Troubleshooting, Research, Failure Analysis, and Design for Fluid Systems:

Fluid Flow, Water Hammer, Structures, Piping, Pumps, Insrumentation, and Vibrations

LEISHEAR ENGINEERING, LLC

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Robert A. Leishear, Ph.D, P.E.

Consulting Engineer, ASME Fellow

​NACE Senior Internal Corrosion Technologist

Stop pipe system problems that include: water main breaks, fluid flow problems, pump and compressor failures, and pipeline explosions

TECHNICAL PUBLICATIONS

Robert A. Leishear, PhD., P.E.

ASME Textbooks: Piping System Design, Fluid Mechanics, Water Hammer, and Failure Analysis

1. "Fluid Mechanics, Water Hammer, Dynamic Stresses, and Piping Design", R. A. Leishear, 2013, Text book, ASME Press, New York, New York.
2. "Supplement to Fluid Mechanics, Water Hammer, Dynamic Stresses, and Piping Design", R. A. Leishear, 2015, Textbook, ASME Press, New York, New York.


Explosions in Gas Pipelines


​3. "The Primary Cause of Oil and Gas Pipeline Spills and Explosions", R. A. Leishear, 2019, Empowering Pumps eMagazine.


Explosions in Nuclear Power Plants


4."The TMI-2 Explosion",  ANS Nuclear News Magzine 2019, R. A. Leishear.

5. "The Autoignition of Nuclear Power Plant Explosions", 2019, R. A. Leishear, ASME Journal of Nuclear Engineering and Radiation  Science.

6. "Pump Start-ups Ignite Nuclear Power Plants, History, Law, and Risk", 2018, R. A. Leishear, Pressures Surge Conference, BHR Group.

7. "Nuclear Power Plant Fires, and Explosions, Accident Overviews", 2017, R. A. Leishear, American Nuclear Society Winter Conference.

8."Nuclear Power Plant Fires, and Explosions, I, Plant Designs and Hydrogen Properties", 2017, R. A. Leishear, ASME Pressure Vessels and Piping Conference.

9. "Nuclear Power Plant Fires, and Explosions, II, Hydrogen Ignition Overview", 2017, R. A. Leishear, ASME Pressure Vessels and Piping Conference. 

10. "Nuclear Power Plant Fires, and Explosions, III, Hamaoka Explosion", 2017, R. A. Leishear, ASME Pressure Vessels and Piping Conference.
11. "Nuclear Power Plant Fires, and Explosions, IV, Water Hammer Ignition Mechanisms", 2017, R. A. Leishear, ASME Pressure Vessels and Piping Conference.
12. “From Water Hammer to Ignition, The Spark That Ignited Three Mile Island Burst From a Safety Valve”, 2014, R. A. Leishear, ASME, Mechanical Engineering Magazine.
13. “Explosions: A Fresh Look at Chernobyl, Three Mile Island, the Gulf Oil Spill, and Fukushima Daiichi”, R. A. Leishear, December, 2013, Mensa World Journal, Caythorpe, United Kingdom.
14. “Pipeline Explosions, A New Theory”, 2013, R. A. Leishear, ASME, Mechanical Engineering Magazine.

15. “A Hydrogen Ignition Mechanism for Explosions in Nuclear Facility Pipe Systems”, R. A. Leishear, 2013, Journal of Pressure Vessel Technology, ASME.
16. “Hydrogen Ignition Mechanism for Explosions in Nuclear Facility Pipe Systems”, Leishear, R. A., 2010, ASME, Pressure Vessel and Piping Conference.

Water Main Breaks and Corrosion


17. "Fluid Transients and B31D", 2019, ASME Code Committee presentation, B31.1, B31.3, B31.4, B31.8, MDC, and Non-metallic Piping. 

18. "Fatigue Strength Reduction Due To Grit Blasting for Coating Adherence", 2020, NACE Corrosion Conference and Expo (in review).

19. "We Can Stop Nearly $1,700,000,000,000 in U.S. Water Main Breaks", R. A.Leishear, 2019, NACE Materials Performance Magazine (in review).

20. "Water Hammer Causes Water Main Breaks", 2019, R. A. Leishear, ASME Journal of Pressure Vessel Technology.

21. "Water Main Breaks Can Be Stopped", 2019, R. A. Leishear, Aiken Standard newspaper, Aiken, South, Carolina.

