The Case for Combining Pump Maintenance and Systematic Upgrading

2008 ◽  
Author(s):  
Heinz P. Bloch ◽  
Robert Bluse ◽  
James Steiger
Keyword(s):  
System Performance ◽  
Current System ◽  
Highly Qualified ◽  
Centrifugal Pumps ◽  
Term Operation ◽  
Performance Requirements ◽  
Periodic Maintenance ◽  
Work Supports

Virtually, all industrial machinery requires periodic maintenance for dependable long-term operation. In fact, the very term “maintenance” is defined as keeping machines in the as-designed or as-purchased and manufactured condition. At issue is whether the equipment owner’s profitability objectives are best served by “maintaining only”, or by judiciously combining maintenance and upgrading tasks. Assuming the answer favors combining maintenance and upgrading, the question arises whether an intelligent and well thought-out combination of maintenance and upgrading should be entrusted only to the original equipment manufacturer (OEM), or if qualified non-OEMs should be considered also. The co-authors would like to offer their answer to the question. Experience shows that a highly qualified independent rebuild shop with demonstrated capabilities and experienced personnel can offer high-quality upgrades that improve both uptime and efficiency. Such a shop can do so consistent with current system performance requirements. With the considerable consolidations in the pump industry, the distinct possibility exists that the OEM is not able to offer the same engineering competence he previously had and that independent shops should be considered. This presentation deals with a case study and details where such upgrading was being planned, implemented, and verified to have had the desired results. It further explains the role played by competent pump rebuild shops (we chose to call them “CPRS”) in these important endeavors. Our work supports the premise that rebuilding a vintage process pump to original OEM specifications makes no sense, given current pump rebuilding technology and changes to the system performance that occur over time. We find compelling reasons to systematically upgrade the efficiency and potential run length of large centrifugal pumps. Of course, this upgrading must be pre-planned and then carried out during a future maintenance outage.

scholarly journals A Combined Approach for Model-Based PV Power Plant Failure Detection and Diagnostic

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1261
Author(s):  
Christopher Gradwohl ◽  
Vesna Dimitrievska ◽  
Federico Pittino ◽  
Wolfgang Muehleisen ◽  
András Montvay ◽  
...  
Keyword(s):  
Power Plants ◽  
Large Scale ◽  
Failure Detection ◽  
Energy Yield ◽  
Combined Approach ◽  
Levelized Cost Of Electricity ◽  
Term Operation ◽  
Model Based

Photovoltaic (PV) technology allows large-scale investments in a renewable power-generating system at a competitive levelized cost of electricity (LCOE) and with a low environmental impact. Large-scale PV installations operate in a highly competitive market environment where even small performance losses have a high impact on profit margins. Therefore, operation at maximum performance is the key for long-term profitability. This can be achieved by advanced performance monitoring and instant or gradual failure detection methodologies. We present in this paper a combined approach on model-based fault detection by means of physical and statistical models and failure diagnosis based on physics of failure. Both approaches contribute to optimized PV plant operation and maintenance based on typically available supervisory control and data acquisition (SCADA) data. The failure detection and diagnosis capabilities were demonstrated in a case study based on six years of SCADA data from a PV plant in Slovenia. In this case study, underperforming values of the inverters of the PV plant were reliably detected and possible root causes were identified. Our work has led us to conclude that the combined approach can contribute to an efficient and long-term operation of photovoltaic power plants with a maximum energy yield and can be applied to the monitoring of photovoltaic plants.

