scholarly journals Data Acquisition Prototype Chamber of Mechanical Seals Test Plant API-682 Using NI MY-RIO

SinkrOn ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 39
Author(s):  
Adhitya Sumardi ◽  
Noval Lilansa ◽  
Afaf Fadhil Rifai ◽  
Fachri Iman ◽  
M. Nursyam ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Data Acquisition ◽  
Study Data ◽  
Average Error ◽  
Test Plant ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Chamber Volume ◽  
Relationship Of ◽  
Seal Chamber

— Seal Chamber in Mechanical Seal Test Plant is a part that is used for heat exchange between hot liquid fluid in the form of condensed steam and cold liquid fluid in mechanical seal test plant. In heat exchange it is arranged so that the hot fluid can raise and lower the temperature from 20 ℃ to 80 ℃ and vice versa within 1-2 minutes. In the exchange of heat, data acquisition is still needed, which is then processed by data acquisition software that has been calibrated to determine the sensor response to the environment for test plant. In this study, data acquisition and monitoring systems were carried out and multi tasking synchronization with several sensors with one centralized controller. In addition, the volume seal chamber is equipped with a valve regulated by a servo motor to regulate the amount of hot liquid fluid in the form of condensed steam. Valve is used to be a regulator of the flow of hot fluid that enters and exits the seal chamber volume model. This research will be used to control the level and temperature in prototype of the Mechanical Sil test plant according to API 682. The manual control is done and there is an average error for the relationship of the actual valve with the water flow sensor of 8.42%.

The Study of Mechanical Seal Leakage Detection System

2013 ◽  
Vol 387 ◽  
pp. 296-300
Author(s):  
Ze Gang Sun ◽  
Chang Niu Yang ◽  
Lei Chen
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Detection System ◽  
Fluid Pressure ◽  
Mechanical Seal ◽  
Leakage Detection ◽  
Mechanical Seals ◽  
Test Platform ◽  
Data Acquisition And Processing ◽  
Design And Testing

The mechanical seal bench is the test platform for the leakage of the mechanical seal.The mechanical sealing leaking are closely related to the fluid pressure and temperature.The control system of the fluid pressure and temperature be designed to meet the needs of mechanical seals working in defferent conditions and the system of the leakage data acquisition and processing are designed based on C51 and C++BUILDER. The data collected be output on curve fitting.The test stand is certain guiding significance for the design and testing of the mechanical seal.

Analysis of the Pressure and Carrying Capacity of the Friction Pair Fluid-Film for the High Parameter Bellows Mechanical Seal

2012 ◽  
Vol 522 ◽  
pp. 441-446
Author(s):  
Qiang Gao ◽  
Mutellip Ahmat ◽  
Li Chao Ren ◽  
Jing Luo
Keyword(s):  
Carrying Capacity ◽  
High Speed ◽  
Friction Pair ◽  
Scientific Basis ◽  
Fluid Film ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Numerical Theory ◽  
Sealing Ring ◽  
Relationship Of

In this research, by based on the computational fluid dynamics (CFD) numerical theory, using the Standard-Turbulence model and the Standard-Wall function, the fluid-film between the clearance of the sealing ring friction pair for the bellows mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions was numerically simulated, the pressure fluid and the relationship of the carrying-capacity of the fluid-film between the pressure inlet of seal cavity and the width of the fluid-film, and the results of the numerical analysis was compared with the theoretical value. The researching results provide the scientific basis for the optimization designing of the high parameter bellows mechanical seals.

Research on Conjugate Heat Transfer in Mechanical Seals of the Aircraft Engine

2012 ◽  
Vol 271-272 ◽  
pp. 1093-1099
Author(s):  
Jian Ke Li ◽  
Rong Mo ◽  
Hai Cheng Yang ◽  
Zeng Qiang Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Conjugate Heat Transfer ◽  
Aircraft Engine ◽  
Mechanical Seal ◽  
Seal Ring ◽  
Mechanical Seals ◽  
Flow Quantity ◽  
Flush Fluid ◽  
Seal Chamber

According to the mechanical seals’ characters of the aircraft engine: no special flush fluid equipment and the limited space etc, a numerical model of conjugate heat transfer between seal rings and seal chamber is presented. And the flow channel and the flow quantity in the mechanical seal are studied, which will affect the heat transfer between the surface of the seal ring and the flush fluid. At last, the studied results are validated by the test.