22. "We Can Stop a Trillion Dollars ($1,000,000,000,000) in US Water Main Failures", 2019, The Water Wellspring ... Water and Waste Water Information, South Carolina Office of Regulatory Staff.

23. " Stop Costly Water Main Breaks Before They Happen", R. A. Leishear, 2018, American Water Works Association, OpFlow Magazine (in-process).

24. "Water Main Failures, Water Hammer, Corrosion and Fatigue Failures", R. A. Leishear, 2018, American Water Works Association, ACE Conference and Ex​hibition
25. "Water Main Failures Due to Water Hammer - A Billion Dollar a Year Problem", R. A. Leishear, 2018, Empowering Pumps eMagazine.

26. "Grit Blasting for Coatings Accelerates Piping and Structural Failures", 2019, Empowering Pumps eMagazine.


Water Hammer, Pipe Stresses, Plasticity, Fracture Mechanics, and Fatigue


27. "Water Hammer and Piping Stresses Tutorial", 2018, Leishear, Pump Users Symposium.

28. "When the Joukowski Equation Does Not Predict Maximum Water Hammer Pressures", T. Walters and R.A. Leishear, 2018, ASME, Pressure Vessel and Piping Conference.

29. “Editorial on Water Hammer”, 2013, R. A. Leishear, Machine Design Magazine.

30. "Water Hammer Piping Damages in Nuclear Facilities", Safety Analysis Conference, Energy Facility Contractor's Group, Hanford Washington.

31. “Water Hammer in an Open End Pipe”, Leishear, R. A., 2008, ASME, Pressure Vessel and Piping Conference.
32. “Stresses in a Cylinder Subjected to an Internal Shock”, Leishear, R. A., 2007, ASME Journal of Pressure Vessel Technology.
33. “Dynamic Stresses During Water Hammer, A Finite Element Approach”, Leishear, R. A., 2007, ASME Journal of Pressure Vessel Technology.
34. “Derivation of Hoop Stress Equations Resulting from Shock Waves in a Tube”, Leishear, R. A., 2007, Joint ASME Pressure Vessel and Piping Division Conference.
35. “Comparison of Experimental to Theoretical Pipe Strains During Water Hammer”, Leishear, R. A., 2006, Joint ASME Pressure Vessel and Piping Division  / International Council of Pressure Vessel Technology Conference.
36. “Application of a Dynamic Stress Theory to Pipe Leaks”, Leishear, R. A., 2006, Joint ASME Pressure Vessel and Piping Division / International Council of Pressure Vessel Technology Conference.
37. “Experimental Determination of Water Hammer Pressure Transients During Vapor Collapse”, Leishear, R. A., 2006, Joint ASME Pressure Vessel and Piping Division / International Council of Pressure Vessel Technology Conference.
38. “Dynamic Stresses During Structural Impacts and Water Hammer”, 2005, R. A. Leishear, Doctoral Dissertation, University of South Carolina.
39. “Water Hammer Pressure Transients in a Closed Loop System”, Leishear, Morehouse, 2004, Joint Heat Transfer and Fluids Engineering Conference.
40. “Dynamic Pipe Stresses During Water Hammer, V, Applications”, Leishear, Morehouse, 2003, International Mechanical Engineering Congress and Exposition.
41. “Dynamic Pipe Stresses During Water Hammer, IV, Elastoplasticity in Thick Walled Tubes”, 2003, Leishear, Morehouse, ASME / JSME Fluids Conference.
42. “Dynamic Pipe Stresses During Water Hammer, III, Complex Stresses”, Leishear, 2002, Pressure Vessel and Piping Conference.
43. “Dynamic Pipe Stresses During Water Hammer, II, A Vibration Analysis”, Leishear, 2002, Pressure Vessel and Piping Conference.
44. “Dynamic Pipe Stresses During Water Hammer, I, A Finite Element Analysis”, Leishear, Rhodes, Alford, Young, 2002, Pressure Vessel and Piping Conference.
45. “Maximum Stresses Resulting from a Water Hammer Induced Shock Wave: A Comparison of Finite Element to Vibration Analysis Techniques”, 2001, R. A. Leishear, Master’s Thesis, University of South Carolina.
46. “Stresses In a Cylinder Subjected to an Internal Shock”, Leishear, 2005, Pressure Vessel and Piping Conference.

