Closure to “Discussion of ‘Water-Column Separation at Two Pumping Plants’” (1968, ASME J. Basic Eng., 90, p. 531)

1968 ◽  
Vol 90 (4) ◽  
pp. 531-531 ◽  
Author(s):  
R. J. Brown
Keyword(s):  
Water Column ◽  
Column Separation

A Lagrangian wave characteristic method for simulating transient water column separation

2009 ◽  
Vol 101 (6) ◽  
pp. 64-73 ◽  
Author(s):  
Bong Seog Jung ◽  
Paul F. Boulos ◽  
Don J. Wood ◽  
Christopher M. Bros
Keyword(s):  
Water Column ◽  
Characteristic Method ◽  
Wave Characteristic ◽  
Column Separation

Water-Column Separation at Two Pumping Plants

1968 ◽  
Vol 90 (4) ◽  
pp. 521-530 ◽  
Author(s):  
R. J. Brown
Keyword(s):  
Water Column ◽  
Detrimental Effect ◽  
Time History ◽  
Field Measurements ◽  
Measured Data ◽  
Operating Characteristics ◽  
Inherent Difficulty ◽  
Column Separation ◽  
History Of ◽  
Entrained Air

Results of field measurement of transients in two pump discharge lines show that the pressures were greater than had been predicted during design, and a theory and method of analysis are developed which explains the time-history of the transients measured. The field measurements were undertaken because of the complexity of the phenomena and because very little measured data were available. Results are presented graphically along with analytical solutions. Conclusions drawn were: (a) The inherent difficulty of prediction of water-column separation effects is further complicated by the uncertainty about complete pump operating characteristics and actual moment of inertia of pumps and motors; (b) the effects of air and gases entrained in solution in the water must be considered in the analytical solution; and (c) entrained air can have a detrimental effect on the water-hammer transient, i.e., larger pressure surges in the discharge line and higher reverse speeds of the pumps can be caused by its presence.

Pressure Surges Following Water-Column Separation

1961 ◽  
Vol 83 (3) ◽  
pp. 456-458 ◽  
Author(s):  
J. T. Kephart ◽  
Kenneth Davis
Keyword(s):  
Water Column ◽  
Rapid Assessment ◽  
Column Separation ◽  
Water Columns ◽  
Pressure Surge

Equations have been derived using rigid-water-column theory which permit rapid assessment of pressure surge magnitude owing to rejoinder of water columns in pump-discharge lines subsequent to a water-column separation induced by failure of power to the pump drivers. The method is valid only for systems which are equipped with check valves at the pumps.

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