ANSI HI HYDRAUL HI 9.6.8-2014 Rotodynamic Pumps C Guideline for Dynamics of Pumping Machinery (A142).pdf

1、6 Campus DriveFirst Floor NorthParsippany, New Jersey07054-4406 www.Pumps.org ANSI/HI9.6.8-2014ANSI/HI 9.6.8-2014American National Standard forRotodynamic Pumps Guideline for Dynamics of Pumping MachineryThis page intentionally blank.Hydraulic Institute Standards, Copyright 1997-2014, All Rights Res

2、ervedANSI/HI 9.6.8-2014American National Standard forRotodynamic Pumps Guideline for Dynamics ofPumping MachinerySponsorHydraulic Institute www.Pumps.org Approved October 27, 2014American National Standards Institute, Inc.RecycledpaperHydraulic Institute Standards, Copyright 1997-2014, All Rights Re

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9、7054-4406www.Pumps.org Copyright 2014 Hydraulic InstituteAll rights reserved.No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher.Printed in the United States of AmericaISBN 978-1-935762-27-0Ameri

10、canNationalStandardHydraulic Institute Standards, Copyright 1997-2014, All Rights ReservediiiContentsPageForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii9.6.8 Guideline for dyn

11、amics of pumping machinery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19.6.8.1 Introduction and scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.6.8.1.1 Introduction . . . . . . . . .

12、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.6.8.1.2 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.6.8.2 Overview and releva

13、nce of dynamics considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.6.8.3 When an analysis is recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119.6.8.3.1 System complexity and unit size . . . . . . . .

14、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119.6.8.3.2 Considerations in the specification of dynamic analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169.6.8.4 Introduction to analysis levels . . . . . . . . . . . . . . . . . . . . . . .

15、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279.6.8.4.1 Analysis level definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339.6.8.5 Level 1 analysis (simple methods) . . . . . . . . . . . . . . . . . . . . . . . .

16、 . . . . . . . . . . . . . . . . . . . . . . . . . 369.6.8.5.1 Level 1 recommended analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369.6.8.5.2 Level 1 analysis methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17、. . . . . . . . . . . . . . . . . . 379.6.8.5.3 Pump rotor vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389.6.8.5.4 Pump rotor critical speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18、. . . . . . . . . . . . . . . . . 389.6.8.5.5 The first transverse (lateral) critical speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399.6.8.5.6 For the angular or torsional case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19、. . . . . . . . . . 419.6.8.5.7 Reed critical frequency (RCF) of vertical structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429.6.8.6 Level 2 analysis (intermediate methods). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449.6.8

20、.6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449.6.8.6.2 Individual level 2 analyses: methodology, interpretation of results and validation. . . . . . . . . . . . 449.6.8.7 Level 3 analysis (advanc

21、ed methods) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.6.8.7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.6.8.7.2 Level 3 analyses: methodolo

22、gy, interpretation of results and validation . . . . . . . . . . . . . . . . . . . 53Appendix A Definitions of terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58Appendix B Input data requirements . . . . . . . . . . . .

23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64Appendix C Vertical structure natural frequency considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68C.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . .

24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68C.2 Reed frequency characteristics of vertical structures involving motors . . . . . . . . . . . . . . . . . . . . 68C.3 Motor reed frequency properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25、 . . . . . . . . . . . . . . 68C.4 Use of motor reed frequency properties in a vertical pump/motor structure reed frequency calculation, level 1 analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69C.5 Use of motor reed frequency proper

26、ties in level 2 or level 3 analyses of vertical structures . . . . 70C.6 Graphical depiction of vertical pump/motor structure reed frequency versus motor reed frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71C.7

27、 Job-specific motor reed frequency values for dynamic analysis . . . . . . . . . . . . . . . . . . . . . . . . . 72C.8 Practical considerations vertical pump/motor structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72Appendix D Vertical motor reed critical frequency considerations

28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76D.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76D.2 Motor reed frequency properties . . . . . . . . . . . . . . . . . . . . .

29、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 76D.3 Typical stated motor reed frequency values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78Hydraulic Institute Standards, Copyright 1997-2014, All Rights ReservedivD.4 Motor reed critical frequency impact

30、 test guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80D.5 Job-specific motor reed frequency tested values for dynamic analysis . . . . . . . . . . . . . . . . . . . . 83Appendix E Dynamic analysis sample specifications . . . . . . . . . . . . . . . . . . . . . . . .

31、. . . . . . . . . . . . . . . . . . . . . 84E.1 Instructions for specification writers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84E.2 Separation margin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32、 . . . . . . . . . . . . 84E.3 Dynamic analysis sample specification wording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86Appendix F Dynamic analysis sample specifications, motor reed critical frequency . . . . . . . . . . . . . . . . . . . . . 90F.1 Purpose . . . . .

33、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90F.2 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90F.3 Instructions to s

34、pecification writers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90F.4 Instructions to motor purchasers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90F.5 Sample specification . . . . . . . . . . .

35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90Appendix G Analysis reporting format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92Appendix H Numerical analysis recommendations. . .

36、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94H.1 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94H.2 Model methodology . . . . . . . . . . . . . . . . . . . . . .

37、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94Appendix I Bibliography. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97Appendix J Index . . . . . . . . . . . . . . . . . . . . . . . .

38、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98Figures9.6.8.1.1.1a Flowchart describing workflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39.6.8.1.1.1b Flowchart referencing applicable

39、sections of guideline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49.6.8.1.1.1c Checklist to facilitate use of guideline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59.6.8.1.2a Rotodynamic pump types - overhung. . . . . . . .

40、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89.6.8.1.2b Rotodynamic pump types - between bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.6.8.1.2c Rotodynamic pump types - vertically suspended . . . . . . . . . . .

41、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 109.6.8.3.1a Foundation rigidity, horizontal pump structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149.6.8.3.1b Foundation rigidity, vertical pump structures using motor CG location . . . . . . . . . .

42、. . . . . . . . . . . . 149.6.8.3.1c Foundation rigidity, vertical pump structures using top motor bearing location . . . . . . . . . . . . . . . . 159.6.8.4a Typical Campbell diagram for lateral critical speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319.6.8.4b T

43、ypical mode shape diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329.6.8.4c Typical Campbell diagram for torsional critical speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349.6.8.5.2 Natural freque

44、ncy versus static deflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379.6.8.5.4 Rotor first and second critical speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389.6.8.5.5.1 Rotor critical speed

45、 with single attached mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399.6.8.5.5.3 Rotor critical speed with shaft of negligible mass and several concentrated masses. . . . . . . . . . . 409.6.8.5.6 Simple horizontal centrifugal pump system . . . . . . . . . . .

46、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419.6.8.6.2.1.3 Rotordynamic critical speed map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48C.1 Vertical motor structures. . . . . . . . . . . . . . . . . . . . . . . . . . . .

47、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69C.2 System RCF (cpm) vs. motor RCF (cpm) and motor center of gravity deflection component . . . . . . . . . . 72C.3 Typical vibration signature of discharge head/driver support with driver . . . . . . . . . . . . . . . . . . . .

48、 . . . . . . 73Hydraulic Institute Standards, Copyright 1997-2014, All Rights ReservedvC.4 Structural natural frequency is close to the maximum range of operation rpm. . . . . . . . . . . . . . . . . . . . . . 74C.5 Structural natural frequency is close to the minimum range of operating rpm . . . .

49、. . . . . . . . . . . . . . . . . . 75D.1 Static deflection of motor center of gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76D.2 Reed critical frequency versus static deflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77D.3 Typical range of stated motor reed frequency versus torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78D.4 Typical range of stated motor reed frequency versus motor w