Mixing Technology, Mass Transfer, and Computational Fluid Dynamics

47. “CFD and Safety Factors”, 2013, Leishear, Lee, Stefanko, Fowley, Poirier, Steeper, Ervin,Van Pelt, Harp, Giddings, ASME, Mechanical Engineering Magazine.
48. “Mixing in Million Gallon Tanks”, Leishear, R. A., Poirier, M. R., and Fowley, M. D., Lee, S. Y., 2013, Waste Management Symposium.
49. “Blending Analysis for Radioactive Salt Waste Processing Facility”, 2012, Lee, S. Y., Leishear, R. A. , Advances in Thermal Hydraulics, Curan Associates, Red Hook, New York.
50. “Comparison of Experiments to CFD Models for Mixing Using Dual Opposing Jets in Tanks With and Without Internal Obstructions”, 2012, Leishear, R. A., Lee, S. Y.,  Poirier, M. R., Fowley, M. D., and Steeper, T. J., J Fluids Eng- Trans ASME.
51. “Comparison of Experimental Results to CFD Models for Blending in a Tank Using Dual Opposing Nozzles”, 2011, Leishear, R. A., Poirier, M. R., and Fowley, M. D., Lee, S. Y., Steeper, T. J.., 2011, ASME, International Mechanical Engineers Congress and Exposition.
52. “Blending Time and Velocity Variations During Blending in a Tank Using Dual Opposing Jets”, 2011, Leishear, R. A., Fowley, M. D., Poirier, M. R., Lee, S. Y., and Steeper, T. J., 2011,ASME, International Mechanical Engineers Congress and Exposition.
53. “Incipient Sludge Mixing in Radioactive Liquid Waste Storage Tanks During Salt Solution Blending”, 2011, Leishear. Fowley, Steeper, Poirier, Parkinson, Lee, Waste Management Symposium.
54. “Cooling Coil Effects on Blending in a Pilot Scale Tank”, Leishear. Fowley, Steeper, Poirier, 2010, North American Mixing Forum, American Institute of Chemical Engineers Conference.
55. “Mass Transfer Coefficients for a Non-Newtonian Fluid and Water With and Without Anti-foam Agents”, 2010, Leishear, Restivo, Sherwood, Guerrero, ASME, J Fluids Eng- Trans ASME.
56. “Effects of Oxygen and Air Mixing on Void Fractions in a Large Scale System”, Leishear, R. A., Restivo, M. L., Guerrero, H. N., Sherwood, D. J, 2009, American Institute of Chemical Engineers Annual Conference.
57. “Analysis of Turbulent Mixing Jets in a Large Scale Tank”, 2008, Lee, S. Y., Leishear, R. A., Dimenna, R., Stefanko, D. B., ASME J Fluids Eng- Trans ASME.
58. “Mixing in Large Scale Systems”, Leishear, R. A., Restivo, M. L., Guerrero, H. N., Sherwood, D. J., 2008, American Institute of Chemical Engineers Annual Conference.
59. “Bubble Formation in Large Scale Systems”, Leishear, R. A., Restivo, M. L., Sherwood, D. J., IMECE2008-66009, 2008, ASME Fluids Conference.
60. “Mass Transfer Coefficients in Large Scale Systems”, Leishear, R. A., Restivo, M. L., Guerrero, H. N., Sherwood, D. J., ASME, 2008, IMECE2008-66009, International Mechanical Engineers Conference and Exposition.
61. “Mixing in Large Scale Tanks, III, Predicting Slurry Pump Performance”, Leishear, Lee, Dimenna, Stefanko, 2004, Joint Heat Transfer and Fluids Engineering Conference.
62. “Mixing in Large Scale Tanks, II, Full Scale Pump Testing”, Stefanko, Leishear, Lee, Dimenna, 2004, Joint Heat Transfer and Fluids Engineering Conference.
63. “Mixing in Large Scale Tanks, I, Flow Modeling of Turbulent Mixing Jets”, Lee, Dimenna, Stefanko, Leishear, 2004, Joint Heat Transfer and Fluids Engineering Conference.

Pump Design, Applications, and Failure Analysis

64. "Vibrations Resonate into Pump and Machinery Failures", R. Leishear, 2018, Empowering Pumps eMagazine.

