Heat exchangers are an integral part of processes plants: an oil refinery will typically have many exchangers of different designs, ages, and criticalities. Heat exchangers are susceptible to fouling which reduces the efficiency of heat transfer and results in either increased energy/operating costs or reduced output. In addition, they can suffer a number of different degradation mechanisms and failure modes including and tube lockages, corrosion, erosion, and cracking, resulting in leaks in tubes or shells. Depending upon the service, these leaks can be a minor nuisance (e.g. water leaks), or represent a major safety risk (pressurized gas). Such heat exchangers are periodically opened and cleaned to recover their thermal efficiency, at which time any leaking tubes are usually plugged. However such intrusive maintenance can also introduce wear and damage, shortening the life of the tube bundle.
The heat exchanger examined in this study was demonstrating an increased frequency of tube failures (pinhole leaks) and lower performance due to the cumulative number of plugged tubes. So a replacement tube bundle was proposed. The plant engineers also felt that changing from a Copper/Nickel alloy to Titanium material would yield greater reliability and longer bundle life. This study was commissioned to ascertain the business case for re-tubing and to evaluate the life cycle cost benefits of the alternative materials.
The SALVO process provides the structured navigation and evaluation discipline to ensure all factors, stakeholders, and scenarios were explored, quantified, and evaluated on a consistent and auditable basis. This process was supported by real-time cost/risk modeling and ‘what if?’ calculations using the DST Lifespan Evaluator™ tool.
Figure 1 shows the Life Cycle Costs and Risks (in NPV ‘business impact’ ) of the two options for replacement (Titanium and Cu/Ni). The optimal timing for replacement with higher cost Titanium tubes would be in 10 years’ time, whereas the cheaper Cu/Ni option is worth installing in just 8 years. Taking the subsequent (future) life cycles into account also, the total business impact favors the Cu/Ni option, with the earlier replacement point. NB but not as soon as all expected – the renewal had been proposed for the next shutdown opportunity in just 2 years’ time. The SALVO rigor retains total transparency of all the risk, performance, Capex and Opex contributions, so that uncertainties, alternative scenarios, and other ‘what if?’ options were explored in a matter of minutes.
This study involved a small team comprising operations, maintenance, engineering, and commercial staff. It needed just 2 hours to build the ’base case’ scenario, model the risks, costs, and operational options available, and identify the optimal strategy for like-for-like renewal. The team then developed the “replace with Titanium” scenario and explored the optimal timing and whole life cost/risk impact of this option. A formal decision-recording stage captured the optimal strategy, the audit trail for why this represents the best total value, the multi-disciplined team observations and endorsements, and the practical implementation actions.
To perform the complex reliability, risk and financial ’what if?’ calculations, this study used decision-support software called DST Lifespan Evaluator™. This tool was developed as part of the international SALVO project to support the analysis of asset life cycle decisions at both design/selection/procurement stage and in end-of-life decision-making (e.g. refurbish/replace justifications and optimal renewal timing). Like other modules in the DST Asset Strategy Evaluator™ suite, the tool provides:
The study determined the optimal end-of-life strategy for the current tube bundle was to replace it with a like-for-like Cu/Ni design in 8 years’ time. This showed a benefit of NPV £390k compared to renewal at the previously presumed timing (in a shutdown in 2 years’ time). And this strategy was NPV £450k better value (lower life cycle costs and risks) than upgrading to titanium to achieve higher reliability and longer bundle life.
All study team members had been expecting that the increased reliability and life of the Titanium material would be worth its extra cost. But this was proven not to be the case. The team all accepted the outcome, based on the whole life cycle cost/risk/performance and this mind-changing was seen as a major step forward in objective decision-making.
The Woodhouse Partnership would be delighted to show you how the SALVO process and Decision Support Tools can be implemented to benefit your business, contact us now for a free initial consultation. We look forward to hearing from you.
Mutual Energy has been recognised for effective asset management of critical infrastructure by achieving ISO 55001 certification.
David Curtis, Director, Engineering Talent Management at Hydro One talks us through their experience with the Woodhouse Partnership and benefits of refining their asset management practices.
With asset management systems, including risk management, relating to assets with a replacement value of over GBP 40 billion, Scottish Water used SALVO & Decision Support Tools (DST) to make significant savings.
José Luis cuenta con una experiencia exitosa en multi-industrias públicas y privadas, donde desempeñó cargos gerenciales, líder de aplicación técnica especializada, puestos operativos y en mantenimiento, así como en áreas de consultoría sustentando nivel operativo, táctico y estratégico.