Research on Feature Extraction Method Based on Rub-Impact Acoustic Emission Signals of Mechanical Seal End Faces

2010 ◽  
Vol 36 ◽  
pp. 68-74
Author(s):  
Chuan Jun Liao ◽  
Shuang Fu Suo ◽  
Wei Feng Huang
Keyword(s):  
Acoustic Emission ◽  
Feature Extraction ◽  
Extraction Methods ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Feature Extraction Method ◽  
Different Types ◽  
Ae Signal ◽  
Feature Information ◽  
Ae Signals

Acoustic emission (AE) techniques are put forward to monitor rub-impacts between rotating rings and stationary rings of mechanical seals by this paper. By analyzing feature extraction methods of the typical rub-impact AE signal, the method combining of wavelet scalogram and power spectrum is found useful, and can used to attribute the feature information implicated in rub-impact AE signals of mechanical seal end faces. Both simulations and experimental research prove that the method is effective, and are used successfully to identify the typical features of different types of rub-impacts of mechanical seal end faces.

scholarly journals Nurse Staffing and Coronavirus Infections in California Nursing Homes

2020 ◽  
Vol 21 (3) ◽  
pp. 174-186 ◽  
Author(s):  
Charlene Harrington ◽  
Leslie Ross ◽  
Susan Chapman ◽  
Elizabeth Halifax ◽  
Bruce Spurlock ◽  
...  
Keyword(s):  
Los Angeles ◽  
Nursing Homes ◽  
Nursing Home Residents ◽  
Nurse Staffing ◽  
The United States ◽  
Study Data ◽  
Chronic Illnesses ◽  
Staffing Levels ◽  
Control Procedures ◽  
Relationship Of

In the United States, 1.4 million nursing home residents have been severely impacted by the COVID-19 pandemic with at least 25,923 resident and 449 staff deaths reported from the virus by June 1, 2020. The majority of residents have chronic illnesses and conditions and are vulnerable to infections and many share rooms and have congregate meals. There was evidence of inadequate registered nurse (RN) staffing levels and infection control procedures in many nursing homes prior to the outbreak of the virus. The aim of this study was to examine the relationship of nurse staffing in California nursing homes and compare homes with and without COVID-19 residents. Study data were from both the California and Los Angeles Departments of Public Health and as well as news organizations on nursing homes reporting COVID-19 infections between March and May 4, 2020. Results indicate that nursing homes with total RN staffing levels under the recommended minimum standard (0.75 hours per resident day) had a two times greater probability of having COVID-19 resident infections. Nursing homes with lower Medicare five-star ratings on total nurse and RN staffing levels (adjusted for acuity), higher total health deficiencies, and more beds had a higher probability of having COVID-19 residents. Nursing homes with low RN and total staffing levels appear to leave residents vulnerable to COVID-19 infections. Establishing minimum staffing standards at the federal and state levels could prevent this in the future.

scholarly journals Migraine progression in subgroups of migraine based on comorbidities

Neurology ◽  
2019 ◽  
Vol 93 (24) ◽  
pp. e2224-e2236 ◽  
Author(s):  
Richard B. Lipton ◽  
Kristina M. Fanning ◽  
Dawn C. Buse ◽  
Vincent T. Martin ◽  
Lee B. Hohaia ◽  
...  
Keyword(s):  
Chronic Migraine ◽  
Episodic Migraine ◽  
Study Data ◽  
Continuous Variables ◽  
Web Based ◽  
Symptom Severity Scale ◽  
Hazard Ratios ◽  
Cutaneous Allodynia ◽  
Risk Of Progression ◽  
Relationship Of

