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Fatigue Failure Analysis of a Centrifugal Pump Shaft [chapter]

Mohd Nasir Tamin, Mohammad Arif Hamzah
2017 Failure Analysis and Prevention  
The procedures are demonstrated in performing failure analysis of a centrifugal pump shaft.  ...  It is concluded that fatigue crack nucleated in the localized plastic zone at the threaded root region and propagated to cause the premature fatigue failure of the rotor shaft.  ...  A typical operation cycle of the centrifugal pump consists of a start-up and running of the pump at a nominal rotor speed of 2975 rpm for 14 h, with a 2-h complete shut-down interval.  ... 
doi:10.5772/intechopen.70672 fatcat:5mopjnhzubaaxe6abhgtjli274

Diagnosis of Centrifugal Pump Faults Using Vibration Methods

A Albraik, F Althobiani, F Gu, A Ball
2012 Journal of Physics, Conference Series  
Using an in-house pump system, a number of experiments have been carried out on a centrifugal pump system using five impellers: one in good condition and four others with different defects, and at different  ...  The exterior vibration responses were investigated to extract several key features to represent the healthy pump condition, pump operating condition and pump energy consumption.  ...  If vibration is also present at shut-off the blockage may be in the impeller causing a physical imbalance [17] .  ... 
doi:10.1088/1742-6596/364/1/012139 fatcat:kko3ns4trbcavgedhq5mup22uq

Using a Statistical-Numerical Procedure for the Selection of Pumps running as Turbines to be applied in Water Pipelines: Study Cases

Silvio Barbarelli, Mario Amelio, Gaetano Florio
2018 Journal of Sustainable Development of Energy, Water and Environment Systems  
Then, a one-dimensional model, starting from data available on the pumps manufacturers catalogues, reconstructs a virtual geometry of the pump running as turbine, and calculates the performances curves  ...  at 1,000 m above sea level (Calabria, South Italy).The assessment of the annual energy yield gives a confirmation of the effectiveness and convenience of using pumps running as turbines.  ...  (Pmax), head at the shut off (Hmo), impeller diameter (D2) and size of the pump (yP).  ... 
doi:10.13044/j.sdewes.d5.0181 fatcat:k7g32em7szc65dbkpamfinl6ku

Underground Pumped Storage Hydropower Case Studies in Belgium: Perspectives and Challenges

Alessandro Morabito, Jan Spriet, Elena Vagnoni, Patrick Hendrick
2020 Energies  
Moreover, a preliminary economic analysis of the underground pumped storage system and a greenhouse gas emission evaluation for the storage system's lifetime are presented.  ...  To avoid the geographical and topographical prerequisites of the conventional pumped hydro energy storage, the use of underground cavities as water reservoirs allows countries without steep topography,  ...  Furthermore, the pump start is not easier than for a ternary group.  ... 
doi:10.3390/en13154000 fatcat:6gaa2yyuabcqtmx7o77dfqjvoq

Simmondsin concentrate from defatted jojoba meal

Selim M. Erhan, Thomas P. Abbott, H. Nabetani, H. Purcell
1997 Industrial crops and products (Print)  
A water-extract of defatted jojoba meal was filtered and concentrated from 2.6 to 23% solids on a pilot scale in a reverse osmosis concentration apparatus and then freeze-dried.  ...  Permeate flux decreased with time because maximum pressure could not maintain a flux rate of 1.24 x 10 -5 mls at the higher solids concentrations.  ...  A pressure-sensi- tive sensor shuts off the system when pressure exceeds 6.4 MPa to protect the membrane.  ... 
doi:10.1016/s0926-6690(96)00215-4 fatcat:3m34wr3uh5asfhsnmpcvbtwwr4

K-Series Centrifuges I. Development of the K-II continuous-sample-flow-with-banding centrifuge system for vaccine purification

N.G. Anderson, D.A. Waters, C.E. Nunley, R.F. Gibson, R.M. Schilling, E.C. Denny, G.B. Cline, E.F. Babelay, T.E. Perardi
1969 Analytical Biochemistry  
efforts. 4 We therefore initiated development of a new group of centrifuges, desig~nated the K-series, suitable for the purification of large quantities of virus and subcellular particles.  ...  A preliminary report of this work has appeared (8).  ...  DISCUSSION A spectrum of new vaccines of high purity may now be prepared using the K-II continuous-sample-flow-with-banding centrifuge.  ... 
doi:10.1016/s0003-2697(69)80014-x pmid:5361400 fatcat:fep7x6qwincedai2tzczi4nyty

Diagnostics for Periodically Excited Actuators

Lukasz Huchel, Jan Helsen, Peter Lindahl, Steven B. Leeb
2019 IEEE Transactions on Instrumentation and Measurement  
Shut-off Valve Shut-off Valve Diaphragm Pump Pressure, Flow Transducers Non-return Valve IEPE Sensor Acquisition Circuit Non-return Valve Drain M AC Fig. 8.  ...  The pump is driven by a 0.5 HP, 4-pole induction motor. It features an internal gearbox with a 10 : 1 ratio.  ... 
doi:10.1109/tim.2019.2947971 fatcat:i3udix6hxvbxloreo6lp5ixhli

Performance of generator protection relays during off-nominal frequency operation