Numerical Modelling of a District Scale Groundwater Heat Pump Operation: Case Study from Colchester, UK

2021 ◽  
Author(s):  
Taha Sezer ◽  
Abubakar Kawuwa Sani ◽  
Rao Martand Singh ◽  
David P. Boon
Keyword(s):  
Large Scale ◽  
District Level ◽  
Thermal Plume ◽  
Injection Wells ◽  
Term Operation ◽  
Heating And Cooling ◽  
Groundwater Heat Pump ◽  
The Impact

<p>Groundwater heat pumps (GWHP) are an environmentally friendly and highly efficient low carbon heating technology that can benefit from low-temperature groundwater sources lying in the shallow depths to provide heating and cooling to buildings. However, the utilisation of groundwater for heating and cooling, especially in large scale (district level), can create a thermal plume around injection wells. If a plume reaches the production well this may result in a decrease in the system performance or even failure in the long-term operation. This research aims to investigate the impact of GWHP usage in district-level heating by using a numerical approach and considering a GWHP system being constructed in Colchester, UK as a case study, which will be the largest GWHP system in the UK. Transient 3D simulations have been performed pre-construction to investigate the long-term effect of injecting water at 5°C, into a chalk bedrock aquifer. Modelling suggests a thermal plume develops but does not reach the production wells after 10 years of operation. The model result can be attributed to the low hydraulic gradient, assumed lack of interconnecting fractures, and large (>500m) spacing between the production and injection wells. Model validation may be possible after a period operational monitoring.</p>

scholarly journals Rehabilitation of renders of old buildings in Portugal

2015 ◽  
Vol 33 (4/5) ◽  
pp. 337-353 ◽  
Author(s):  
Carmo Gonçalves de Carvalho ◽  
Inês Flores-Colen ◽  
Paulina Faria
Keyword(s):  
Stone Masonry ◽  
Content Type ◽  
Performance Requirements ◽  
Periodic Maintenance ◽  
Different Types ◽  
Points Of View ◽  
And Performance ◽  
Definition Of ◽  
Correct Implementation

Purpose – The purpose of this paper is to present a proposal for a methodology to support the rehabilitation project of renders of old buildings. Design/methodology/approach – To achieve the objective it was considered essential to define the main types of participants and aspects to integrate the proposal. The research methodology consists in an inquiry presented to several professional participants in rehabilitation, a market study of materials and products available in Portugal, the design of a methodology proposal and its application to a case study. The inquiry sample totals 24 answers from the targeted professionals. A sequence of relevant supporting procedures consists in the proposal, which aims to provide a supporting methodology to decide and project in this context and also to be tested with its application to the building. This proposal was applied to an old building with load-bearing stone masonry walls and air-lime-based renders. Findings – It was concluded that the assessment of the building and ex+ternal renderings’ condition, its diagnosis and of the supporting walls, the definition of intervention, the specification of materials to be used and performance requirements to comply, and also plans for conservation and periodic maintenance, are crucial. From the inquiry, compatibility between materials and complementary roles and points of view of different types of participants in rehabilitation must be highlighted. Originality/value – A proposal for a methodology to support the project could provide useful guidance particularly for architects and construction engineers, and improve the understanding of direct participants on site, therefore contributing for the correct implementation of the intervention.

scholarly journals Identifying Efficient Operating Rules for Hydropower Reservoirs Using System Dynamics Approach—A Case Study of Three Gorges Reservoir, China

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2448 ◽  
Author(s):  
Jianzhong Zhou ◽  
Benjun Jia ◽  
Xiao Chen ◽  
Hui Qin ◽  
Zhongzheng He ◽  
...  
Keyword(s):  
System Dynamics ◽  
Three Gorges Reservoir ◽  
Central China ◽  
Optimal Decision ◽  
Three Gorges ◽  
Term Operation ◽  
Operating Rules ◽  
Hydropower Reservoirs

