By American Institute of Chemical Engineers (AIChE)
ISBN-10: 0470180978
ISBN-13: 9780470180976
Optimistic Displacement Pumps is a present reference consultant for confident displacement pumps for either conventional and cutting-edge checking out equipment, and serves as a bridge among textbooks and manufacturer's literature by means of offering gear trying out practices in line with technical information, functional adventure, and educational idea. With its basic, functional concentration, this e-book not just is a source consultant to any engineer's job, but in addition provides very important details to the final literature of pump basics and working reliability: Written for box clients, and terminology concisely outlined. A mentoring consultant highlighting parts for troubleshooting problem-solving whilst functionality standards usually are not met. Produced with consensus and passed through an analogous rigorous technical evaluation approach as different ETPC tactics.
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Extra resources for Positive Displacement Pumps: A Guide to Performance Evaluation (AIChE Equipment Testing Procedure)
Sample text
1 Shaft Speed There are many types of tachometers that can be used on either the pump or motor shaft, as long as a device connects the two shafts and maintains a constant speed ratio between them. If a device, such as an eddy current drive, is used that varies the speed ratio between the shafts, the tachometer must be used only on the pump shaft. The tachometer should be accurate to within 2% at the test speeds. A small change in speed can make a large difference in the performance of a large, low-speed pump.
During this test, shaft speed, discharge pressure, and liquid viscosity are held constant. Input power does not change too much, and it is usually not measured for this test. illlin> Figure 14: Minimum suction pressure test set-up Operate the pump with both throttling valves open, and record the values of all of the variables. Start slowly, closing the suction sidethrottling valve until the suction pressure drops 2 psi below its previous value. Record the values of all the variables again. Repeat this process using increments of 2 psi in the suction pressure until the pump's flow has dropped to 90% of what it was at the beginning of 21 AlChE Equipment Testing Procedure the test.
O n a larger VFD it is possible to record the current and voltage into the drive and obtain reasonably accurate power values using the appropriate formulae. On smaller drives (approximately 10 HP and smaller), the accuracy of obtaining readings this way is questionable, and the drive manufacturer should be consulted. 0 Tests The following tests are generally applicable to progressive cavity pumps as long as certain characteristics of this type of pump are recognized. One is that the performance of progressive cavity pumps is affected by fluid temperature.
Positive Displacement Pumps: A Guide to Performance Evaluation (AIChE Equipment Testing Procedure) by American Institute of Chemical Engineers (AIChE)
by Joseph
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