Pump. Handbook. EDITED BY. Igor J. Karassik. Joseph P. Messina. Paul Cooper. Charles C. Heald. THIRD EDITION. McGRAW-HILL. New York San Francisco. Pump Handbook, Fourth Edition. by: Igor J. Karassik, Joseph P. Messina, Paul Cooper, Charles C. Heald. Abstract: The classic pump handbook updated. MCGRAW HILL PUMP HANDBOOK 4TH EDITION PDF. Save As PDF Ebook mcgraw hill pump handbook 4th edition today. And You can Read Online mcgraw.
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When measured with a barometer it is called Barometric Pressure. Standard Atmospheric Pressure is the pressure at sea level and zero degrees centigrade that is balanced by a column of mercury 76 cm high. Absolute Pressure: Pabsis the sum of atmospheric pressure plus gauge pressure.
Gauge Pressure: pg is the pressure read by any instrument which has the atmospheric pressure acting in opposition to the pressure being measured, for example, a bourdon gauge. Vapour Pressure: pv is that absolute pressure of a fluid at which it is in equilibrium, at a certain temperature. Any reduction in pressure or increase in temperature of the fluid will cause evaporation until a new state of equilibrium is reached due to the space above the liquid becoming saturated with the vapour.
See Figure 1.
In the presence of a liquid and a confined space above that liquid, the molecules of the liquid will evaporate until an equilibrium point is reached. At this point, the number of molecules leaving the liquid and the number returning will be equal. This maximum vapour pressure of the liquid is the saturated vapour pressure.
It is unaffected by the presence of other gases.
This volatility must be taken into consideration on the suction side ofpumps where acceleration however localized can cause cavitation. Vacuum or Vacuum Pressure refers to pressures below atmospheric pressure and can be given in absolute pressure a positive number , or gauge pressure a negative number , or vacuum pressure an absolute number that must be subtracted from atmospheric pressure to get absolute pressure. It is a measure of the energy content of the liquid at the bottom of the column referred to datum.
Head has an advantage in pumping systems over pressure in that the differential pumping head can be measured directly with no knowledge of the liquid. See Figures 1. Elevation Head: z is the vertical distance of the point of measurement from datum.
Total Suction Head: hs is the sum of the gauge, velocity and elevation heads at the suction datum elevation plane. It is equal to the difference between the Total Discharge Head and the Total Suction Head Cavitation: is defined from a fluid mechanics perspective as the formation and collapse of vapour filled cavities in a liquid due to dynamic action.
He is the author of several papers on the practical aspects of pump mainte- nance, and a specialist in helping companies An increase in friction head can reduce their pump maintenance costs. This will give the system curve a new slope. Both sets of events produce the same result: a reduction of flow through the system.
If the flow is redirected to a different location such as in a tank farm , it means that the pump is now operating on an entirely new system which will have a completely different curve.
Thus, it is clear that regardless of the rated capacity of the centrifugal pump, it will only provide what the system requires. It is important to understand the conditions under which system changes occur, the acceptability of the new operating point on the pump curve, and the manner in which it can be moved.
LAHR C avitation is the formation involves both the net positive suction friction in the suction pipe is a and collapse of vapor bub- heads available in the system common negative component of bles in a liquid.
Figure 2 illus- pump is to be mounted. Karassik held senior positions at the Worthington Pump and Machinery Corporation.
Paul Cooper served as director of research and development for Ingersoll-Rand Research. Charles Heald is former chief engineer and manager of engineering with Ingersoll-Dresser Pump Company.
Joseph P. Messina also one of the original editors, has spent his entire career in the pump industry, and his past contributions on pump and systems engineering continue to be presented in their entirety in this edition. He assisted in updating the Hydraulic Institute Standards and taught centrifugal pump courses. He has been a contributor to the technical journals and holds pump-related patents.
Paul Cooper has been involved in the pump industry for nearly 50 years. He began by specializing in the hydraulic design of centrifugal pumps and inducers for aerospace applications at TRW Inc.