Ha formado parte de proyectos de mejoramiento de gestión de activos, confiabilidad operacional, integridad y mantenimiento en Latinoamérica en diferentes empresas creando valor al negocio con resultados técnicos y económicos importantes.
Facilitador e instructor acreditado en temas relacionados con la gestión de activos, mejores prácticas, metodologías de administración gerencial y técnicas especializadas.
Mechanical Engineer with 31 years of experience. Specialist in implementation processes of activities
associated with Asset Management under the ISO 55001 approach, Implementation of diagnostic
programs and audits of management systems, Specialist in applying reliability methodologies such as
Reliability-Centered Maintenance, risk-based inspection, Cause Analysis Root, Life Cycle Cost Analysis,
Condition Based Maintenance, Failure Modes and Effects Analysis, Mechanical Integrity among others.
He has been an Equipment Mechanical Integrity Engineer, an experienced user of traditional NonDestructive Testing such as Ultrasound, Infrared Thermography, Superficial Techniques, Industrial
Radiography.
He has led and participated in countless applications in the field of reliability and condition monitoring,
with special emphasis on the generation and execution of policies and maintenance plans aimed at
achieving the “minimum total business impact” guaranteeing Safety, Hygiene and Environment
standards.
Over his 28 plus year span in the industrial sectors with working technical backgrounds in Project & Construction Management, Asset Operations and Maintenance Reliability Management, and being certified in various courses of study; Damien has gained the knowledge and experience and has had proven successes throughout his tenure in the Oil, Gas, Petro-Chemical and Construction sectors. Establishing his-self in the various sectors, Damien’s first experience and success started in the Construction Sector in estimating engineering. This was the stepping stone for Damien and has paved the way for his passion and continued success in supporting People, Process, and Systems in an organization.
Damien has held positions in local, international and multi-national corporations and comes from a working background in the fields of environmental, operations, project and construction management, operations maintenance and reliability management, planning, supervisory management, and has proven his abilities to succeed in each field.
Rich was an Engineer and Project Manager professional at the New York Power Authority for over 30-years. In addition to being the first Project Manager for the Niagara Project Upgrade, Rich rose to be the Vice President of Engineering having started in Operations Engineering decades earlier. Rich went on to be Vice President, Transmission and Substation at AECOM responsible for hundreds of millions of dollars in design and construction. Rich joined Woodhouse Partnership, North America and participates in aligning organization towards ISO 55000 and many reliability studies supporting DST.
with
Our Asset Management Academy is pleased to announce 2023 dates for our Masterclass – the benchmark for personal development and competency recognition for Asset Management Professionals
Executive in Operational Excellence, Asset Management and Best Practices in Projects, Operations and Maintenance in the Energy and Industrial Sector.
Consultant, Instructor and International Lecturer on issues related to project management (risk management), operational reliability, strategic management of operations, maintenance, Asset Management in the energy sector (ISO 55001) and Applied Data Analytics.
PMP, CMRP, IAM and CAMA certifications, being recognized by the SMRP in 2019 as CMRP of the Year https://smrp.org/2019-CMRP-Winners.
George has over twenty-five years of experience as a consulting engineer providing design, planning, program and project management, and strategic asset management services for asset-intensive organizations in the Americas, Africa, and the Middle East. His primary focus has been in the public infrastructure sector; as a result, he has intimate knowledge of the assets, processes, and resources necessary to deliver and sustain safe, reliable services to the customers of public asset-owning organizations.
George has assisted organizations with the development of PAS 55, ISO 55000, and GFMAM AM Landscape aligned asset management systems (AMS), has performed gap analyses of their AMS against industry standards and best practices, and has guided them through the creation of strategic asset management plans (SAMPs), asset management plans (AMPs), AM policy and supporting documents. He has undertaken asset risk modelling to ascertain organizations’ capability to sustain their desired levels of service. George has performed asset health-informed lifecycle cost modelling and forecasting capital and operational expenditures over near and long-term planning horizons.
With 30 years’ experience in utilities, oil & gas, transport and other sectors, John is one of the most widely known experts in integrated asset management projects for some of the largest companies in the world.
John is a Founder and Life Fellow of the IAM; he has written 4 books, chaired the development of BSI PAS55 and represents the UK on the ISO55000 committee.
He also led the international MACRO and SALVO collaboration projects in optimised asset management decision-making.
