A case study on elimination of premature failure source from manufacture of fluoroelastomer inflatable seals for sodium cooled fast reactor towards sustainability

2022 ◽  
pp. 106039
Author(s):  
N.K. Sinha ◽  
S. Chattopadhyay
Keyword(s):  
Fast Reactor ◽  
Premature Failure

Exit Geometry Modifications of Double Volute Centrifugal Pump for Vane Passing Frequency Vibration Resolution: A Case Study

2016 ◽  
Vol 16 ◽  
pp. 82-90
Author(s):  
M. Dasuki Yusoff ◽  
Meng Hee Lim ◽  
M. Rabai Yahaya ◽  
Jamaludin Azman
Keyword(s):  
Centrifugal Pump ◽  
Leading Edge ◽  
Site Investigation ◽  
High Energy ◽  
Flow Induced Vibration ◽  
Premature Failure ◽  
Main Indicator ◽  
Recovery Cost ◽  
Reliability Issue

Reliability of centrifugal pump is considered as a main indicator to measure the capability of the pump in performing its operating envelop delivery without any premature failure. Flow induced vibration namely vane passing pressure pulsation is inherent when interaction between impeller vane wakes passes the casing volute leading edge. However, excessive excitation of hydraulic pulsation might expense the pump integrity in term of unsatisfactory unit availability, frequent equipment breakdown and high maintenance recovery cost. This paper shares a case study experienced by the authors in resolving a long outstanding reliability issue for a high energy double volute centrifugal pump through combination of rotating-stationary exit geometry modification towards an acceptable hydraulic pulsation and stable operating pump. This paper also highlights the balanced approach on the site investigation, root cause analysis and practical remedial action through industrial experiential knowledge.

scholarly journals Quality Assessment of Milling Pavement Surface Using 3D Line Laser Technology

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Bing Hui ◽  
Mu Guo ◽  
Xiaofang Liu
Keyword(s):  
Laser Scanning ◽  
Three Dimensional ◽  
Poor Quality ◽  
Surface Model ◽  
Premature Failure ◽  
Quality Work ◽  
Milled Surface ◽  
Surface Assessment

To ensure that a regular milled surface texture provides good bonding without residual distress, a new specification of milling surface assessment has been established for quantitatively evaluating the milled surface quality. This research explores the possibility of using three-dimensional (3D) laser scanning technology to develop an algorithm to obtain a milled surface model that can measure evaluating indicators, milling depth and texture depth, and identify poorly milled areas. A case study was conducted by using a laser scanning vehicular system to collect 3D continuous pavement transverse profiles data in a 500 m long segment of Highway S107. The results show that the proposed method is very promising and can measure the milling depth and texture depth to effectively and quantitatively differentiate between good- (milling depth between 47 mm and 53 mm and texture depth exceeding 2 mm) and poor-quality work. Moreover, the poorly milled areas such as those with residual distress and unmilled areas that will lead to premature failure can also be identified using the proposed method. The proposed method can effectively support remilling work and ensure the quality of the overlay pavement.

Investigation of Premature Failure of an Industrial Combustor: A Case Study

2021 ◽  
Author(s):  
Gustavo Gomes Sampaio Cursino ◽  
Antonio Tavernard Pereira Neto ◽  
Antonio Carlos Brandao de Araujo ◽  
José Jailson Nicácio Alves
Keyword(s):  
Premature Failure

A Case Study on the Premature Failure of a Cooling Water Pump Shaft

2008 ◽  
Vol 9 (1-2) ◽  
pp. 99-106
Author(s):  
H. Roy, ◽  
D. Ghosh, ◽  
A.C. Pankaj, ◽  
A.K. Shukla, ◽  
J. Basu,
Keyword(s):  
Cooling Water ◽  
Water Pump ◽  
Premature Failure ◽  
Pump Shaft

Premature Failure of Submarine Well Fluid Lines: A Case Study

2020 ◽  
Author(s):  
Jeetendra Gupta ◽  
Maushmi K. Talukdar ◽  
S. K. Velusshami ◽  
Anita Sharma ◽  
Suraj Makkar
Keyword(s):  
Premature Failure

scholarly journals A Study of K- Factor Power Transformer Characteristics by Modeling Simulation

2011 ◽  
Vol 1 (5) ◽  
pp. 114-120 ◽  
Author(s):  
O. E. Gouda ◽  
G. M. Amer ◽  
W. A. A. Salem
Keyword(s):  
Power Transformer ◽  
Thermal Capacity ◽  
Power Transformers ◽  
Nonlinear Loads ◽  
Harmonic Current ◽  
Premature Failure ◽  
Modeling Simulation ◽  
Harmonic Currents ◽  
K Factor

Harmonic currents generated by nonlinear loads can cause overheating and premature failure in power transformers. K-factor transformers are specially designed to accommodate harmonic currents and offer protection against overheating caused by harmonics. They minimize harmonic current loss and have an additional thermal capacity of known limits. According to IEEE C57-110, the winding eddy current losses are considered proportional to the harmonic current squared times its harmonic number. K-factor is only an indicative value and the authors' main objective in this paper is to study the effect of harmonics on oil filled transformer and to simulate harmonic behavior using Matlab Simulink. A case study is simulated in order to investigate K-factor values with pumping loads, with and without the use of harmonic filters. Results are compared with measured values.

Tube Side Corrosion in Heat Exchangers: A Case Study

2006 ◽  
Author(s):  
Antonio Carlos Ribeiro ◽  
L. C. Dalprat-Franco
Keyword(s):  
Carbon Steel ◽  
Heat Exchangers ◽  
Premature Failure ◽  
Corrosion Pits

Tube side corrosion in heat exchangers is a major concern in the design and operation of these equipment. This paper describes a particularly serious occurrence of what was interpreted to be Microbiologically Increased Corrosion (MIC) in a carbon steel condenser that lead to premature failure of the tubes by perforated corrosion pits. The photographs in the text illustrate the problem and proposed cures are discussed in the conclusions.

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

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