Browsing by Author "Cicatelli, Giancarlo"

Now showing 1 - 16 of 16
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    Centrifugal Pump Operation, Maintenance, Reliability, and Troubleshooting (Including Sealing Systems)
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2015) Rahimi, Ahmed; Cicatelli, Giancarlo; Kanno, Hideki; Al-Shuhail, Yousuf; Shaw, Patrick
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    Condition Monitoring Systems and Vibrations
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2015) Cicatelli, Giancarlo; Al-Aidarous, Mamdouh; Sudardjat, Isham; Mekawey, Sherief; Babar, Imran
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    Enhancement of Pump/Plant Performance by Correct Evaluation of Process Fluid Viscosity Variations and Pump Geometry
    (Turbomachinery Laboratories, Texas A&M Engineering Experiment Station, 2016) Cicatelli, Giancarlo; Schiavello, Bruno
    Case Study 16: In the modern pump industry, processed fluids are characterized by a wide spectrum of viscosity values. An unpredicted variation of actual process fluid properties, including viscosity, may lead to unexpected pump performance alteration. Also manufacturing deviations from expected internal pump geometry may cause pump performance deterioration. Both causes may determine undesired limitations of the pump operating range and plant production loss. The present Case Study illustrates a real case story of incorrect evaluation of the process fluid viscosity and pump geometry deviations, both determining performance deteriorations, described through a detailed evaluation of the internal pump losses. From the presentation of a real case, this case study highlights the importance of both the correct evaluation of viscous effects and the internal pump geometry through the application of existing loss correlations.
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    Fast and Ultimate Vibration Field Solution: From Problem Detection to Field Performance Validation
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2022) Cicatelli, Giancarlo; Schiavello, Bruno
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    Fast and Ultimate Vibration Field Solution: From Problem Detection to Field Performance Validation
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2011) Cicatelli, Giancarlo; Schiavello, Bruno
    Summary: The case. Initial analysis. Root cause analysis. Solution implementation. Results. Conclusions.
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    Fast And Ultimate Vibration Field Solution: From Problem Detection To Field Performance Validation
    (Texas A&M University. Turbomachinery Laboratories, 2010) Cicatelli, Giancarlo; Panceri, G.; Scotti, A.; Schiavello, Bruno; International Pump Users Symposium (26th : 2010)
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    Improvement of Pump/Plant Performance by Sound Evaluation of Both Process Fluid Viscosity Change and Pump Internal Leakage
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2022) Cicatelli, Giancarlo; Schiavello, Bruno
    In the modern pump industry, processed fluids are characterized by a wide spectrum of viscosity values. An unpredicted variation of actual process fluid properties, including viscosity, may lead to unexpected pump performance alteration. Also manufacturing deviations from expected internal pump geometry may cause pump performance deterioration Both causes may determine undesired limitations of the pump operating range and plant production loss.The present Case Study illustrates a real case story of incorrect evaluation of the process fluid viscosity and pump geometry deviations, both determining performance deteriorations, described through a detailed evaluation of the internal pump losses. From the presentation of a real case, this case study highlights the importance of both the correct evaluation of viscous effects and the internal pump geometry through the application of existing loss correlations.
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    Interaction Between Rotodynamic Pump Behaviour And Wear Surface Coating Technology: A MULTISTAGE PUMP CASE ANALYSIS
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2022) Viviani, Giorgia Valeria; Cicatelli, Giancarlo
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    METS2 Discussion Group 1
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2013) Rahimi, Ahmed; Cicatelli, Giancarlo; Kanno, Hideki; Alodan, Nabeel; Shaw, Patrick
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    P11 - Cavitation/NPSH (Field Problems)�
    (Turbomachinery Laboratory, [2019]) Viser, Frank; Schiavello, Bruno; Korkowski, Frank; Henry, David; Annese, Francesco; Curtin, Gre; Atkins, Ken; Green, Patrick; Adams, Ron; Cicatelli, Giancarlo
    Unexpected cavitation erosion Key parameters to consider for Root Cause Analysis when experiencing cavitation damage NPSHR, NPSHA, NPSH margin Performance loss due to insufficient NPSHA (margin) NPSH 40,000 hours Cavitation erosion rate and impeller life assessment Impact of dissolved and/or entrained gas Pumping hot water or hydrocarbons Reliability of operating with low NPSHA on hydrocarbons High cavitation-resistant materials Common types of pump cavitation, including: sheet cavitation, suction recirculation induced vortex cavitation, corner (vortex) cavitation, and tip vortex cavitation Suction specific speed Field cases (suggested by audience) : Quick fix and ultimate solution
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    Use of High-Frequency Vibration Measurements and Analysis to Identify Rotor Rubbing Patterns in Multistage Pumps
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2023) Viviani, Giorgia Valeria; Cicatelli, Giancarlo
    This paper deals with the case of an industrial multistage pump with non-classically stiff rotor.