In the long-term operation of hydropower reservoirs, operating rules have been used widely to decide reservoir operation because they can help operators make an approximately optimal decision with limited runoff information. However, the problems faced by reservoir managers is how to make and select an efficient operating rule properly. This study focuses on identifying efficient and reliable operating rules for the long-term operation of hydropower reservoirs using system dynamics (SD) approach. A stochastic hydrological model of reservoir inflow time series was established and used to generate a large number of inflow scenarios. A deterministic optimization operation model of hydropower reservoirs was constructed and then resolved using dynamic programming (DP) algorithm. Simultaneously, within implicit stochastic optimization (ISO) framework, different operating rules were derived using linear fitting methods. Finally, the most efficient one of the existing operating rules was identified based on SD simulation coupled with the operating rules. The Three Gorges Reservoir (TGR) in central China was used as a case study. The results show that the SD simulation is an efficient way to simulate a complicated reservoir system using feedback and causal loops. Moreover, it can directly and efficiently guide reservoir managers to make and identify efficient operating rules for the long-term operation of hydropower reservoirs.

A Framework for Using Dynamic Modeling to Support Lean Sustainment in a Complex Setting

2021 ◽  
pp. 91-110
Author(s):  
Marc Haddad ◽  
Rami Otayek
Keyword(s):  
Systems Thinking ◽  
System Performance ◽  
Demand Uncertainty ◽  
Integrated Approach ◽  
Dynamics Modeling ◽  
Work In Process ◽  
Simulation Results ◽  
Thinking Tools

This chapter proposes a framework for integrating lean and systems thinking tools to explore the dynamics of lean implementations in manufacturing. The value of this integrated approach is in supplementing the operational level principles of lean with the strategic outlook of systems thinking to mitigate adverse impacts of operational complexity on system performance. In particular, the focus of the framework is to enable the sustainment of lean gains in the long-term, a major challenge in manufacturing settings. The application of the framework is illustrated with a case study of a lean implementation for reducing work-in-process (WIP) at a clothing manufacturer dealing with a number of operational complexities such as demand uncertainty, a high product mix and inefficient processes. The case study highlights the usefulness of system dynamics modeling in revealing counterintuitive system behaviors that could compromise the success of the lean initiative. The simulation results demonstrate the application of the framework for sustaining lean implementations in practice.

scholarly journals Experience Obtained and Lessons Learnt from the Transition of Ukrainian NPPs to Long-Term Operation

2020 ◽  
pp. 15-29
Author(s):  
O. Shugailo ◽  
Yu. Grebenyuk ◽  
O. Zelenyі ◽  
D. Ryzhov ◽  
Ol-r Shugaylo ◽  
...  
Keyword(s):  
The State ◽  
Highly Qualified ◽  
Safety Review ◽  
Term Operation ◽  
Lessons Learnt ◽  
Periodic Safety ◽  
Scientific Potential ◽  
Unique Experience ◽  
Review Reports

Nuclear energy is a strategic Ukrainian industry that produces more than 50% of electricity at present. Over the last decade during the operation of Ukrainian NPPs, the set of technical matters have been found and corresponding tasks shall be decided with engaging of scientific potential of the country. One of such matter is a safety justification of NPP components and structures for the period that is bigger than an initial design one and that is defined as transition from design operation to the long-term operation (LTO). From the end of 2010 to the beginning of 2020, the State Nuclear Regulatory Inspectorate of Ukraine granted 11 licenses for 11 power units based on positive results of the state assessment and review of Periodic Safety Review Reports considering mandatory safety review each ten years. These results became possible due to the coordinated, conscientious and longstanding work of thousands of highly qualified nuclear experts, which led to the fact that Ukraine now has a unique experience in preparation for a transition of various types of WWER-1000 and WWER-440 reactors to LTO. The summarized results and lessons learnt from the practice of transition to LTO are presented in this paper.