65. "Challenges with Positive Displacement and Centrifugal Pumps - Plenary Speaker", Leishear, 2017, Hydraulic Institute Conference.

66. “Design and Application of Low Flow Steam Siphon Jet Pumps”, Leishear, Cooper, Bennett, 2016, ASME Fluids and Heat Transfer Conference, New York, New York.
67. “Centrifugal Pump Failures Due to Resonance”, Leishear, 2010, Vibration Institute Conference.
68. “Excitation of Structural Resonance Due to a Bearing Failure”, Leishear, R. A., Stefanko, D. B.,  Newton, J. D., IMECE2007-41055, 2007, ASME International Mechanical Engineering Congress and Exposition.
69. “Pump Designs for Mixing Nuclear Waste”, 2004, R. A. Leishear, Environmental Management Technology Exchange, Savannah River Site, S. C.
70. “Relationship Between Vibrations and Mechanical Seal Life in Centrifugal Pumps”, Leishear, R. A., Stefanko, D. B., Badger, R. L., IJTC2007-44017, 2007, ASME Tribology Conference.
71. “Relationship Between Vibrations and Mechanical Seal Failures in Centrifugal Pumps”, Leishear and Stefanko, 2005, International Mechanical Engineering Congress and Exposition.
72. “Practical Use of Rotordynamic Analysis to Correct a Vertical Long Shaft Pump's Whirl Problem”, 2002, Corbo, Stefanko, Leishear, International Pump Users Symposium, Texas A&M.
73. “Predicting Slurry Pump Performance”, 2008, R. A. Leishear, Department of Energy, Slurry Retrieval, Pipeline Transport & Plugging, And Mixing Workshop.
74. “Blending and Transfer Pump Models”, 2010, R. A. Leishear, K. Parkinson, Environmental Management Technology Exchange, Atlanta, Ga.
75. "Blending Study for SRR Salt Disposition Integration: Tank 50H Scale-Modeling and Computer-Modeling for Blending Pump Design, Phase 2", 
R. A. Leishear, M. R. Poirier, M.D. Fowley, SRNL-STI-2011-00151, Savannah River National Laboratory, Aiken, S. C., Department of Energy, Office of Scientific and Technical Information.


Vibration Analysis and Shock Waves

76. "Shock Waves, Vibrations, and Resonance in Linearly Elastic Beams", 2017, R. A. Leishear,  ASME Pressure Vessel and Piping Conference.
77. “Shock Waves and Vibrations”, Leishear, R. A., 2016, ASME Pressure Vessel and Piping Conference, New York, New York.
78. “Higher Mode Frequency Effects on Machinery Vibration”, Leishear, R. A., ASME, 2010, US National Congress on Theoretical and Applied Mechanics, New York, New York.
79. “Machinery Resonance and Drilling”, 2010, Leishear, R. A., Fowley, M. D., US National Congress of Theoretical and Applied Mechanics, State College, Pa.
80. “Stresses During Impacts on Horizontal Rods”, Leishear, 2005, International Mechanical Engineering Conference and Exposition.
81. “Dynamic Stresses During Structural Impacts”, 2003, Leishear, Morehouse, 2003, International Mechanical Engineering Congress and Exposition.


Chemical Processing

82. “Nitrate Conversion of HB-Line Reillex HPQ Resin”, 2012, Steimke, Leishear, Williams, and Steeper, SRNL-STI-2012-00160, Savannah River National Laboratory, Aiken, S. C., Department of Energy, Office of Scientific and Technical Information.
81. “Grout Hopper Mock-up Testing”, 2011, Hansen, Pickenheim, Leishear, and Reigel, SRNL-STI-2011-00465, Savannah River National Laboratory, Aiken, S. C., Department of Energy, Office of Scientific and Technical Information.

Robotics

83. “Tank 18 and Tank 19 Wall Sampler Performance”, Leishear, Fowley, Thaxton, Vetsch, Martin, Steeper, France, Minichan, and Corbett, 2010, Paper No. 10368, Waste Management Symposium.

Vacuum Technology

84. “High Vacuum Measurements and Calibrations: Molecular Flow Fluid Transient Effects”, Leishear and Gavalas, 2015, Vacuum Journal, Elsevier Press, Amsterdam, Netherlands.


Numerous additional technical calculations and reports were also written to summarize Savannah River Site, DOE, research and design projects.