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    Use of High-Frequency Vibration Measurements and Analysis to Identify Rotor Rubbing Patterns in Multistage Pumps
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2023) Viviani, Giorgia Valeria; Cicatelli, Giancarlo
    This paper deals with the case of an industrial multistage pump with non-classically stiff rotor.
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    Use of High-Frequency Vibration Measurements and Analysis to Identify Rotor Rubbing Patterns in Multistage Pumps
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2023) Viviani, Giorgia Valeria; Cicatelli, Giancarlo
    This paper deals with the case of an industrial multistage pump with non-classically stiff rotor.
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    Vibration Field Problem Resolved with Analytical Diagnostic Approach and Innovative Impeller Design
    (Turbomachinery Laboratories, Texas A&M Engineering Experiment Station, 2016) Schiavello, Bruno; Cicatelli, Giancarlo
    Case Study 20: Several pumps of same design exhibited field vibrations above API limits, dominated by Vane Passage Frequency (VPF). Root cause analysis included both experimental and theoretical paths. Experimental investigation, with shop vibration tests and modal analysis, showed natural frequency of bearing housings at VPF. The theoretical approach, based on mainly hydraulic analysis, pointed out to discharge recirculation as primary cause of hydraulic excitation for high VPF vibrations. The solution was identified with the design of an innovative impeller geometry (5+9 vanes). Shop tests confirmed both overall performance and drastic reduction of vibrations below API limits. Pumps with the innovative impeller were installed in the field confirming reduction of vibrations. Lesson learned: high number of vanes at impeller outlet is a key feature for controlling hydraulic excitation forces, changing both VPF and amplitude.
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    Vibration Field Problem Resolved With Analytical Diagnostic Approach And Innovative Impeller Design
    (Texas A&M University. Turbomachinery Laboratories, 2007) Schiavello, Bruno; Cicatelli, Giancarlo; International Pump Users Symposium (23rd : 2007)
    Several pump units of the same design installed in various locations is the USA with different duties exhibited high vibrations above API limits with process fluids (SG - 0.5 to 0.6) from rated point down to minimum continuous flow. The investigation for root cause was conducted along two parallel paths: experimental and theoretical. On the experimental side a series of shop vibration tests and modal analysis was carried out at full operational speed and cold water (SG 1.0). These tests included: pump as installed and two modifications of the bearing housings. With the theoretical approach several computer codes of hydraulic analysis were used for analytical diagnosis in order to identify the internal hydraulic phenomena inducing the vibrations. Unsteady hydraulic forces, very likely associated with impeller discharge recirculation, were eventually considered to produce the hydraulic excitation for high vibrations. The strategy for the ultimate solution was based on a new hydraulic design impeller with innovative geometry, i.e., two blade rows with five vanes at inlet and nine vanes at outlet. Shop tests at full operational speed confirmed both the expected pump curve and presented vibrations levels (overall and vane pass) drastically reduced below API limits in the whole operating range, from rated flow down to minimum continuous flow the new impeller was installed in all sites keeping the existing bearing housings. Field vibration data with the new impeller were collected at different times in a one year period and are compared with data produced by the old impeller. The field vibration levels with the new innovative impeller have been drastically reduced for both the overall amplitude and at vane pass frequency. The key hydraulic design parameter appears to be a high number of vanes at the impeller outlet.
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    Vibration Field Problem Resolved with Analytical Diagnostic Approach and Innovative Impeller Design
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2022) Cicatelli, Giancarlo; Schiavello, Bruno
    Several pumps of same design exhibited field vibrations above API limits, dominated by Vane Passage Frequency (VPF). Root cause analysis included both experimental and theoretical paths.Experimental investigation , with shop vibration tests and modal analysis, showed natural frequency of bearing housings at VPF. The theoretical approach , based on mainly hydraulic analysis, pointed out to discharge recirculation as primary cause of hydraulic excitation for high VPF vibrations.The solution was identified with the design of an innovative impeller geometry (5+9 vanes). Shop tests confirmed both overall performance and drastic reduction of vibrations below API limits .Pumps with the innovative impeller were installed in the field confirming reduction of vibrations.Lesson learned: high number of vanes at impeller outlet is a key feature for controlling hydraulic excitation forces, changing both VPF and amplitude.