Making the Case for Global Outsourcing

2019 ◽  
pp. 611-632
Author(s):  
Alan D. Smith ◽  
Sara Joy Krivacek
Keyword(s):  
Business Practices ◽  
Cultural Changes ◽  
Term Operation ◽  
Customer Expectations ◽  
Global Outsourcing ◽  
Quality Product ◽  
The Common ◽  
Best Business Practices

Social media and empowered customers have significantly raised customer expectations of quality. Although there are similarities and differences in the approaches taken by management, they share the common goal of delivering a high-quality product and satisfying their customers. The majority of the case study concentrates on how both companies monitor quality, evaluate performance, train employees, and promote continuous improvement in order to achieve best business practices. The review of the literature on global outsourcing and analysis of the case studies provide evidence that economic development creates both short-term operation advantages through increased levels of efficiency as well as long-term social and cultural changes. Operational and strategic managers can use this information when making decisions on where to locate various aspects of their business. In some cases, it may make sense to outsource a particular task, but in other cases an organization may want to offshore particular tasks in order to keep control of the process.

scholarly journals Advances in the Coordination between the Cadastre and Land Registry

Land ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 81
Author(s):  
Carmen Femenia-Ribera ◽  
Gaspar Mora-Navarro ◽  
Jose Carlos Martinez-Llario
Keyword(s):  
General Public ◽  
Current System ◽  
Point Of View ◽  
Preliminary Study ◽  
The Relationship ◽  
The City ◽  
Made In

A necessary and effective coordination between cadastre and land registry has always existed in Spain, but the difficulties have only been specifically addressed in the last few years. The aim of this study is to illustrate, analyse, and evaluate advances in this coordination in Spain from the beginnings of the current system in the early twentieth century, with the cadastre and land registry operating as separate organisations. A preliminary study was made in 2002 of the difficulties that needed to be overcome to achieve an ideal coordination of mainly mapped information. The study was made by gathering and analysing the opinions of various specialists who have dealt with the issue of coordination. For this research, qualitative information (current and historical) was gathered by querying documents about cadastre and land registry coordination in Spain. This information was studied and compared to identify the problems and challenges. A survey in 2012 analysed the relationship between the cadastre and land registry from the point of view of the general public in the city of Gandia. The Spanish government enacted the first specific and effective legislation on coordination in 2015 (Act 13/2015), and much has changed since its introduction. During the last five years of application, each of the problems initially highlighted has been monitored and analysed, and the difficulties that have arisen have been noted. In this study, each of these problems and challenges is analysed from various perspectives: querying documents (norms, budgets, official news, etc.), websites, digital applications, observation, and interviews. The main results of the case study in Spain are as follows: coordination is generally indispensable and cannot be postponed; there is a difficult understanding between the organisations involved; the general public associate the word “cadastre” with taxes and not with security in the demarcation of property; political will and understanding is necessary; the process is slow and requires long-term agreements; an improvement in the quality of maps is fundamental; and technology is not a problem.

Dynamic Stability Identification of a Full-Scale Tainter-Gate and Extension of Gate-Opening Range for Operation

2015 ◽  
Author(s):  
Keiko Anami ◽  
Noriaki Ishii ◽  
Charles W. Knisely
Keyword(s):  
Theoretical Analysis ◽  
Dynamic Stability ◽  
Operating Conditions ◽  
Specific Test ◽  
Term Operation ◽  
Gate Opening ◽  
Long Duration ◽  
Ambient Excitation

To assure the complete stability and long-term safe operation of the large number of Tainter gates used worldwide, an effective method of distinguishing those gates susceptible to instability from unsusceptible gates is essential. This paper presents a case study of the dynamic stability identification of an operational Tainter gate in Japan, based on field vibration testing using steel-rod breaking excitation. First, an overview of the field vibration test and the in-water natural vibration characteristics of the gate is presented. The dynamic stability of the gate was identified from the test results in conjunction with our previously developed theoretical analysis. From the specific test data for a limited number of operating conditions, our theoretical analysis permits assessment of the dynamic stability of the gate for all operating conditions. In particular, the dynamic stability of the gate for small gate openings was confirmed, and subsequently validated by long-duration ambient excitation tests with very small gate openings. This study was the first attempt at operating the gate at openings smaller than the conventional minimum recommended opening. As a result, not only did the field test validate the gate’s reliability for long-term operation, but it also permitted an extension of the gate-opening range for operation.

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