ObjectiveTo test the hypothesis that statistically defined subgroups of migraine (based on constellations of comorbidities and concomitant conditions; henceforth comorbidities), previously identified using Chronic Migraine Epidemiology and Outcomes (CaMEO) Study data, differ in prognosis, as measured by rates of progression from episodic migraine (EM) to chronic migraine (CM).MethodsThe onset of CM was assessed up to 4 times over 12 months in individuals with EM and ≥1 comorbidity at baseline, based on constellations of comorbidities (comorbidity classes). The “fewest comorbidities” class served as reference. Individuals completing ≥1 follow-up survey from the web-based CaMEO Study were included. Covariates included sociodemographic variables and headache characteristics. Sex, income, cutaneous allodynia, and medication overuse were modeled as binary variables; age, body mass index, headache-related disability (Migraine Disability Assessment [MIDAS]), and Migraine Symptom Severity Scale as continuous variables. CM onset was assessed using discrete time analysis.ResultsIn the final sociodemographic model, all comorbidity classes had significantly elevated hazard ratios (HRs) for risk of progression to CM from EM, relative to fewest comorbidities. HRs for CM onset ranged from 5.34 (95% confidence interval [CI] 3.89–7.33; p ≤ 0.001) for most comorbidities to 1.53 (95% CI 1.17–2.01; p < 0.05) for the respiratory class. After adjusting for headache covariates independently, each comorbidity class significantly predicted CM onset, although HRs were attenuated.ConclusionsSubgroups of migraine identified by comorbidity classes at cross-section predicted progression from EM (with ≥1 comorbidity at baseline) to CM. The relationship of comorbidity group to CM onset remained after adjusting for indicators of migraine severity, such as MIDAS.Clinicaltrials.gov identifierNCT01648530.

Based on LabVIEW Three-Stage Current Computer Protection Experimental System

2015 ◽  
Vol 734 ◽  
pp. 732-735
Author(s):  
You Wen Tian ◽  
Hua Song Zhao
Keyword(s):  
Data Acquisition ◽  
Fault Simulation ◽  
Experimental System ◽  
Simulation Software ◽  
Loop Structure ◽  
Logical Relationship ◽  
Teaching Platform ◽  
Data Acquisition Module ◽  
Relationship Of ◽  
Microcomputer Protection

Current microcomputer protection experimental system is created based on LabVIEW. Each module was created based on the modular thinking (data acquisition module, start module, algorithm module). Functions of microcomputer protection were implemented. Fault data was generated by fault simulation software MATLAB. LabVIEW controls and loop structure achieved simulating a variety of action logical relationship of computer protection. This system had many advantages, such as visibility, controllability, authenticity and flexibility. The system was able to verify the performance of computer protection at different fault. The system was also able to analyze the situation of computer protection maloperation and misoperation, thus it further provided teaching platform for the three section current microcomputer protection experiment.

Analysis of Carrying Capacity and Friction Torque of Friction Pair Fluid-Film for High Parameter Bellows Mechanical Seal

2013 ◽  
Vol 455 ◽  
pp. 207-211
Author(s):  
Mutellip Ahmat ◽  
Zhi Wei Niu ◽  
Guzaiayi Abudoumijiti
Keyword(s):  
Carrying Capacity ◽  
High Speed ◽  
Influence Factor ◽  
Friction Pair ◽  
Scientific Basis ◽  
Friction Torque ◽  
Fluid Film ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
The Relationship

The friction pair for bellows mechanical seal as a friction element is one of the key components for it. In this research, by based on the computational fluid dynamics (CFD) numerical theory, using the Fluent software, corresponding model and parameters, the fluid-film between the clearance of the sealing ring friction pair for the bellows mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions is numerically simulated, the relationship between the carrying-capacity of the fluid-film and the temperature, the viscosity of the fluid-film, the relationship between friction torque of the fluid-film and the speed, viscosity of the fluid-film, the influence factor of leakage are obtained. The researching results provide the scientific basis for the optimization designing of the high parameter bellows mechanical seals.

Optimum Design of Flat End Face Mechanical Seal Based on Coupling Analysis

2010 ◽  
Vol 37-38 ◽  
pp. 819-822 ◽  
Author(s):  
Jian Feng Zhou ◽  
Bo Qin Gu ◽  
Chun Lei Shao
Keyword(s):  
Optimum Design ◽  
Thermal Deformation ◽  
Coupling Effect ◽  
Design Method ◽  
Fluid Film ◽  
Outer Side ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Friction Heat ◽  
Bearing Force

The flat end face mechanical seals are widely used in shaft sealing at moderate rotational speed. The thermal deformation of the rotating and stationary rings initiated by friction heat of fluid film should be primarily considered in the design of mechanical seal. In consideration of the coupling effect among the thermal deformation of sealing rings, the fluid flow in the gap composed by end faces of sealing rings and the heat transfer from fluid film to sealing rings, the optimum design method for flat end face mechanical seal is established. The end faces are fabricated to form a divergent gap at the inner side of the sealing rings, and a convergent gap will occur at the outer side and a parallel gap will be obtained at where the original divergent gap is due to the thermal deformation. After optimization, the leakage rate can be reduced while the bearing force of fluid film is still large enough to keep the fluid lubrication of the end faces.

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