.8.3.2.2 — Open trench-type wet well . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9.8.3.3.1a — Circular wet pit with sloping walls and minimized horizontal floor area (dry-pit pumps). . . . . . . . . . 29

9.8.3.3.1b — Circular wet pit with sloping walls and minimized horizontal floor area (submersible
pumps shown for illustration). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9.8.3.3.1c — Circular wet pit with sloping walls and minimized horizontal floor area (wet-pit pumps shown for
illustration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Hydraulic Institute Standards, Copyright © 1997-2012, All Rights Reserved

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Units of measurement

Metric units of measurement are used; and corresponding US customary units appear in brackets. Charts, graphs,
and sample calculations are also shown in both metric and US customary units. Since values given in metric units
are not exact equivalents to values given in US customary units, it is important that the selected units of measure to
be applied be stated in reference to this standard. If no such statement is provided, metric units shall govern.

Consensus for this standard was achieved by use of the Canvass Method

The following organizations, recognized as having an interest in the standardization of centrifugal pumps were con-
tacted prior to the approval of this revision of the standard. Inclusion in this list does not necessarily imply that the
organization concurred with the submittal of the proposed standard to ANSI.

A.W. Chesterton Company
Alden Research Laboratory, Inc.
Bechtel Power Corporation
Black & Veatch (B & V)
Brown and Caldwell
Budris Consulting
Clemson Engineering Hydraulics, LLC
DuPont Company
ekwestrel corp
GIW Industries, Inc.
Gorman-Rupp Company
Healy Engineering, Inc.
J.A.S. Solutions Ltd.
John Anspach Consulting
Kemet Inc.
LVVWD - Las Vegas Valley Water District

Mechanical Solutions, Inc.
MWH Americas, Inc.
Northwest Hydraulic Consultants
Patterson Pump Company
Peerless Pump Company
Powell Kugler, Inc.
Pump Design, Development & Diagnostics, LLC
Sanks, Robert
Sulzer Pumps (US) Inc.
Wasserman, Horton
Weir Floway, Inc.
Weir Minerals North America
Whitley Burchett & Associates
Xylem Inc. - Applied Water Systems
Xylem Inc. - Water Solutions

Committee list

Although this standard was processed and approved for submittal to ANSI by the canvass method, a working com-
mittee met many times to facilitate its development. At the time the standard was approved, the committee had the
following members:

Chair – Jack Claxton, Patterson Pump Company

Committee Member Company
Stefan Abelin Xylem Inc. - Water Solutions
Tom Angle Hidrostal
John Anspach John Anspach Consulting
Bill Beekman Consultant
Al Behring MWH Americas, Inc.
Michael Cugal Weir Minerals
Michael D'Ambrosia Retired
Thomas Demlow Northwest Hydraulic Consultants
Randal Ferman ekwestrel corp
Peter Garvin Bechtel Corporation
James Healy Healy Engineering, Inc.
Thomas Hendrey Whitley Burchett & Associates
Michael Hiscock South Florida Water Management Dist.
Andrew Johansson Alden Research Laboratory, Inc.
Garr Jones Brown and Caldwell
Dimitar Kalchev Peerless Pump Company
Mika Kaplan King County
Yuri Khazanov InCheck Technologies Inc.

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ix

Committee Member (continued) Company (continued)
Robert Krebs Krebs Consulting Service
Zan Kugler Powell Kugler, Inc.
Frederick Locher Bechtel Corporation
Patrick Moyer Weir Specialty Pumps
Richard O'Donnell Xylem Inc. - Water Solutions
Mizan Rashid ENSR
James Roberts Xylem Inc. - Applied Water Systems
Robert Rollings DuPont Company
Robert Sanks Montana State University
Arnold Sdano Pentair
Tino Senon MWH
Theodore Stolinski Black & Veatch (B & V)
Ernest Sturtz CDM Smith
James Torony Sulzer Process Pumps
Greg Towsley Grundfos North America

Alternates Company
Charlie Allaben Allaben Consulting
Ed Allis Retired
Lech Bobowski Peerless Pump Company
Zbigniew Czarnota ITT Flygt
George Hecker Alden Research Laboratory, Inc.

Hydraulic Institute Standards, Copyright © 1997-2012, All Rights Reserved

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