Dennis Tierney, Bogdan Kasztenny, Dale Finney, Derrick Haas, Bin Le
2014 2014 67th Annual Conference for Protective Relay Engineers  
This paper reviews the protection requirements for generators during periods of off-nominal frequency operation.  ...  A novel approach, which provides excellent performance for very significant frequency deviations and can accommodate multiple frequency islands, is presented.  ...  Terry Foxcroft of Snowy Hydro Limited for his valuable input.  ... 
doi:10.1109/cpre.2014.6799021 fatcat:szkzg5fnuna43dontppbxfsxom

Electrical submersible pumps manual design, operations and Maintenance

Gabor Takacs
2018 Zenodo  
Flowing production means that the pressure at the well bottom is sufficient to overcome the sum of pressure losses occurring along the flow path to the separator  ...  Usually, oil wells in the early stages of their lives flow naturally to the surface and are called flowing wells.  ...  Thrust is at a maximum at a flow rate of zero (shut-off condition) and points downward and then continuously decreases for increased liquid rates.  ... 
doi:10.5281/zenodo.5506881 fatcat:7m73gqqxmfepddyqjy7kumddta

Continuous integrated antibody precipitation with two‐stage tangential flow microfiltration enables constant mass flow

Daniel Burgstaller, Alois Jungbauer, Peter Satzer
2019 Biotechnology and Bioengineering  
The precipitate cannot be separated with centrifugation, because a highly compressed sediment results in poor resolubilization.  ...  Continuous precipitation is a new unit operation for the continuous capture of antibodies.  ...  Again, in this unit, we closed off the bleed to allow equilibration for a startup phase of 60 min. After 60 min (120 min after process start), the bleed out of stagetwo was started.  ... 
doi:10.1002/bit.26922 pmid:30636284 pmcid:PMC6667901 fatcat:4nwd5k2xufgg7nl6aqekmrqt5a

Large-scale purification of single-wall carbon nanotubes: process, product, and characterization

A.G. Rinzler, J. Liu, H. Dai, P. Nikolaev, C.B. Huffman, F.J. Rodríguez-Macías, P.J. Boul, A.H. Lu, D. Heymann, D.T. Colbert, R.S. Lee, J.E. Fischer (+3 others)
1998 Applied Physics A: Materials Science & Processing  
We describe, in detail, a readily scalable purification process capable of handling single-wall carbon nanotube (SWNT) material in large batches.  ...  These successes enable the production of gram per day quantities of highly pure SWNT, which should greatly facilitate investigation of material properties intrinsic to the nanotubes.  ...  of Energy Grant #DE-FC02-86ER45254; and (iii) at UKentucky: the Center for Applied Energy Research, and NSF Grant #OSR-94-52895.  ... 
doi:10.1007/s003390050734 fatcat:ygvrdqqysfcgvak3zpo4v6riru

A Novel Surge Damping Method for Hydraulic Transients with Operating Pump Using an Optimized Valve Control Strategy

Zheng Cao, Qi Xia, Xijian Guo, Lin Lu, Jianqiang Deng
2022 Water  
was able to achieve a 34% time margin or a maximal 75.2% surge reduction in the case of using an positive displacement pump.  ...  The results showed that the proposed nonlinear optimized control method was able to reduce surge amplitude by 9.3% and 11.4% in pipe systems with and without running centrifugal pump, respectively, and  ...  negative characteristic line C − , which is the reversal of the centrifugal pump case.  ... 
doi:10.3390/w14101576 fatcat:vcsgbgx7ljaztf52nzjpokntce

Discussion on "fields of motor application" (Rushmore), and "electricity in grain elevators" (Stafford), Deer Park, Md., June 29, 1915. (see proceedings, for June, 1915)

1915 Proceedings of the American Institute of Electrical Engineers  
Reverse for emergency conditions only. Recent developments in control equipments for use with a-c. motors incorporate all of these advantageous features.  ...  condition of starting required.  ...  However, the power used does aggregate a large amount when taken in connection with ade quate lighting of terminal areas and at least that part that goes to charge batteries is off-peak and very desirable  ... 
doi:10.1109/paiee.1915.6590689 fatcat:cxv7up4t6fglnpbjffp3jxtqui

Electricity in Grain Elevators

H. E. Stafford
1915 Transactions of the American Institute of Electrical Engineers  
OF PAPER The object of this paper is to show the storage capacitv of grain at the terminals of Port Arthur and Fort William, the rated horse power capacity of prime movers, the amount of power used to  ...  turn out a given quantitv of grain, and the power used by different machines in the process.  ...  Reverse for emergency conditions onlv. Recent developments in control equipments for use with a-c. motors incorporate all of these advantageous features.  ... 
doi:10.1109/t-aiee.1915.4765257 fatcat:yjd77rcqzbh3pjph37nvngy43y

Automatic Operation at the Broadside Filter Plant in Scotland

Eric W. Denholm
1956 Journal - American Water Works Association  
When the plant closes down as a result of a rise in the level of the clear water tank as described, the draining of the master slow-start tank also oper- ates a float switch to shut off [1] the indicator  ...  Mixing is water. water enters a steel spreader achieved by drawing water at a rate of 350 gpm from the raw-water chan- nel by centrifugal pump and returning it vertically downwards into the mix- AT BROADSIDE  ... 
doi:10.1002/j.1551-8833.1956.tb19338.x fatcat:fifh6g3o55gjzhbljq36n653ae
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